In-line Fiber optic Attenuator ,Singlemode VOA,0-30dB range
In-line Fiber optic Attenuator ,Singlemode VOA,0-30dB range attenuator Variable optical attenuator(VOA) , or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber. The basic types of optical attenuators are fixed, step-wise variable, and continuously variable. Variable Optical Attenuators allow the user to manually vary the attenuation of the signal in the fiber as it is transmitted through the device. These VOAs can be used to to precisely balance the signal strengths in fiber circuits or to balance an optical signal when evaluating the dynamic range of the measurement system. The maximum specified attenuation is achieved within 10 turns of the adjustment screw
Single Mode Variable Optical Attenuators allow the user to manually vary the attenuation of the signal in the fiber as it is transmitted through the device. These VOAs can be used to to precisely balance the signal strengths in fiber circuits or to balance an optical signal when evaluating the dynamic range of the measurement system. The maximum specified attenuation is achieved within 10 turns of the adjustment screw
These VOAs are available unterminated or with FC/PC or FC/APC connectors. In addition, we offer electronic VOAs that provide manual or electronic control of the output power. Our fixed optical attenuators are fiber connectors that can be attached to an FC/PC or FC/APC single mode fiber patch cable. We also offer fixed optical attenuators for multimode fibers with SMA connectors.
| Return Loss | ≥65dB | Operating Temp Range | -40~75°C |
|---|---|---|---|
| Humidity | 95%RH |
Each attenuator has a lens to collimate the light from the input fiber. A blocking device or window can be manually adjusted by a screw (see schematics below). Then, a second lens is used to couple light into the output fiber. Thus, the coupling efficiency is changed until the desired attenuation is obtained.
For narrowband VOAs, turning the adjustment screw moves the blocking device up and down in order to achieve the desired attenuation.
For dual band VOAs, turning the adjustment screw rotates the window, causing a beam path deviation that changes the coupling efficiency into the output fiber.
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