Title:
POLARIZED WAVE MODULATING DEVICE
Document Type and Number:
Japanese Patent JPH02272432
Kind Code:
A
Abstract:
PURPOSE:To perform polarized wave modulation without attenuating signal light by making the polarized wave directions of 1st and 2nd exciting light beams coincident with the main axis of an optical fiber for polarized wave maintaining type amplification and specifying the angle between the polarized wave direction of the signal light and the polarized wave directions of the 1st and 2nd exciting light beams. CONSTITUTION:The exciting light E1 which is the projection light from a 1st light source 1 and the exciting light E2 which is the projection light from a 2nd light source are multiplexed by a 1st multiplexer 4 so that their polarized light directions cross each other orthogonally. The multiplexed exciting light beams E1 and E2 are multiplexed by a 2nd multiplexer 5 with signal light S which is a continuous wave. The signal light S and the exciting light beams E1 and E2 which are multiplexed by the multiplexer 5 are made incident on the optical fiber for amplification. At this time, the polarization direction of the signal light S is adjusted by a polarized wave adjuster 7 so that the exciting light beams E1 and E2 are at 45 deg.. Then the Raman amplification of the signal light S is with the exciting light beams E1 and E2. The gain at the time of the Raman amplification becomes maximum when the polarization directions of the exciting light and signal light coincide with each other and minimum when the polarization directions cross each other orthogonally.
Inventors:
HORIGUCHI TSUNEO
YAMASHITA KATSUYA
TATSUTA MITSUHIRO
SHIMIZU MASATOSHI
KOBAYASHI HIDEO
KAWASE MASAAKI
YAMASHITA KATSUYA
TATSUTA MITSUHIRO
SHIMIZU MASATOSHI
KOBAYASHI HIDEO
KAWASE MASAAKI
Application Number:
JP9194589A
Publication Date:
November 07, 1990
Filing Date:
April 13, 1989
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G02B6/00; G02F1/35; H01S3/06; H01S3/067; H01S3/17; H01S3/30; H04B10/516; H04B10/532; H04B10/54; H04B10/61; (IPC1-7): G02B6/00; G02F1/35; H01S3/17; H04B10/04; H04B10/06
Attorney, Agent or Firm:
Tsuneo Shiramizu (1 person outside)