Title:
RING LASER LIGHT SOURCE OUTPUTTING CONSTANT POLARIZATION
Document Type and Number:
Japanese Patent JP3158716
Kind Code:
B2
Abstract:
PURPOSE: To arrange a polarized beam splitter and a polarization surface rotator in a loop circuit of a ring laser and make a polarization surface within the loop a constant polarization of only TE waves.
CONSTITUTION: A loop circuit comprises an optical wave adder 2; a rare-earth- added optical fiber 3; an isolator 4; a polarized beam splitter 6; a polarization surface rotator 9; and an optical coupler 5. With the use of outputs of the isolator 4 as received beams 11, the polarized beam splitter 6 isolates the received beams into TE wave components and TM wave components. The polarization surface rotator 9 rotates the TE wave components of the polarized beam splitter 6 by outputs of a control circuit 8 to generate the TM wave components, and the TM wave components are set off against the TM wave components to reduce outputs of an optical electric converting circuit 7. With the use of outputs of the polarization surface rotator 9 as inputs and with the use of the first outputs as second inputs of the optical wave adder 2, the optical coupler 5 fetches output beams from the second outputs.
Inventors:
Mikio Maeda
Nobuaki Takeuchi
Takao Minami
Nobuaki Takeuchi
Takao Minami
Application Number:
JP25584692A
Publication Date:
April 23, 2001
Filing Date:
August 31, 1992
Export Citation:
Assignee:
Ando Electric Co., Ltd.
International Classes:
G02B27/28; H01S3/083; H01S3/13; (IPC1-7): H01S3/083; G02B27/28; H01S3/13
Domestic Patent References:
| JP3214124A | ||||
| JP2253675A |