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

Details Optical source with frequency locked to an in-fiber grating reso Optical source with frequency locked to an in-fiber grating reso

1992-01-23

1993-05-04

Epps, Georgia Y.

Coherent light generators

Particular beam control device

Optical output stabilization

372 29, 372 38, H01S 313

Patent

active

052088197

ABSTRACT:
A frequency stabilized optical signal source is provided. A laser produces an optical carrier at a wavelength .lambda.. Feedback is provided to adjust the wavelength .lambda.. 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.

REFERENCES:
patent: 4912716 (1990-03-01), Mead
patent: 4977565 (1990-12-01), Shimosaka et al.
patent: 5119391 (1992-06-01), Maeda et al.
patent: 5136600 (1992-08-01), Fidric et al.
patent: 5150372 (1992-09-01), Nourrcier
T. Day, et al., "Active Frequency Stabilization of a 1.062-.mu.m, Nd:GGG, Diode-Laser-Pumped Nonplanar Ring Oscillator to Less than 3 Hz of Relative Linewidth," Optics Letters, vol. 15, No. 4, pp. 221-223, (1990).
T. Day, et al., "Optical Geenration of Frequency Stable mm-Wave Radiation Using Diode Laser Pumped Nd:YAG Lasers for Visible and IR Photo Detector Calibration," Optical Society of American, Nov. 3-8, 1991.

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