Cut off Wavelength 980, 1350 nm; Numerical Aperture 0.09 to 0.27; Core Dia. 3.5 to 14 µm; Cladding Dia. 125 µm; Background Loss <10 to <30 dB/km FORC-Photonics’ series of Bismuth-doped single mode (SM) optical fibers feature core diameters of 5.6 and 6.5 µm. The Bismuth-Phosphorus co-doped fiber BPDF-SM-6/125-1320 is specially designed for amplifiers, lasers or superfluorescent fiber sources operating at 1270 to 1370 nm, while the Bismuth-Germanium co-doped fiber BGDF-SM-7/125-1430 series is specially designed for amplifiers, lasers or superfluorescent fiber sources operating at 1370 to 1490nm. Key Features: Bismuth-doped Fibers Phosphorus or Germanium Co-doped Core Diameter: 5.6, 6.5 µm Core Absorption: 0.3, 0.5 dB/m Cladding Diameter: 125 µm Cut off Wavelength: 1050, 1100 nm Core Numerical Aperture: 0.14 Typ. Peak Gain: >0.2 dB/m Applications: Amplifiers; Lasers; Superfluorescent Fiber Sources

Cut off Wavelength 980, 1350 nm; Numerical Aperture 0.09 to 0.27; Core Dia. 3.5 to 14 µm; Cladding Dia. 125 µm; Background Loss <10 to <30 dB/km FORC-Photonics’ series of Erbium-doped single mode (SM) optical fibers feature core diameters from 3.5 to 14 µm. The EDF-4/125-10 fiber is specially designed to achieve the highest efficiency of telecommunication amplifiers, while the Erbium-doped fiber EDF-4/125-25 is designed to minimize the amplifier length without degradation of the pump-to-signal conversion efficiency. FORC-Photonics’ Erbium-doped fiber EDF-4/125-50 is designed for amplification of ultra-short pulses, when high efficiency, a short amplifier length and a high negative dispersion (-30 to -50 ps/nm/km) are required, while the EDF-14/125-35 Erbium-doped fiber is designed for low-nonlinearity and high pulse energy amplifiers. Key Features: Erbium-doped Fibers Core Diameter: 3.5 to 14 µm Core Absorption: 6 to 50 dB/m Cladding Diameter: 125 µm Cut off Wavelength: 980, 1350 nm Core Numerical Aperture: 0.09 to 0.27 Background Loss: <10 to <30 dB/km Applications: High Efficiency Telecommunication Amplifiers; Amplification of Ultra-short Pulses; Low-nonlinearity, High Pulse Energy Amplifiers

Cut off Wavelength 700, 1400 nm; Core Dia. 2.2, 8x7 µm; Cladding Dia. 125 µm; GeO2 Concentration 75, 98% FORC-Photonics’ GDF series of Germanate glass core optical fibers is available for single mode (SM) or multi mode (MM) applications. GDF series fibers feature core diameters of 2.2 µm (round, GDF-SM-2.2/125-75) and 8x7 µm (elliptical, GDF-MM-8/125-98). The GDF-SM-2.2/125-75 single mode version is a higly Ge-doped silica Germanate glass core fiber used for a variety of nonlinear applications. The GDF-MM-8/125-98 multi mode version is a Germanate glass core fiber, also used for a variety of nonlinear applications. Key Features: Germanium-doped Fibers Germanate Glass Core, GeO2 Concentration: 75, 98% Core Diameter: 2.2 µm, 8x7 µm (elliptical) Cladding Diameter: 125 µm Coating Diameter (GDF-MM-8/125-98): 250 µm Cut off Wavelength: 700, 1400 nm Minimum Loss (GDF-SM-2.2/125-75): 20 dB/km Attenuation (GDF-MM-8/125-98): 110, 200 dB/km Typ. Peak Gain: >0.2 dB/m

Cut off Wavelength 1000, 1500 nm; Numerical Aperture 0.3; Core Dia. 3, 4,5 µm; Cladding Dia. 125 µm; Optical Loss <5 dB/km FORC-Photonics’ series of Germanium-doped high non-linear single mode fibers feature core diameters of 3 and 4.5 µm. HNLF fibers are designed to maximize fiber nonlinearity and minimize optical loss, which makes such fibers optimal for constructing highly efficient Raman lasers and amplifiers, dispersion compensators and various non-linear devices. The HNLF DS fibers with shifted dispersion are designed for applications requiring a shift of the zero dispersion wavelength to the 1550 nm spectral region: supercontinuum generation, parametric conversion, etc. Other parameters including core and PM versions are available on the request. Key Features: Germanium-doped Fibers Core Diameter: 3, 4.5 µm Cladding Diameter: 125 µm Cut off Wavelength: 1000, 1500 nm Core Numerical Aperture: 0.3 Optical Loss: <5 dB/km Applications: Amplifiers; Lasers; Superfluorescent Fiber Sources

