Product Data 905P/905P-M
Description
Model 905(p) variable ratio couplers are made with optically contacted polished fibers mounted in substrate blocks that have transverse motion in the contact plane to adjust core-to-core separation distance. In the case of PM fiber, the orientation of the fast and slow axes is preserved during the motion. A negligibly thick oil layer is used to lubricate the substrate blocks and ensure smooth motion. Long term ratio stability is better than 1% under laboratory conditions. Fine transverse motion is accomplished by means of a micrometer and lever system. The 25:1 lever ratio gives approximately one micron of motion at the coupler center per 0.001 inch division on the micrometer. This motion however, is not free of hysteresis or backlash and a particular micrometer reading or selected position for the remote 905-M driver will not correspond to a particular fixed ratio, only to a nominal ratio. Accurate ratio settings can only be made by observation of the outputs. (X and Y if input A or B). Hysteresis and backlash tend to be reduced if the device is used repeatedly. Available fibers have cutoff wavelengths ranging from 710 nm to 1550 nm. For a particular fiber used in a variable coupler the useful bandwidth extends from the single mode cutoff wavelength to approximately 1.3 times the cutoff wavelength, where losses begin to occur. The Model 905(P)-M is the Model 905 variable ratio coupler, the ratio can be remotely controlled with a PC (through a USB port) using a New Focus Picomotor™ and Controller/Driver. The Picomotor can also be adjusted using the manual hand knob adjustment. The knob can be rotated while the motor is plugged into the driver and the driver is on but not driving the motor. The drive pulses are only sent to the Picomotor when commanded to by the controller.
Product Data 905P/905P-M
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Frequently Asked Questions
Yes, accurate ratio settings can only be made by observation of the outputs (X and Y if input A or B) since hysteresis and backlash tend to be reduced if the device is used repeatedly.
The core-to-core separation distance is adjusted by means of a micrometer and lever system that allows for fine transverse motion, with a 25:1 lever ratio giving approximately one micron of motion at the coupler center per 0.001 inch division on the micrometer.
The Model 905(P)-M is the remotely controlled version of the Model 905(P) variable ratio coupler, with the ratio being remotely controlled with a PC (through a USB port) using a New Focus Picomotor™ and Controller/Driver.
The Model 905(P)/905(P)-M Polarization Maintaining Variable Ratio Evanescent Wave Coupler is a device that allows for precise ratio adjustment, low excess loss, low back reflection, low polarization cross talk, and large operating bandwidth.
For a particular fiber used in a variable coupler, the useful bandwidth extends from the single mode cutoff wavelength to approximately 1.3 times the cutoff wavelength, where losses begin to occur.