Laser oscillation wavelength monitoring device

Details Laser oscillation wavelength monitoring device Laser oscillation wavelength monitoring device

G - Physics

01

J

G01J 9/00 (2006.01) H04B 10/155 (2006.01)

Patent

CA 2281298

A laser oscillation wavelength monitoring device, which can obtain a changing direction and a changing amount of an oscillation wavelength without any relation with a polarization state of an incident light, whose manufacturing is made to be easy, is provided. The laser oscillation wavelength monitoring device provides a lens that converts an incident light from an optical fiber in which an optical signal is transmitted by a wavelength division multiplex (WDM) technology to a beam, a polarizer that makes an arbitrary linear polarization state in the beam transmit, a polarization splitting means that splits the arbitrary linear polarization state into a first polarization state and a second polarization state, a first and a second optical band pass filters to which each polarization state split by the polarization splitting means is inputted, a first and a second light receiving elements which receive light transmitted through the first and second optical band pass filters respectively and convert the received light to electric signals, a divider that calculates a ratio of digital values that the output levels of the first and second light receiving elements are converted at analog/digital (A/D) converters, an adder that accumulates the outputs of the divider every designated unit time, and a counter. And the laser oscillation wavelength monitoring device outputs an average value that the accumulated result designated times at the adder is divided by the counted value.

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