Wavelength 600-2300 nm; Bandwidth 0.05-1.2 nm; Reflectivity 5-99%; SLSR >8 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) are sensitive to changes in temperature, their thermal sensitivity is about 6.7 ppm/K (+0.11 pm/K @1550 nm). FORC Photonics’ GTL-FBG-AP-850 athermal packaged fiber Bragg gratings are intended for passive compensation of the FBG’s thermal sensitivity by matching the case elements’ expansion with the FBG’s wavelength shift under the influence of temperature. This technology allows customers to achieve all advantages of fiber Bragg gratings, while preserving a high wavelength stability within a wide temperature range. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized athermal packaged fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 600 nm to 2300 nm Wavelengths to Quick Order [nm]: 633, 780, 794, 797, 799, 801, 809, 830, 852, 895, 940, 976, 1030, 1057, 1060, 1064, 1080, 1125, 1150, 1178, 1240, 1270, 1310, 1484,1510 ÷ 1580, 1650, 1900, 1908, 1952, 2300 Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Thermal Wavelength Stability (0°C to +70°C): <0.16 nm Reflectivity: 5% to 99% Bandwidth (WFHM): 0.05 nm to 1.2 nm FBG Length: 1 mm to 20 mm SLSR: ~8 dB FBG Pigtail Length: ≥0.5 m Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions: 66 x 18 x 12 mm Applications: Passive Compensation of FBG Thermal Sensitivity; Applications Requiring High Wavelength Stability in a Wide Temperature Range

Wavelength 1000-2300 nm; Bandwidth 0.05-1 nm; Reflectivity 0.01-95%; SLSR ~8 dB; Fiber Type SM, PM, Double Clad, LMA, Radiation Resistant, Custom; Fiber Pigtail Length ≥0.5, Custom FORC Photonics’ GTL-FBG-FS-880 type femtosecond fiber Bragg gratings (FBGs) can be written into all optical transparent fiber materials with a broad variety of fiber coatings – without the need to strip the coating from the fiber and recoating it after the FBG writing procedure. Optical sensors based on femtosecond FBGs allow to monitor temperature, pressure, and deformation of such objects that previously hadn`t been eligible for sensing. FBGs written into radiation resistant pure silica core fibers are ideal for applications in the nuclear industry. Femtosecond FBG inscription through the fiber’s protective coating yields excellent mechanical strength – very important in strain sensing applications. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized femtosecond fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 1000 nm to 2300 nm Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Radiation Resistant, Custom Reflectivity: 0.01% to 95% Bandwidth (WFHM): 0.05 nm to 1 nm SLSR: ~8 dB FBG Pigtail Length: ≥0.5 m FBG Inscription Through the Fiber’s Protective Coating: Acrylate, Polyimide, Custom Additional FBG Coating (on Request): Aluminium, Copper, Custom Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Applications: Monitoring Temperature, Pressure & Deformation; Nuclear Industry

Wavelength 600-2300 nm; Bandwidth 0.05-1.2 nm; Reflectivity 5-99%; SLSR >8 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom FORC Photonics’ GTL-FBG-TB-890 tunable fiber Bragg gratings (FBGs) are a good solution for many applications – including those requiring a corrected central Bragg wavelength. An FBG’s central wavelength strongly depends on applied stress, with the mechanically induced strain linearly shifting the FBG’s central wavelength. The tunable fiber Bragg grating wavelength’s relative strain sensitivity is 0.78 * 10-6 µstrain-1. GTL-FBG-TB-890 tunable fiber Bragg gratings are boxed and operated manually. Athermal performance with an adjustment range of 2 nm is also possible. The gratings are available as bare fibers or with a variety of optical connectors. