| US 7,480,459 B2 | ||
| Wavelength division multiplexing transmission system | ||
| Kentaro Nakamura, Kawasaki (Japan); Hiroki Ooi, Kawasaki (Japan); and George Ishikawa, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Jul. 02, 2004, as Appl. No. 10/883,033. | ||
| Claims priority of application No. 2003-294414 (JP), filed on Aug. 18, 2003. | ||
| Prior Publication US 2005/0041975 A1, Feb. 24, 2005 | ||
| Int. Cl. H04B 10/00 (2006.01) | ||
| U.S. Cl. 398—83 [398/82; 398/85] | 36 Claims |
| 1. A wavelength division multiplexing transmission system for transmitting wavelength division multiplexing signals comprising:
at least one of a demultiplexing module unit and a multiplexing module unit, said demultiplexing module unit further comprises:
a first interleave filter unit demultiplexing said wavelength division multiplexing signal into a signal light of a first
channel group, that is one of an even channel group and an odd channel group and a signal light of a second channel group,
that is the other thereof, and outputting the demultiplexed signal lights,
wherein a first signal light of which the signal bandwidth is relatively large can be allocated to each channel of said first
channel group, and a second signal light of which the signal bandwidth is relatively small is allocated to each channel of
said second channel group;
a first demultiplexing unit demultiplexing the signal light of said first channel group from said first interleave filter
unit and outputting these signal lights, and
said multiplexing module unit further comprises:
a first multiplexing unit multiplexing a plurality of said first signal lights or said second signal lights that are input,
into a signal light of said first channel group and outputting the signal, and
a second interleave filter unit inputting a signal light of said first channel group from said first multiplexing unit, and
a signal light where a plurality of said second signal lights are disposed in said second channel group, multiplexing these
two input signal lights to generate said wavelength division multiplexed signal, and outputting the multiplexed signal,
wherein the first interleave filter unit includes a first port for outputting a signal light of the first channel group and
a second port for outputting a signal light of the second channel group, and
the first and second ports are set such that the bandwidth of a transmission band where light transmits and the bandwidth
of a non-transmission band where light does not transmit are different, the transmission band of the first port substantially
matches with the signal band of the first signal light and the transmission band of the second port substantially matches
with the signal band of the second signal light, and
wherein said first signal light is disposed in each channel constituting said first channel group, and
said first demultiplexing unit further comprises:
a first interleaver demultiplexing the signal lights of said first channel group from said first port of said first interleave
filter unit into a signal light of an even channel group constituting said first channel group and a signal light of an odd
channel group constituting said first channel group and outputting the signal lights;
a second interleaver demultiplexing the signal light of said even channel group from said first interleaver into a signal
light of an even channel group and a signal light of an odd channel group and outputting the signal lights;
a third interleaver demultiplexing the signal light of said odd channel group from said first interleaver into a signal light
of an even channel group and a signal light of an odd channel group and outputting the signal lights; and
four demultiplexers demultiplexing the signal lights of an even channel group and an odd channel group from said second interleaver
and the signal lights of an even channel group and an odd channel group from said third interleaver into signal lights with
each wavelength, respectively.
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