FREQUENCY STABILIZED LIGHT SOURCE

Japanese Patent JP3433044

B2

PROBLEM TO BE SOLVED: To stabilize an oscillation frequency, by fixing equivalent reflactivities of a front and a rear distribution reflector region to the same value and laser oscillation wavelengths to one wavelength, so that Bragg wavelengths of the front and the rear distribution reflectors may coincide.
SOLUTION: Bias current sources 18-21 are connected to a front side distribution reflector region(DBR) 2, a rear side DBR 3, a phase adjusting region 4, and a gain region of an SSG-DBR laser (laser) 1, respectively. The DBRs 2 and 3 are added with sine wave signals from signal sources 16, 17. The output light from the laser 1 is branched by means of fiber couplers 7, 8 and part of the light is guided to a synchronous detector 23 through an optical detector 9. The synchronous detector 23 makes a phase synchronous detection using the signal sources 16, 17, and detects an error A between a reflection peak wavelength and a longitudinal mode wavelength of the front side DBR and an error B between a reflection peak wavelength and a longitudinal mode wavelength of the rear side DBR. The detected errors A and B are fed back to the DBRs 2 and 3 through an amplifier 14 and a low pass filter 15 to stabilize the laser oscillation frequency.

WO/2024/028714	PULSED LASER DIODE DRIVER CURRENT MEASUREMENT CIRCUIT
JPS62190888	OPTICAL INTEGRATED CIRCUIT DEVICE
JPH10107359	SEMICONDUCTOR OPTICAL DEVICE

Hiroyuki Ishii
Fumiyoshi Kano
Yuzo Yoshikuni

JP13071597A

August 04, 2003

May 21, 1997

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Nippon Telegraph and Telephone Corporation

H01S5/068; H01S5/0687; (IPC1-7): H01S5/0687

JP856040A
JP856030A

Toshiro Mitsuishi (2 outside)

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