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized tunable fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 600 nm to 2300 nm Wavelengths to Quick Order [nm]: 633, 780, 794, 797, 799, 801, 809, 830, 852, 895, 940, 976, 1030, 1057, 1060, 1064, 1080, 1125, 1150, 1178, 1240, 1270, 1310, 1484,1510 - 1580, 1650, 1900, 1908, 1952, 2300 Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Thermal Wavelength Stability (0°C to +60°C): <0.18 nm Reflectivity: 5% to 99% Bandwidth (WFHM): 0.05 nm to 1.2 nm FBG Length: 1 mm to 20 mm Adjustment Range: 2 nm SLSR: >8 dB FBG Pigtail Length: ≥0.5 m FBG Recoating: On Customer Request Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions: 66 x 18 x 16 mm Applications: Where Corrected Central Bragg Wavelength is Necessary

Cut off Wavelength 650, 1000 nm; Mode Field Dia. 2.0, 4.3 µm; Zero-dispersion Wavelength 800 to 1000 nm; Optical Loss <30, <100 dB/km FORC-Photonics’ HN-PCF series is a new type of fibers, so-called micro-structured or photonic crystal fibers. This type of fibers features holes or inclusions of a material with different refractive index in the core and/or in the cladding. New dispersion and nonlinear properties can be observed in photonic crystal fibers. Most of the specific applications for micro-structured fibers require their own specific structure of the fiber. FORC-Photonics has the capabilities to design and fabricate a broad variety of fiber structures according to customer orders. Other parameters are available on the request. The HN-PCF-800 fiber is specially designed for supercontinuum generation using Ti-sapphire ultra-fast femtosecond lasers, while the HN-PCF-1040 fiber is specially designed for supercontinuum generation using Yb-doped picosecond or femtosecond ultra-fast fiber lasers. Key Features: Mode Field Diameter: 2.0, 4.3 µm Zero-dispersion Wavelength: 800 to 1000 nm Nonlinear Coefficient: 10, 90 1/W*km Optical Loss: <30, <100 dB/km Cut off Wavelength: 650, 1000 nm Applications: Supercontinuum Generating Using Ti-sapphire or Yb-doped Ultra-fast Lasers

Cut off Wavelength 900 nm; Numerical Aperture 0.17, 0.18; Core Dia. 5 µm; Cladding Dia. 125 µm; Raman Gain >5.0, >5.8 dB/km*W FORC-Photonics’ PDF-5/125 series of Phosphorus-doped single mode (SM) optical fibers is specially designed for highly efficient Raman lasers and amplifiers operating in the 1100 to 1600 nm spectral range. The main advantage of phosphorus-doped fiber is a three times higher value of the Raman shift as compared to germanium-doped fibers. This feature allows to strongly simplify the Raman fiber laser and amplifier design. For example, to construct a high-power laser @ 1480 nm required for pumping Er-doped fibers, only two cascades of Raman wavelength transformation are necessary, whereas six cascades are necessary in the case of Ge-doped fibers. FORC-Photonics’ PDF-5/125PM series of Phosphorus-doped polarization maintaining (PM) optical fibers is specially designed with the ability to maintain polarization. Key Features: Phosphorus-doped Fibers Core Diameter: 5 µm Cladding Diameter: 125 µm Cut off Wavelength: 900 nm Core Numerical Aperture: 0.17, 0.18 (PDF-5/125PM) Raman Gain: >5.0, >5.8 (PDF-5/125-P) dB/km*W Optical Loss: <1 to <20 dB/km Applications: Highly Efficient Raman Lasers and Amplifiers

