SPAD Single-Photon InGaAs/InP Avalanche Photodiodes APD

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, CustomFiber Bragg gratings (FBGs) have many applications in optical communication, laser technique and sensing systems. Greitlex 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 Greitlex Photonics’ series of standard types fiber Bragg gratings (FBG) you find:Uniform Fiber Bragg GratingsApodized Fiber Bragg GratingsChirped Fiber Bragg GratingsApodized-chirped Fiber Bragg GratingsFiber Laser Matched Fiber Bragg GratingsTilted Fiber Bragg Gratingsπ-Phase-Shifted Fiber Bragg GratingsGTL-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.All these FBGs replace similar products from former FORC Photonics. 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 

GH Optics introduces its advanced LWIR Ge-free Optical Windows, a cutting-edge solution designed for long-wave infrared (LWIR) applications in the 8–12 μm spectral range. Engineered using proprietary chalcogenide glass substrates from the GHW series, these windows offer a high-performance alternative to traditional germanium optics. By eliminating the need for germanium, GH Optics delivers a cost-effective, lightweight, and thermally stable solution without compromising on optical quality.These optical windows are enhanced with either DLC (diamond-like carbon) or HD (hard film) coatings, combined with AR (anti-reflection) layers, achieving transmittance rates exceeding 94%. This makes them ideal for demanding infrared systems where clarity, durability, and cost-efficiency are paramount.Product ParametersSubstrate MaterialGe-free Chalcogenide glass GHWDiameter Tolerance+/- 0.1 mmThickness Tolerance+/- 0.1 mmParallelism≤ 3 arcminChamfer0.2 mm x 45°Surface Quality60/40-80/50Flatness< 5 fringesCoatingDLC/AR or HD/ARKey FeaturesGermanium-Free Design: Utilizes GH Optics’ proprietary GHW chalcogenide glass, eliminating reliance on expensive and supply-sensitive germanium.High Transmittance: Achieves >94% transmittance in the LWIR band (8–12 μm), ensuring superior signal fidelity for infrared imaging and sensing.Advanced Coating Technology: Available with DLC or HD coatings plus AR layers, providing excellent scratch resistance, environmental durability, and minimized reflection losses.Thermal and Mechanical Stability: Offers robust performance across varying environmental conditions, making it suitable for field-deployed systems.Cost Optimization: Reduces overall system costs while maintaining high optical performance, ideal for scalable industrial and research applications.ApplicationsLWIR Ge-free Optical Windows are optimized for a wide range of infrared technologies, including:Infrared Thermal Imaging: Enhances image clarity and system reliability in surveillance, automotive night vision, and industrial inspection.Photoelectric Detection Systems: Improves sensitivity and accuracy in scientific instrumentation and remote sensing.Environmental Monitoring: Suitable for gas detection and spectroscopic analysis in harsh environments.Defense and Aerospace: Offers lightweight, durable optics for UAVs, targeting systems, and infrared countermeasures.Medical and Industrial Diagnostics: Enables precise thermal profiling and non-invasive diagnostics.What's Next?GH Optics continues to innovate in the field of infrared optics, expanding its portfolio of germanium-free solutions to meet the evolving demands of global industries. The LWIR Ge-free Optical Windows represent a significant step forward in sustainable, high-performance infrared technology.For researchers, engineers, and procurement specialists seeking reliable, cost-effective alternatives to germanium optics, GH Optics provides a compelling solution backed by deep expertise and rigorous quality standards.Contact our sales team today to request a quote, discuss customization options, or learn more about how LWIR Ge-free Optical Windows can enhance your infrared systems.

1-8 Channels; Max. Sensor Length/Channel 20m (Standard), 50 m (Extended); Measurement Points/m 384 (100 m Sensors), 1,538 (up to 20 m Sensors); Measurement Rate 2.5-250 Hz; Strain Measurement Range ±15,000 µɛ; Temperature Measurement Range -40 to 200 °C; Ethernet Data InterfaceThe ODiSI 7100 Series by Luna Innovations represents a breakthrough in high-definition fiber optic sensing, engineered to meet the rigorous demands of modern materials testing and structural monitoring. Designed for researchers, engineers, and industrial users, this advanced system delivers unparalleled spatial resolution and real-time data acquisition for strain and temperature measurements. With the ability to capture thousands of data points per meter, the ODiSI 7100 enables comprehensive insight into the behavior of materials and systems under dynamic conditions.Unlike traditional point sensors, the ODiSI 7100 leverages distributed sensing technology to provide continuous measurement along the entire length of a fiber optic sensor. This capability is critical for applications requiring high fidelity model validation, process optimization, and structural health monitoring. The system’s passive, dielectric sensors are corrosion-resistant and immune to electromagnetic interference, making them ideal for deployment in challenging environments, including embedded installations and sharply curved surfaces.Key FeaturesThe ODiSI 7100 Series sets a new standard in distributed fiber optic sensing with the following key features:High-definition distributed sensing: Achieve sub-millimeter gage pitch with up to 1,538 measurements per meter, enabling detailed strain and temperature mapping.Multichannel architecture: Supports up to 8 channels, each capable of handling up to 100 meters of sensing fiber, allowing for scalable and flexible deployment.Real-time data acquisition: Provides immediate feedback from demanding environments, facilitating rapid decision-making and process control.Robust sensor design: Flexible, lightweight, and easy to install, the sensors require no electrical power and offer long-term stability without recalibration.Extended reach: Standoff cable lengths of up to 200 meters per channel enable remote sensing in hard-to-access locations.ApplicationsThe versatility and precision of the ODiSI 7100 Series make it suitable for a wide range of technical applications:Advanced materials characterization: Capture strain profiles in composites, metals, and hybrid materials to support R&D and quality assurance.Process optimization: Monitor in-situ temperature distributions to enhance efficiency in manufacturing and energy systems.Finite element model validation: Measure two- and three-dimensional strain fields to verify simulation accuracy.Structural integrity assessment: Detect micro-cracks and defects in aerospace, automotive, and civil infrastructure components.Smart part integration: Embed sensors within materials to create intelligent components capable of self-monitoring.What's Next?The ODiSI 7100 Series is more than a sensor system, it’s a platform for innovation. Whether you're developing next-generation aerospace structures, optimizing battery performance, or validating complex simulations, the ODiSI 7100 delivers the data density and reliability needed to push boundaries. Its seamless integration with Luna’s visualization and analysis software further enhances usability and insight.To explore how the ODiSI 7100 Series can elevate your research or industrial application, contact our sales team today for a personalized consultation or quote.