Title:
LIGHT FREQUENCY REFERENCE LIGHT SOURCE GENERATOR
Document Type and Number:
Japanese Patent JP3500582
Kind Code:
B2
Abstract:
PURPOSE: To provide the frequency reference light source of a nonmodulated semiconductor laser having good stability as the light frequency reference light source generator for optical communication.
CONSTITUTION: Second harmonic wave light is generated by a second harmonic wave generating means 2 from the output light of the semiconductor laser 1 of 1.5μm band and is multiplexed with light of 0.78μm frequency from a 0.78μm frequency generating means 3 where the frequency is locked. The beat signal thereof is converted by a photodetecting means 5 to an electric signal. A stable microwave frequency f0 is generated from a local signal generating means 7 and is multiplied by the output of the photodetecting means in a multiplying means 6, the output of which is inputted to a phase comparing means 8. A control section 9 for driving the semiconductor laser in such a manner that the frequency of the beat signal and the frequency of the microwaves coincide with each other by using the result of the comparison is provided.
Inventors:
Kazue Ohtsuka
Application Number:
JP29554492A
Publication Date:
February 23, 2004
Filing Date:
November 05, 1992
Export Citation:
Assignee:
富士通株式会社
International Classes:
H01S3/109; H01S3/13; H01S5/068; G02F1/37; H01S5/0687; (IPC1-7): G02F1/37; H01S5/00
Domestic Patent References:
| JP216784A | ||||
| JP3238885A |
Foreign References:
| WO1990003054A1 |
Attorney, Agent or Firm:
Kazuo Hosaka (2 outside)