Variable Optical Attenuators

Fiber Optical Power Regulator

The optical power regulator is engineered to maintain a constant output power by compensating for input fluctuations. It operates by tapping a small portion of the output light with a detector and feeding it into a precision closed-loop circuit, which controls a MEMS variable fiber optical attenuator positioned between the input and output. With a wide dynamic range, it effectively limits output against input surges of up to 40 dB. The output power level can be adjusted manually via a set screw or remotely through a USB-connected GUI. The system requires an insertion loss of approximately 2 dB to regulate the output power effectively. Additionally, it compensates for polarization-dependent loss (PDL) variations along with optical power fluctuations.

Fiber Optical Power Regulator / Protector / Noise Reduction

High Power Inline Variable Fiber Attenuator up to 20W USB/RS232

This all-fiber variable optical attenuator (VOA) provides near-lossless transmission in its open (transparent) state while enabling electrically controlled attenuation up to 10 dB and handling optical power levels as high as 10 W. It operates by applying precise bending stress to the fiber using a motorized mechanism, allowing controlled attenuation without significantly degrading signal quality, and is designed to maintain a high polarization extinction ratio even under stress. The device offers ultra-broadband performance that preserves the fiber’s intrinsic transmission characteristics and is compatible with various fiber types. It is typically used in feedback control systems with an output tap monitor for precise power regulation, and because generated heat is transferred to the metal base, it must be mounted on an appropriate heat sink for safe and stable operation.

High Speed Premium Variable Fiber Optical Attenuator 350-2400nm, 18dB

The Nano-Speed Premium Variable Fiber Optical Attenuator (NPOA) provides fast electrical control of optical power. It utilizes special electro-optic crystals that feature lower driving voltage, faster response, and broader wavelength coverage compared to the standard NSOA. This is achieved through a patented configuration activated by a voltage electrical control signal. The solid-state optical crystal design eliminates mechanical movement and organic materials, ensuring high reliability and fast response with minimal mechanical footprint. The NPOA Series Variable Optical Attenuators are designed to meet the most demanding operational requirements, offering ultra-high reliability and fast response times, as well as vibration insensitivity. Our also provides customized electronic designs to meet special control requirements and applications.

High Speed Premium Variable Fiber Optical Attenuator 350-2400nm, 35dB

The Nano-Speed Premium Variable Fiber Optical Attenuator (NPOA) provides fast electrical control of optical power. It utilizes special electro-optic crystals that feature lower driving voltage, faster response, and broader wavelength coverage compared to the standard NSOA. This is achieved through a patented configuration activated by a voltage electrical control signal. The solid-state optical crystal design eliminates mechanical movement and organic materials, ensuring high reliability and fast response with minimal mechanical footprint. The NPOA Series Variable Optical Attenuators are designed to meet the most demanding operational requirements, offering ultra-high reliability and fast response times, as well as vibration insensitivity. Our also provides customized electronic designs to meet special control requirements and applications.

In-Line Fixed Fiber Attenuator

The ILFA series of In-Line Fixed Attenuators is designed for precise optical power adjustment to a desired level. Featuring a fused passthrough fiber design, it ensures high reliability, making it suitable for airborne and space applications. The attenuator provides fixed attenuation levels ranging from 0 dB to 20 dB, with 0.5 dB increments for fine-tuned power control. We offer custom configurations to meet specific application requirements, including different connector types and end-face configurations. PM Panda fiber (PM780-HP, PM980, PM1550, PM1950)

Large Core Fiber Variable Attenuator USB/RS232

The HPLA Series VOA is based on moving fiber technology with a precision motor featuring low optical loss. This broad spectral band is only limited by fiber intrinsic properties and precision/repeatability for fibers with large core sizes up to 2mm in diameter. It is designed for high precision and high fidelity measurements with little optical mode dependence. Conventional light deflections and blockings affect light transmission characteristics, but fiber-fiber technology overcomes this by eliminating coating and Lens. The HPLA has two built-in optical position sensors so that once the VOA attenuation value is set, it will remain at the value regardless of the environment variations. It has a high repeatability of 0.1dB and a high resolution. Once powered, it is a latching device that can be operated in vibration environments.

Linear Digitally Control MEMS Variable Attenuators

The PMOA Series Precision Variable Optical Attenuator (VOA) delivers fast response and precision attenuation with calibrated performance curves, enabling rapid and repeatable adjustments with excellent long-term stability. The design ensures low insertion loss, high repeatability, and drift-free operation under varying environmental conditions. The PMOA supports a wide range of fiber types, including single-mode, multimode, and polarization-maintaining, and operates across a broad spectral band from 750 to 2400 nm. This turnkey unit includes USB and RS232 interfaces with GUI software supporting sequential programming for automated control. A PCB sub-mount version is also available, offering UART control and 0–5 V power input for seamless OEM system integration.

Manual No-Gap Broadband Variable Fiber Optical Attenuator — Low-Loss

The Fiber-Fiber™ Series Manual Variable Optical Attenuator (VOA) delivers industry-leading performance with ultra-low insertion loss and continuous, perturbation-free light transmission. Its ultra-broadband operation is limited only by the transmission characteristics of the optical fiber, enabling exceptionally wide wavelength coverage. The patented Fiber-Fiber™ technology utilizes direct fiber-to-fiber coupling through a self-aligned MEMS platform. A microscopic gap of less than 5 μm between the fiber end faces is filled with a proprietary non-fluorescent, index-matching liquid, creating a nearly lossless optical path without the need for lenses, collimators, or anti-reflection coatings. This unique architecture virtually eliminates Fresnel reflections and minimizes insertion loss while maintaining excellent optical fidelity.

