06351323 is referenced by 42 patents and cites 2 patents.

In an OADM system, an OADM device includes an AOTF. The AOTF can select an optional wavelength by changing the frequency of an RF signal to be applied. An optical signal having a specified wavelength can be dropped from a wavelength-multiplexed optical signal input from an input terminal, or a wavelength-multiplexed optical signal input from an add port can be multiplexed with a through optical signal. However, considering the increase in coherent cross talk, the AOTF should be exclusively used for dropping in an actual device configuration. Otherwise, a drop optical signal is branched by an optical coupler with the wavelength selected by a tributary station. Thus, the wavelength selected by the tributary station can be extracted by the AOTF from the through optical signal.

Title
Optical transmission apparatus, optical transmission system, and optical terminal station
Application Number
9/80399
Publication Number
6351323 (B1)
Application Date
May 18, 1998
Publication Date
February 26, 2002
Inventor
Terumi Chikama
Kawasaki
US
Tadao Nakazawa
Kawasaki
US
Yutaka Kai
Kawasaki
US
Kazue Otsuka
Kawasaki
US
Hideyuki Miyata
Kawasaki
US
Hiroshi Onaka
Kawasaki
US
Agent
Staas & Halsey
US
Assignee
Fujitsu
US
IPC
H04B 10/04
View Original Source