Patent ID: 9300109
Filing Date: 2016-03-29
CPC Classification: H01S

Claim Text:
1. A serial servo system for monitoring and controlling an optical path length, the serial servo system comprising: a first controller configured to receive an error signal and generate a first drive signal in response to the error signal, the error signal configured to vary in response to variation of the optical path length; a first driver configured to receive the first drive signal and adjust the optical path length with an electro-optic modulator in response to the first drive signal; a second controller configured to receive the first drive signal and generate a second drive signal in response to the first drive signal; and a second driver configured to receive the second drive signal and adjust the optical path length with a piezo-electric transducer in response to the second drive signal; wherein the piezo-electric transducer responds more slowly than the electro-optic modulator and has a greater stroke than the electro-optic modulator.