Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-09-26
2006-09-26
Phan, Hanh (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S140000, C398S141000, C398S158000, C398S159000, C398S082000, C398S084000, C398S085000, C398S091000, C398S182000, C398S183000, C398S188000, C398S192000, C398S193000, C398S194000, C398S202000, C398S214000, C370S206000, C375S260000
Reexamination Certificate
active
07113702
ABSTRACT:
There is provided a WDM optical transmission system and transmission method that have excellent spectral efficiency. The WDM optical transmission system is provided with: an optical transmitting section having an optical transmitter that generates N wave (wherein N is an integer of 2 or greater) optical signals with an optical frequency spacing Δf [Hz] and modulated by a modulation bit rate B [bit/s] (wherein B/Δf≦1 [bit/s/Hz]) using a modulation device, and having a coupler that couples the optical signals; an optical receiving section provided with an optical DFT circuit of a sampling frequency Δf [Hz] that is equal to the optical frequency spacing; and a bit phase adjustor that makes bit phases of respective wavelength division multiplexed signals synchronous at an input of the optical DFT circuit.
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Sanjoh Hiroaki
Yamada Eiichi
Yoshikuni Yuzo
Darby & Darby
Nippon Telegraph and Telephone Corporation
Phan Hanh
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