Title:
光路長調整装置及び光路長調整方法
Document Type and Number:
Japanese Patent JP5412452
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To adjust the optical path length of duplexed optical lines at low loss and high speed.SOLUTION: A polarization separation coupler 11 is located at a branch point of duplexed optical lines using polarization maintaining optical fiber and also a polarization synthetic coupler 12 is located at a synthesizing point of the duplexed optical lines. Furthermore, optical fiber switching devices 13 and 14 which change the optical line length in steps of certain length are located on each of the duplexed optical lines, and an optical fiber 15 having half the certain length is located on only one side of the duplexed optical lines. Each optical line has branch couplers 16 and 17 and optical power monitoring photodetectors 191 and 192 located thereon. Optical path length adjustment is carried out by switching over in combined steps of the certain length in this configuration.
Inventors:
Koichi Yoshida
Ikuaki Tanaka
Kazuki Nado
Tetsuya Manabe
Yuji Azuma
Ikuaki Tanaka
Kazuki Nado
Tetsuya Manabe
Yuji Azuma
Application Number:
JP2011027146A
Publication Date:
February 12, 2014
Filing Date:
February 10, 2011
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04B10/038; H04B10/032; H04B10/07; H04B10/075
Domestic Patent References:
| JP2011166367A |
Foreign References:
| WO2010064561A1 |
Other References:
吉田耕一,田中郁昭,納戸一貴,真鍋哲也,東裕司,偏波保持光スイッチによるサービス無瞬断光媒体切替技術の検討,電子情報通信学会技術研究報告. OPE, 光エレクトロニクス,2011年 2月25日,VOL.110,No.437,P.21-P.26
Attorney, Agent or Firm:
Kurata Masatoshi
Toshizo Koide
Takashi Mine
Nobuhisa Nogawa
Toshizo Koide
Takashi Mine
Nobuhisa Nogawa