Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-08-09
2005-08-09
Phan, Hanh (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S042000, C398S091000, C398S140000, C398S141000, C398S182000, C398S183000, C398S187000, C398S200000, C398S201000, C398S202000, C398S208000, C398S209000, C398S214000
Reexamination Certificate
active
06928246
ABSTRACT:
A detector outputs a detection signal indicating amplitude variation of an input frequency-multiplexed signal. An amplitude controller adjusts the amplitude of the frequency-multiplexed signal by referring to the detection signal. A modulator modulates the amplitude-adjusted frequency-multiplexed signal to produce a predetermined modulated signal. A second multiplexer multiplexes the modulated signal and the detection signal to produce a multiplexed signal. An optical transmitter converts the multiplexed signal into an optical signal, and then sends it out to an optical transmission path. An optical receiver converts the received optical signal into an electrical signal. A separator separates the modulated and detection signals from the electrical signal. A demodulator demodulates the modulated signal to output the frequency-multiplexed signal. An amplitude adjuster adjusts the amplitude of the frequency-multiplexed signal by referring to the detection signal to reproduce the original amplitude variation.
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Matsushita Electric - Industrial Co., Ltd.
Phan Hanh
Wenderoth , Lind & Ponack, L.L.P.
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