Optical transmitting apparatus, optical receiving apparatus,...

Details Optical transmitting apparatus, optical receiving apparatus,... Optical transmitting apparatus, optical receiving apparatus,...

2005-12-30

2010-10-19

Tran, Dzung D (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S183000, C398S195000

Reexamination Certificate

active

07817923

ABSTRACT:
A phase shift unit provides a prescribed phase difference (π/2, for example) between a pair of optical signals transmitted via a pair of arms constituting a data modulation unit. A low-frequency signal f0is superimposed on one of the optical signals. A signal of which phase is shifted by π/2 from the low-frequency signal f0is superimposed on the other optical signal. A pair of the optical signals is coupled, and a part of which is converted into an electrical signal by a photodiode. 2f0component contained in the electrical signal is extracted. Bias voltage provided to the phase shift unit is controlled by feedback control so that the 2f0component becomes the minimum.

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