Wavelength locker using modulator current and photodetector

Details Wavelength locker using modulator current and photodetector Wavelength locker using modulator current and photodetector

2008-05-13

2008-05-13

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S026000

Reexamination Certificate

active

07372879

ABSTRACT:
The wavelength of light emitted by a laser and modulated by a frequency response modulator is determined from the power of the emitted light and the current drawn by the modulator. From the temperature and current applied to the modulator and the optical power of the emitted light; the wavelength of the beam of light is determined as a function of a ratio of the current and power for each temperature of operation. As the wavelength of the emitted light shifts, for example as the laser ages or the laser temperature shifts, the inventive methods and devices then detect the wavelength shift and implement any necessary adjustments in the operating conditions of the laser diode. For example, a thermoelectric cooler can be used to heat or cool the laser diode as necessary to thereby adjust the wavelength of the emitted light.

REFERENCES:
patent: 5033114 (1991-07-01), Jayaraman et al.
patent: 5319435 (1994-06-01), Melle et al.
patent: 5469265 (1995-11-01), Measures et al.
patent: 6243401 (2001-06-01), Lee
patent: 7120183 (2006-10-01), Krasulick et al.
Kikuchi, et al., “Performance Analysis of Separated-Electrode DFB Laser Diode,” Electronics Letters, vol. 25, Issue No. 2, Jan. 19, 1989, pp. 162-163.

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