Numerical Aperture 0.09; Core Dia. 20 µm; Cladding Dia. 127 µm; Gray Loss <20 dB/km; Polarization Extinction Ratio >20 dB FORC-Photonics’ SBS-DC series of SBS-suppressed optical fibers feature a suppressed stimulated Brillouin scattering gain. Stimulated Brillouin scattering (SBS) is the major factor limiting maximal power of narrow-band fiber lasers (less than 100 MHz linewidth). It is especially crucial in applications which require small mode field diameter (MFD), i.e. Raman amplifiers. Suppression of SBS gain, while maintaining MFD (and Raman gain) becomes a very important task in such fibers. Another promising application of single-frequency lasers is LIDAR (Light Detection And Ranging). In the case of all-fiber systems, it is the passive fibers at the amplifier output (pigtails of isolators, circulators, collimators) that limit the maximum achievable peak power. Thus, development of large mode area (LMA) passive fibers with increased SBS threshold (as compared to standard LMA fibers) is more and more critical for those applications. To suppress SBS gain for a fixed MFD, FORC-Photonics uses a specially designed multi-layer, multi-components doped core. It allows to suppress SBS gain by 3 to 5 dB relative to standard, uniformly doped Ge-doped passive fibers with the same MFD. The developed method allows FORC-Photonics to design custom dopants distribution over the core to suppress SBS by 3 to 5 dB for most of the actual optical refractive index profiles (any core numerical aperture and diameter). The SBS-DC-20/125-1550PM polarization maintaining (PM) fiber has been specially designed to be used in pigtails of output components (isolators, collimators, pump-and-signal combiners etc.) of high peak-power single-frequency lasers operated near 1550 nm. The fiber is intended for utilization in systems with the ability to maintain polarization. Fibers with suppressed SBS-gain for a custom designed operating wavelength, core numerical aperture (NA) and diameter are available on request. Please contact AMS Technologies to discuss your customized SBS-suppressed optical fiber solution. Key Features: Suppressed Stimulated Brillouin Scattering (SBS) Gain Core Diameter: 20 µm Cladding Diameter: 127 µm Core Numerical Aperture: 0.09 Gray Loss: <20 dB/km Polarization Extinction Ratio (After 2 m): >20 dB Applications: Narrow-band Fiber Lasers; Raman Amplifiers; Pigtails of Output Components (Isolators, Collimators, Pump-and-signal Combiners etc.) of High Peak-power Single-frequency Lasers

Wavelength 600-2300 nm; Bandwidth 0.1-1.2 nm; Reflectivity 0.5-99.9%; SLSR ~8, ~10 dB; Fiber Type SM, PM, Double Clad, LMA, Radiation Resistant, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) have many applications in optical communication, laser technique and sensing systems. FORC Photonics’ series of specific application FBGs are widely used for applications like in-fiber mirrors or optical filters with narrowband optical spectrum. Fiber Bragg gratings also are one of the most popular elements in the field of fiber-optic sensing. Within FORC Photonics’ series of specific application fiber Bragg gratings (FBG) you find: Wavelength Locker FBGs WDM ITU Filter 100/200 GHz FBGs Raman Laser FBGs Fabry-Perot Interferometer FBGs Hard Environment FBGs Radiation Hard FBGs GTL-FBG-WL-810 wavelength locker fiber Bragg gratings are used as external reflectors for laser diodes. With the help of these FBGs it is easy to stabilize the wavelength generation of pump semiconductor lasers and single-frequency lasers. Low-reflection gratings with a full width at half maximum (FWHM) bandwidth of 0.3 nm to 0.8 nm and a reflectivity of 2% to 5 % are ideal for stabilizing pump power lasers. FBGs with FWHM bandwidths around 0.1 nm and reflections of 10% to 20% are used close to semiconductor laser crystals for creation of single-frequency sources. FORC Photonics provides wavelength locker FBGs with very accurate wavelength positions (up to ±0.02 nm). FORC Photonics’ GTL-FBG-WDM-810 series of WDM ITU Filter 100/200 GHz fiber Bragg gratings with narrow spectral bandwidth are good elements for filtering optical signals. Such FBGs are widely used as optical add/drop multiplexer in WDM systems. A high level of SLSR is allowed to avoid adjacent channel crosstalk