Automatic gain calibration system for a phase modulator in a fib

Details Automatic gain calibration system for a phase modulator in a fib Automatic gain calibration system for a phase modulator in a fib

1992-12-24

1994-11-08

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

332145, G01C 1972

Patent

active

053631951

ABSTRACT:
An automatic gain calibration system for a phase modulator for forcing a predetermined phase shift amplitude includes a phase modulator responsive to an applied voltage for modulating the phase of a radiation beam. The frequency spectrum of the modulated radiation beam is converted to the electrical domain where a selected even harmonic of the spectrum is nulled. The scaling circuit then responds to the amplitude of voltage applied to the phase modulator that obtains the phase shift which produced the nulling of the selected even harmonic and scales that voltage to generate the predetermined phase shift amplitude which is desired.

REFERENCES:
patent: 4796993 (1989-01-01), Sonobe et al.

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