Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2007-08-14
2007-08-14
Sedighian, M. R. (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S188000, C398S198000, C359S248000, C359S279000
Reexamination Certificate
active
10691359
ABSTRACT:
Disclosed is a duobinary optical transmission apparatus using a semiconductor optical amplifier (SOA). The duobinary optical transmission apparatus includes a light source for generating a carrier wave; a duobinary precoder for encoding an input (non return to zero) electric signal; a semiconductor optical amplification unit to amplify the encoded signal from the duobinary precoder, wherein the amplification unit receives an optical amplification gain difference that varies with a bias current combined with the encoded signal; and an optical band pass filter for receiving a phase-modulated optical signal from the semiconductor optical amplification unit, filtering the received optical signal to a prescribed bandwidth, and thereby generates a duobinary optical signal.
REFERENCES:
patent: 6388786 (2002-05-01), Ono et al.
patent: 6563623 (2003-05-01), Penninckx et al.
patent: 6623188 (2003-09-01), Dimmick et al.
patent: 6865348 (2005-03-01), Miyamoto et al.
Hwang Seong-Taek
Kim Sung-Kee
Lee Gyu-Woong
Oh Yun-Je
Cha & Reiter LLC
Samsung Electronics Co,. Ltd.
Sedighian M. R.
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