in systems. These FBGs feature a flat-top reflection spectrum and steep spectral roll-down. Athermal packaging of the FBG with wavelength stability <0.16 nm for a temperature range of 0°C to +70⁰C is required for stable operation. Highly efficient multi-cascaded Raman lasers based on phosphosilicate fibers can be created at different wavelength using our GTL-FBG-RL-880 Raman laser fiber Bragg gratings. Compared to Germanium-doped fibers, an approximately three times larger Raman shift can be achieved. For many applications where very small temperature or strain changes have to be measured using acoustic waves, the sensitivity can be enhanced by using pairs of FBGs. A Fabry-Perot interferometer based on FORC Photonics’ GTL-FBG-FPI-810 Fabry-Perot interferometer fiber Bragg gratings is such a pair of FBGs, allowing to detect a small phase shift. By coating the fiber between the gratings with an electric, magnetic or acoustic enhancing coating, very small changes of these fields can be measured. For sensing purposes and to evaluate small vibration or acoustic signals via an interferometric method, it is often sufficient to work with a low-finesse Fabry-Perot cavity. GTL-FBG-HE-810 hard environment fiber Bragg gratings can be provided as separated or chains of FBGs with different wavelengths, allowing for multipoint temperature monitoring. Different types of single mode (SM) optical fibers and fiber coatings can be used for writing these gratings. High-temperature acrylate coated fibers apply for temperature ranges up to +150°C. Polyimide or metal (Cu, Al) coated fibers are used for high-temperature applications with maximum temperatures of +300°C and +500°C respectively. Using a steel tube protection, our hard environment FBGs can be applied up to +700°C. GTL-FBG-RH-880 radiation hard fiber Bragg gratings written in radiation resistant pure silica core fibers are ideal for applications in the atomic energy industry, aerospace and other radiation intense environments. Key Features:The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss an application-specific, customized fiber Bragg grating solution tailored to your project’s requirements.   GTL-FBG-WL-810 Wavelength Locker FBGs GTL-FBG-WDM-810 WDM ITU Filter 100/200 GHz FBGs GTL-FBG-RL-880 Raman Laser FBGs GTL-FBG-FPI-810 Fabry-Perot Interferometer FBGs GTL-FBG-HE-810 Hard Environment FBGs GTL-FBG-RH-880 Radiation Hard FBGs Wavelength Range [nm] 630 - 2300 1530 - 1565 (C Bands) or Custom 1510 - 1580 1240, 1270, 1484 600 - 2300 1000 - 2300 Wavelengths to Quick Order [nm] 30 values between 633 and 2300 - - - 30 values between 633 and 2300 - Fiber Type Single Mode (SM), Polarization Maintaining (PM), Custom Single Mode (SM) Corning SMF-28 Single Mode (SM), Polarization Maintaining (PM), Double-clad, LMA, Custom Single Mode (SM), Polarization Maintaining (PM), Radiation Resistant, Custom Single Mode (SM), Polarization Maintaining (PM), Double-clad, LMA, Custom Single Mode (SM), Polarization Maintaining (PM), Radiation Resistant, Custom Reflectivity [%] 2 - 5, 10 - 20 10 - 99, Flat-top Typical > 99.5 5 - 99.9 0.5 - 99 Bandwidth (WFHM) [nm] 0.3 - 0.8, 0.1 - 0.15 100/200 GHz on ITU For 100 GHz: @-0.5 dB >0.3 nm, @-20 dB 0.65 nm 0.15 - 1.2 0.3 - 0.8 0.15 - 0.8 0.3 - 0.5 Distance Between FBGs [mm] - - - 1 - 200, Custom - - Channel Isolation [dB] - -20 - - - - Insertion Loss [dB] - <0.15 - - - - Cladding Mode Loss [dB] - <0.5 (Only for Cladding Mode Suppressed Fiber) - - - - SLSR [dB] ~10 - ~8 - ~8 ~8 FBG Pigtail Length [m] ≥0.5, Custom FBG Recoating None, Acrylate, Polyimide, Aluminium, Copper, Custom None, Acrylate, Polyimide, Custom None, Acrylate, Polyimide, Aluminium, Copper, Custom Tensile Strength [kpsi] >100 - >100 Thermal Wavelength Stability (0°C - +70°C) [nm] - <0.16 - - - - Optical Connector Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions LxWxH [mm] - 66 x 18 x 12 - - - -   Applications: External Reflectors for Laser Diodes; Filtering Optical Signals; Optical Add/Drop Multiplexer in WDM Systems; Measuring Small Temperature or Strain Changes; Evaluating Small Vibration or Acoustic Signals; Multi-cascaded Raman Lasers; High-temperature Applications; Atomic Energy Industry; Aerospace    

