Optical modulator noise nonlinearity reduction circuit

Details Optical modulator noise nonlinearity reduction circuit Optical modulator noise nonlinearity reduction circuit

1990-11-09

1992-11-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359187, G01J 132

Patent

active

051665093

ABSTRACT:
An optical modulator or laser source has a detector for detecting its output signal and for producing a corresponding output signal. A tapping device is connected to tap off a portion of the input modulation signal as a reference signal. The reference signal is compared and subtracted from the detector output signal by a subtraction unit in order to produce an error output signal which will be proportional to the laser noise/distortion components. This error signal is amplified and connected to an external modulator linked to the laser optical output and intensity modulates the laser output signal by the error signal in order to reduce or cancel the noise and distortion components in the signal.

REFERENCES:
patent: 4071751 (1978-01-01), Waksberg
patent: 4162398 (1979-07-01), Kayanuma
patent: 4198675 (1980-04-01), Moore
patent: 4672192 (1987-06-01), Muka et al.
patent: 4709417 (1987-11-01), Kuwabara
patent: 5073983 (1991-12-01), Pfizenmayer

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