Optical transmitter and optical transmission system with switcha

Details Optical transmitter and optical transmission system with switcha Optical transmitter and optical transmission system with switcha

1998-12-28

2000-07-18

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359181, 359187, 385 2, 385 3, G02B 2600, G02F 101, G02F 1035, H04B 1004

Patent

active

060915358

ABSTRACT:
An optical transmitter has a Mach-Zehnder modulator, and a feedback loop that controls the bias voltage supplied to the modulator according to the insertion loss of the modulator, to compensate for DC drift in the attenuation characteristic of the modulator. The feedback loop can be switched to provide negative feedback on either the positive or negative slope of the attenuation characteristic. Switching the slope switches the polarity of the chirp generated by the modulator, enabling positive or negative chirp to be selected, whichever produces the least dispersion penalty. Since switching the slope also switches the polarity of the modulated signal, an optical transmission system using this optical transmitter has an additional circuit that selectively inverts the transmitted or received signal.

REFERENCES:
patent: 5408544 (1995-04-01), Seino
patent: 5778113 (1998-07-01), Yu

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