Wavelength 600-2300 nm; Bandwidth 0.05-50 nm; Reflectivity 0.2-99.9%; SLSR ~8->15 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) have many applications in optical communication, laser technique and sensing systems. FORC Photonics’ series of standard types FBGs are widely used for applications like in-fiber mirrors or optical filters with narrowband optical spectrum and can act as a sensor element for strain and temperature measuring. Within FORC Photonics’ series of standard types fiber Bragg gratings (FBG) you find: Uniform Fiber Bragg Gratings Apodized Fiber Bragg Gratings Chirped Fiber Bragg Gratings Apodized-chirped Fiber Bragg Gratings Fiber Laser Matched Fiber Bragg Gratings Tilted Fiber Bragg Gratings π-Phase-Shifted Fiber Bragg Gratings GTL-FBG-UF-810 uniform fiber Bragg gratings are produced with grating lengths from 0.5 mm to 10 mm. Such gratings show their full width at half maximum (FWHM) from 0.015 nm (R = 25%) to 0.03 nm (R = 90%) for 633 nm wavelength (0.1 nm and 0.17 nm at 1580 nm) and gratings length 9 mm. Standard uniform FBGs have a bandwidth of 0.15 nm to 0.6 nm, a reflectivity of 5% to 99% and grating lengths of 1 mm to 3.5 mm. Fiber Bragg gratings are sensitive to changes of strain and temperature. Uniform FBGs can be provided as separated units or chains of FBGs with different wavelengths. By using chain FBGs, multipoint monitoring of temperature, strain or other physical parameters is available. Different types of single mode optical fibers and fiber coatings are used. Acrylate coated fibers for normal temperature range of -40˚C to +100˚C. Polyimide or metal (Cu, Al) coated fibers are used for high-temperature applications with maximum temperatures of +300˚C and +500˚C respectively. GTL-FBG-AD-820 apodized fiber Bragg gratings show a special profile of induced refractive index and grating strength along the grating length. Therefore, the side lobes level becomes smaller compared to ordinary gratings. There are a lot of apodized profiles which lead to the optimization of various FBG parameters (strength, FWHM, side lobe suppression ratio (SLSR)). Apodized FBGs are useful in sensing applications, signal and Brillouin scatter filtering and others. Possible value of SLSR for different grating strengths is -10 dB to -30 dB. Our GTL-FBG-CR-840 chirped fiber Bragg gratings feature a linear variation of the FBG period along the grating length. Chirped FBGs are manufactured by using a non-periodic phase mask. The available chirp rate of the phase mask period can range from 0.01 nm/cm to 30 nm/cm. Therefore, such FBGs have a wide spectrum bandwidth and special dispersion characteristics. Chirped FBGs are useful for gain-flattening EDFA and ASE light sources, band stop filters, in ultrafast mode-locked fiber lasers, powerful lasers, and chromatic dispersion compensation telecom systems. Apodization of chirped FBG is necessary to obtain FBGs with a smooth reflection spectrum. There are several apodization profiles that lead to the optimization of various parameters of the FBG such as reflection coefficient, FWDM, side lobe suppression ratio (SLSR), or the parameter of dispersion. In chirped FBGs the dispersion is determined by the rate of change of the period along the length of the FBG. Within the GTL-FBG-ADG-820 series of apodized-chirped fiber Bragg gratings, FORC Photonics has implemented several types of apodization profiles: Sine, Gauss, Semi Gauss and Super Gauss. The simplest type of apodization is "Sine", which "saves" the length of the FBG and provides a (SLSR) value of about 20 dB. The "Gauss" apodization function provides the best SLSR value in the order of 30 dB. For many applications, such as pulsed fiber lasers, there are special requirements for the dispersion value and the shape of the reflection profile. "Gauss" apodization of chirped FBGs allows to obtain excellent results in these applications. The "SuperGauss" type of apodization is intended for obtaining a flat-top reflection spectrum. Apodized FBGs are useful in sensing applications, signal and Brillouin scatter filtering and others. Our GTL-FBG-LP-830 fiber laser matched FBG pairs are an ideal solution for fiber laser fabrication. Minimum insertion losses and other parameters are optimal for lasers with output powers of several tens of W. High- and low-reflection gratings are available, with the high-reflection grating showing -20 dB levels of about 0.5 nm to 0.7 nm. The low-reflection output grating with 5% to 40% reflectivity has FWHM values of 0.15 nm to 0.35nm. The mismatching of LR relative to HR grating is up to ±0.15 nm. For narrow-line fiber lasers we provide FBG pairs with FWHM values around or below 0.1 nm for ideal matching without adjustment. GTL-FBG-TL-860 tilted fiber Bragg gratings have an angle between the wave vector of the grating and the fiber axis. Therefore, cladding modes resonance peaks become more intensive compared to ordinary gratings. The wavelengths of tilted fiber Bragg gratings cladding modes resonances are highly sensitive to the refractive index of the medium outside the fiber cladding. TFBGs are useful in sensing applications. Possible values of the tilt angle are 1⁰ to 45⁰. GTL-FBG-PS-870 π-phase-shifted fiber Bragg gratings have a very narrow peak within their transmission/reflection spectrum. Phase-shifted FBGs are gratings with a phase defect in the center. While the grating length determines its bandwidth, the spectral width of that peak depends on the strength of the FBG’s both parts. Typical FWHM values for our π-phase-shifted fiber Bragg gratings are 0.1 nm to 0.005 nm. A typical application of phase-shifted FBGs are narrow-bandwidth optical filters for single-frequency fiber lasers. Key Features:The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized fiber Bragg grating solution tailored to your project’s requirements.   GTL-FBG-UF-810 Uniform FBGs GTL-FBG-AD-820 Apodized FBGs GTL-FBG-CR-840 Chirped FBGs GTL-FBG-ADG-820 Apodized-chirped FBGs GTL-FBG-LP-830 Fiber Laser Matched FBG Pairs GTL-FBG-TL-860 Tilted FBGs GTL-FBG-PS-870 π-phase-shifted FBGs Wavelength Range [nm] 600 - 2300 Wavelengths to Quick Order [nm] - - 1069, 1081, 1529, 1875 30 values between 633 and 2300 Fiber Type Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom SM, PM, Double Clad, Custom Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Reflectivity [%] 0.2 - 99.9 0.5 - 99.9 5 - 99 5 - >99 5 - 99 Tilt Angle - - - - - 1° - 45° - Chirp Rate [nm/cm] - - 0.01 - 30 0.01 - 25 - - - Bandwidth (WFHM) [nm] 0.05 - 1.2 0.1 - 1.2 2 - 50 0.5 - 50 0.1 - 1.2 0.1 - 0.8 Grating (FBG) Length [mm] - - 2 - 50 - - - - SLSR [dB] ~8 >10, >15 ~8 >15 - ~8 FBG Pigtail Length [m] ≥0.5, Custom - ≥0.5, Custom FBG Recoating None, Acrylate, Polyimide, Aluminium, Copper, Custom None, Acrylate, Polyimide, Custom None, Low- or High-index Polymer, Acrylate, Polyimide, Custom None, Acrylate, Polyimide, Aluminium, Copper, Custom Tensile Strength [kpsi] >100 - >100 Optical Connector Bare Fiber, FC/APC, LC/APC, Custom - Bare Fiber, Custom Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions LxWxH [mm] - - - - 25 x 10 x 6.0 - -   Applications: In-fiber Mirrors; Narrowband Optical Filters; (Multipoint) Strain & Temperature Sensing; Signal and Brillouin Scatter Filtering; Gain-flattening EDFAs; ASE Light Sources; Band Stop Filters; Pulsed, Ultrafast Mode-locked & Single-frequency Fiber Lasers; Powerful Lasers; Chromatic Dispersion Compensation Telecom Systems; Other  