Manual Variable Fiber Optical Attenuator — Regular

This Manal VOA is based on a pair of fiber collimator coupling between a movable blocker, featuring low cost. It has a broadband AR coating.

MEMS Broadband Optical Attenuator – Fiber-Fiber™

The Fiber-Fiber™ series VOA is based on fiber-to-fiber direct coupling with a micro-electro-mechanical (MEMS) shutter in between. It eliminates the need for lens and optical coating, featuring low loss, ultra-broadband without altering fiber transmission character, high power, compact size, and easy drive. The current MEMS chips accommodate fiber with 3 to 105 mm core diameters. VOAs with fiber of larger diameters can be made with special chip fabrication run with an NRE charge. The Fiber-Fiber™ series VOA is compliant with the Telcordia 1209 and 1221 reliability standards. The VOA is driven by directly applying a low electrical voltage. The VOA is electrically a resistor load, has no polarity, and is electrostatically insensitive.

MEMS Fiber Optical Variable Attenuator – 1D

This MEMS VOA offers >70dB large attenuation, high polarization extinction ratio, and low cost. The VOAs are bidirectional and Telcordia standards GR-1221 qualified. We provide customized designs and modular assemblies to meet control and integration applications.

MEMS Reflective Fiber Optical Variable Attenuator – 1D

The MEMS Series Fiber Optical Variable Attenuator uses a patented thermal-activated micro-mirror, moving-in and -out optical paths, uniquely featuring a large extinction ratio, high stability over a wide temperature range, and a very long life cycle. The thermal MEMS is insensitive to moisture and ESD without drift issues, providing a high-reliability platform for over 25 years of continuous operation. The MEMS Straight Series VOAs are configured in single and dual channels (activated at the same time). The VOAs are bidirectional and are Telcordia standards GR1221 qualified. We provide customized design and modular assemblies to meet control and integration applications.

Mini MEMS 8 Channel Variable Optical Attenuator Array

The MEMS series VOA array utilizes a micro-electro-mechanical mechanism with a compact design, simple construction, and easy direct drive, delivering exceptional optical performance. We offer two versions: one with high repeatability and attenuation of up to 40dB and another less precise version with up to 70 dB attenuation. Each channel in the VOA is controlled by directly applying an electrical voltage. The MEMS series VOA array complies with Telcordia 1209 and 1221 reliability standards. A version designed for reliable operation in vibration-prone environments is available as an option.

Multi-Channel VOA Array with Integrated Monitor

The Multi-channel Variable Fiber Optical Attenuator with Integrated Power Monitor Module (VOA-TAPM) is designed to provide the precision control of a steady output optical power or attenuation independent of environmental variations or input laser instability. The input-tap and output-tap are integrated with VOAs in a compact module. The module eliminates laser power variations, such as PDL, WDL, TDL, etc., and is particularly suitable for continuous optical power regulation and transient optical suppression, as well as analog signal modulation applications. The module is a platform ready for customization with a control electronics option.

Receptacle MEMS VOA

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SFP Variable Optical Attenuator 12

Our etMEMS™ Series SFP VOA is based on a proprietary micro-electro-mechanical mechanism featuring compact design, simple construction, easy direct drive, and excellent optical performance. The SFP VOA integrates a single channel VOA and tap power monitor into MSA compliant compact SFP form factor and provides I2C communication interface for easy system integration. The device has built-in firmware that linearizing the attenuation to the control signal. The power tap provides a digital warning when the output optical signal level below certain level. Either normally-open or normally-closed configurations are available.

Single Channel Multi Mode Fiber to Fiber VOA

The Fiber- Fiber™ series VOA is based on fiber to fiber coupling with a micro-electro-mechanical shutter in between, featuring low loss, broad wavelength, high power, compact size, low cost, easy drive, and excellent optical performance. The Fiber- Our™ series VOA is compliant with the Telcordia 1209 and 1221 reliability standards. The VOA is driven by directly applying a low electrical voltage.

Ultra Broadband Variable Optical Attenuator – Fiber-Fiber™

The Fiber-Fiber™ series VOA is based on fiber-to-fiber coupling with a micro-electro-mechanical shutter in between, featuring low loss, broadband, high power, compact size, low cost, easy drive, and excellent optical performance. The Fiber-Fiber™ series VOA complies with the Telcordia 1209 and 1221 reliability standards. The VOA is driven by directly applying a low electrical voltage.

Ultra-Mini MEMS Variable Attenuation Array

This series of MEMS Variable Attenuator Arrays boasts an ultra-miniature design, offering a 0-5V drive and low power consumption. It delivers excellent repeatability and outstanding optical performance. These arrays are fully compliant with the Telcordia 1209 and 1221 reliability standards, ensuring robust and reliable operation. The design incorporates pins for mounting, providing an efficient and secure installation method.

Variable Optical Attenuator - MEMS Mini

The MEMS Series VOA is based on our patented micro-electro-mechanical mechanism, featuring a compact design, high reliability, direct drive, and excellent optical performance. The MM series VOA is compliant with Telcordia 1209 and 1221 reliability standards. The VOA is available in either normally-open or normally-closed configurations, and it is driven by applying an electrical voltage.

Vibration Insensitive MEMS VOA with Input Power Monitor 1D

The mini MEMS Variable Optical Attenuator Integrated with Input Optical Power Monitor is a hybrid fiber optical device that integrates a thin-film tap of flat spectral response and a high sensitivity PIN photodiode for power monitoring applications with a MEMS VOA. The Power Monitor minimizes component assembly costs and module footprint. The thermal MEMS VOA has little temperature dependence and drift. It is intrinsically more reliable than electrostatic MEMS VOAs. The Power Monitor has low insertion loss and low dark current with high-temperature stability over a wide wavelength range from 1260nm to 1620nm band.