Optical source with frequency locked to an in-fiber grating...

H - Electricity – 01 – S

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H01S 3/131 (2006.01) H01S 3/139 (2006.01) H01S 5/0687 (2006.01)

Patent

CA 2079863

A frequency stabilized optical signal source is provided. A laser produces an optical carrier at a wavelength ~. Feedback is provided to adjust the wavelength ~. In order to provide the feedback, a portion of the optical carrier is modulated by a periodic reference signal. An optical fiber with an in-fiber resonator is coupled to receive the modulated optical carrier. The resonator effects a phase and/or amplitude change between the modulated optical carrier and a sideband thereof at a resonant frequency of the resonator. The phase or amplitude change is detected and used to adjust the laser wavelength. In a preferred embodiment, a moire grating having a single resonant frequency is used as the in-fiber resonator. The feedback scheme can lock either to the carrier frequency itself, or to a selected sideband of the modulated optical carrier.

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