Cut off Wavelength 1900 nm; Core Dia. 10 µm; Cladding Dia. 125 µm; Core Absorption >60 dB/m FORC-Photonics’ TDF-SM-10/125 Thulium-doped single mode (SM) optical fiber is specially designed for highly efficient core pumping at 1550 to 1600 nm. Key Features: Thulium-doped Fiber Core Diameter: 10 µm Core Absorption: >60 dB/m Cladding Diameter: 125 µm Cut off Wavelength: 1900 nm Application: Highly Efficient Core Pumping at 1550 to 1600 nm

Cut off Wavelength 2600 nm; Numerical Aperture Clad 0.44; Core Dia. 11.5 µm; Cladding Dia. 125 µm FORC-Photonics’ TYDF-DC-10/125 Thulium-Ytterbium co-doped optical fiber is specially designed for highly efficient pumping with multi mode (MM) pump sources at 915/975 nm. Pumping with conventional sources near 790 nm is also possible, as well as core pumping with EDFL operating at 1550 to 1600nm. Key Features: Thulium-Ytterbium Co-doped Fiber Core Diameter: 11.5 µm Clad Absorption: >3.5, >5 dB/m Cladding Diameter: 125 µm Cut off Wavelength: 2600 nm Clad Numerical Aperture: 0.44 Application: Highly Efficient Pumping With Multi Mode (MM) Pump Sources at 915/075 nm

Cut off Wavelength 800 to 1030 nm; Numerical Aperture 0.09 to >0.46; Core Dia. 5.5 to 10.0 µm; Cladding Dia. 90 to 400 µm FORC-Photonics’ series of photodarkening-free Yb-doped specialty optical fibers includes single mode (SM) and polarization maintaining (PM) fibers as well as variants with double cladding, large mode areas or tapered fibers. The YDF-SM-6/125 series of single mode Ytterbium-doped fiber is designed for operation without power degradation in core-pumped laser and amplifier schemes, while the YDF-DC-6/125 series of single mode Ytterbium-doped double clad fiber is specially designed for highly efficient high-reliability CW lasers operating in the 1030 to 1080 nm spectral range. Flat absorption in the range of 910 to 965 nm and specially designed polymer coating allow the usage of lasers based on such fibers in an extra wide temperature range (-60 to +60 °C). The YDF-DC-10/125 series of single mode Ytterbium-doped double clad fiber is designed for operation without any power degradation in high-peak-power cladding-pumped amplifiers. The highest clad absorption in the market allows usage of only 3 m of such fiber (with 976 nm pump) for efficient amplification. For all three fiber series (YDF-SM-6/125, YDF-DC-6/125, YDF-DC-10/125), variants with custom parameters including PM versions are available on request. FORC-Photonics’ YDF-DC-40/400-PM-TPR series of Ytterbium-doped tapered fibers is designed for operation without any power degradation in extremely high-peak-power cladding-pumped amplifiers. The tapered fiber design has a single mode end (typical dimension is 8/80 μm) for signal input and a very large mode area (LMA) end (typical dimension is 40/400 μm) for signal output and pump input. The YDF-DC-40/400-PM-TPR series’ all-glass, double-clad fiber design (based on highly F-doped second cladding with typical NA = 0.26) allows simple polishing of the thick 400 μm fiber end. Due to a high Yb concentration and a short tapered fiber length, amplifiers based on this fiber have the highest threshold of nonlinear effects on the market (up to 0.5 MW) together with very high, diffraction-limited beam quality at the output. Key Features: Ytterbium-doped Fibers Photodarkening-free Single and Double Clad Versions Core Diameter: 5.5 to 9 µm (Taper >40 µm) Cladding Diameter: 90 to 127 µm (Taper 400 µm) Cut off Wavelength: 800 to 1030 nm Core Numerical Aperture: 0.09, 0.16 Cladding Numerical Aperture: >0.26, 0.44, >0.46 Applications: Core-pumped Laser and Amplifier Schemes; Highly Efficient High-reliability CW Lasers; High-peak-power Cladding-pumped Amplifiers