BROAD BAND VOA
The VP series Variable Optical Attenuators (VOA) achieve lower Insertion Loss and better Polarization Dependent Loss characteristics. The VP Sercalo VOAs use a high impedance 0-5 V input port to set the attenuation.
- 0.4 dB insertion loss
- 2 ms response time
- Low PDL
- Miniature size
- Power management in DWDM transceivers
- Remote attenuation control
- EDFA control
MEMS VARIABLE OPTICAL ATTENUATOR (two simultaneous channels)
The Sercalo variable attenuator allows the continuous adjustment of the attenuation with a 0 – 5 V control voltage, while a 5 V supply is present. The VP1(2) variant has 2 optically independent channels which are controlled simultaneously by a single control pin. The miniature package withstands rugged environments and is well suited for direct mounting on printed circuit boards.
The variable attenuator operates by moving an obstructing element into the optical beam between two single mode fibers. Fabricated by the latest silicon micromachining technology the device features low optical loss and small size. The position of the obstructing element can be adjusted by an integrated electrostatic actuator, resulting in a fast and hysteresis free response. As shown in the static voltage ersus attenuation response, at low attenuation levels fine tuning of the attenuation is possible, whereas at high levels the tuning is coarser.
Typically, a maximum attenuation of over 45 dB is obtained with 5 V at the driver pin. The voltage on this pin is amplified by the built in voltage converter to the appropriate voltage on the electrostatic actuator of the MEMS chip, which controls attenuation. The driver is ESD sensitive.