US 7,321,733 B2 | ||
Split-band optical transmission system and optical transmission method used therein | ||
Tsuyoshi Ikushima, Yamatotakada (Japan); and Masaru Fuse, Neyagawa (Japan) | ||
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan) | ||
Appl. No. 10/515,228 PCT Filed Jun. 04, 2004, PCT No. PCT/JP2004/008143 § 371(c)(1), (2), (4) Date Nov. 22, 2004, PCT Pub. No. WO2004/112293, PCT Pub. Date Dec. 23, 2004. |
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Claims priority of application No. 2003-169068 (JP), filed on Jun. 13, 2003. | ||
Prior Publication US 2005/0213977 A1, Sep. 29, 2005 | ||
Int. Cl. H04B 10/12 (2006.01) |
U.S. Cl. 398—141 [398/79; 398/182; 398/183; 398/192; 398/194; 398/200; 398/201; 398/202; 398/208; 398/209; 398/214; 398/91; 398/94; 398/93; 398/33; 398/34; 398/158; 398/159; 398/147; 398/162; 398/76; 398/82] | 24 Claims |
1. An optical transmission system comprising:
an optical transmitting device for converting an inputted data signal to an optical signal and for transmitting the optical
signal to an optical transmission path; and
an optical receiving device for receiving the optical signal transmitted via the optical transmission path and for converting
the received optical signal to the data signal,
wherein:
the optical transmitting device includes:
a data signal splitting section for splitting information included in the data signal into at least two pieces of information,
and for generating at least two respective electrical signals having different center frequencies and bands;
a frequency multiplexing section for performing frequency multiplexing of the at least two electrical signals generated by
the data signal splitting section so as to generate a frequency-multiplexed signal; and
an electrical-to-optical conversion section for converting the frequency-multiplexed signal generated by the frequency multiplexing
section to an optical signal and for transmitting the optical signal to the optical transmission path;
the optical receiving device includes:
an optical-to-electrical conversion section for converting the optical signal transmitted via the optical transmission path
to the frequency-multiplexed signal;
a band demultiplexing section for demultiplexing the frequency-multiplexed signal output from the optical-to-electrical conversion
section to obtain the at least two electrical signals; and
a data signal recovering section for recovering the data signal based on the at least two electrical signals demultiplexed
by the band demultiplexing section;
each of the electrical signals generated by the data signal splitting section are located in different frequency bands which
are away from a local minimum of a frequency response of the optical transmission path; and
the data signal splitting section includes:
a signal splitting section for splitting the information included in the data signal into the at least two pieces of information
in accordance with a predetermined split ratio corresponding to the frequency response of the optical transmission path, and
outputting the at least two pieces of information as at least two baseband signals, the at least two baseband signals including
at least a first and a second baseband signal; and
at least one band up conversion section for converting a signal, which contains at least the second baseband signal and excludes
the first baseband signal of the at least two baseband signals output from the signal splitting section, to a passband signal
having a predetermined frequency as a center frequency, wherein the first baseband signal and the passband signal are output
from the data signal splitting section as the generated at least two electrical signals.
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