Wavelength division multiplexing optical transmission system and transmission method
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United States of America Patent
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Sep 26, 2006
Issued Date -
N/A
app pub date -
Jul 31, 2002
filing date -
Aug 6, 2001
priority date (Note) -
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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 .DELTA.f [Hz] and modulated by a modulation bit rate B [bit/s] (wherein B/.DELTA.f.ltoreq.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 .DELTA.f [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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