Title:
【発明の名称】一括偏波制御方法
Document Type and Number:
Japanese Patent JP2540935
Kind Code:
B2
Abstract:
Frequency division multiplex signal lights (1) are propagated through an optical fiber (10), and polarizations of the lights are collectively controlled by a polarization controller (2). The polarization-controlled signal lights are received separately in receiving systems (4, 5, 6), including optical heterodyne or homodyne receivers (11). In the collective polarization control, a step is selected from steps of controlling relative polarization states of local oscillation lights to coincide to each other, receiving a control signal from one of the receiving systems which receives a signal light of a frequency to be allocated in the center of a frequency band of the signal lights or the vicinity thereof, and dividing the frequency division multiplex signal lights into plural groups, thereby controlling polarizations collectively in each of the plural groups. One of the polarizations of the signal lights may be orthogonal to the others, and one of the polarizations of the local oscillation lights may be orthogonal to the others correspondingly.
Inventors:
YAMAZAKI SHUNTARO
ONO TAKASHI
SHIMIZU HARUHITO
ONO TAKASHI
SHIMIZU HARUHITO
Application Number:
JP6571689A
Publication Date:
October 09, 1996
Filing Date:
March 16, 1989
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
G02F2/00; H04B10/2513; H04B10/2569; H04B10/516; H04B10/61; H04B10/63; H04B10/64; H04J14/00; H04J14/02; (IPC1-7): G02F2/00; H04B10/04; H04B10/06; H04B10/142; H04B10/152; H04J14/00; H04J14/02
Domestic Patent References:
| JP6399697A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)