Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2011-08-23
2011-08-23
Liu, Li (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S188000, C398S140000, C398S158000, C398S163000, C398S183000, C398S212000, C398S213000
Reexamination Certificate
active
08005374
ABSTRACT:
An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulated signal component detection circuit (222), which uses the signal train output from a balanced detection circuit (221) to detect the infinitesimal-modulated signal component applied to the phase adjustment terminal (201) of an MZI (200) by an infinitesimal-modulated signal oscillation circuit (224); a synchronous detection circuit (223), which synchronously detects the infinitesimal-modulated signals output from the infinitesimal-modulated signal component detection circuit (222) and infinitesimal-modulated signal oscillation circuit (224) and detects the error signal component arising from the shift between the optical signal carrier frequency and the optical frequency characteristic of the MZI (200); and a controller (207), which outputs a control signal to adjust the phase difference between two split optical signals output from the MZI (200) so as to correct the shift amount.
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Funatsu Gentaro
Hirano Akira
Kataoka Tomoyoshi
Kuwahara Shoichiro
Sano Akihide
Harness & Dickey & Pierce P.L.C.
Liu Li
Nippon Telegraph and Telephone Corporation
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