Bias system in an optical CATV modulator

Details Bias system in an optical CATV modulator Bias system in an optical CATV modulator

1996-09-30

1998-09-22

Lefkowitz, Edward

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 359180, 359187, 359188, H04B 1000

Patent

active

058122974

ABSTRACT:
An analog-external-modulation optical, emitter is described which comprises an electro-optical modulator and a piloting circuit. The piloting circuit comprises a pilot-tone-generating circuit; an electric control signal generated by the optical signal coming out of the modulator and a predetermined bias voltage are fed to the input of a differential amplifier the output of which is added to the pilot tone to feed an electric input of the electro-optical modulator. The RF input of the analog electric signal is connected to a linearizer circuit to which the pilot-tone-generating circuit is also connected. The output of the linearizer circuit is sent to an electric input of the electro-optical modulator through a band-stop filter adapted to eliminate the pilot tone downstream of the linearizer circuit.

REFERENCES:
patent: 5161044 (1992-11-01), Nazarathy et al.
patent: 5321543 (1994-06-01), Huber
patent: 5453868 (1995-09-01), Blauvelt et al.
patent: 5526164 (1996-06-01), Link et al.
patent: 5617240 (1997-04-01), Hergault et al.

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