Wavelength-changeable light source capable of changing wavelengt

Details Wavelength-changeable light source capable of changing wavelengt Wavelength-changeable light source capable of changing wavelengt

1997-06-10

2000-08-15

Hofsass, Jeffery A.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

372 20, 372 32, 372 34, H04B 1004

Patent

active

061045160

ABSTRACT:
In a wavelength-changeable light source of the present invention, a wavelength control is performed using a plurality of control systems when the wavelength of a laser, particularly a semiconductor laser, is to be controlled. Wavelength control characteristics of the respective control systems are different from each other, and the wavelength control can be flexibly carried out by combining those characteristics. Specifically, one of the plural control systems is a current control unit for controlling a current supplied to the semiconductor laser and another thereof is a temperature control unit for controlling temperature of the semiconductor laser. In the structure, the wavelength shift with a speedy response time, which can be attained in a wavelenth-changeable range obtainable by the current control, can be carried out over a wide wavelength-changeable range obtainable by the temperature control.

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