Reduction of Backscattering Induced Noise by Carrier Suppression in Waveguide-Type Optical Ring Resonator Gyro

• Published in: Journal of lightwave technology Vol. 29; no. 1; pp. 85 - 90
• Main Authors: Huilian Ma, Zuyuan He, Hotate, K
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2011; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Backscatter; Backscattering induced noise; carrier suppression; Circuit properties; Detection, estimation, filtering, equalization, prediction; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Frequency modulation; Information, signal and communications theory; Integrated optics. Optical fibers and wave guides; Modulation, demodulation; Optical and optoelectronic circuits; Optical fiber communications; Optical ring resonators; Optical telecommunications; Optical waveguides; Phase modulation; Resonant frequency; resonator optic gyro; Signal and communications theory; Signal, noise; Silicon compounds; Telecommunications; Telecommunications and information theory; waveguide ring resonator; Performance evaluation; Integrated optics; Waveguide resonator; Frequency modulation; Phase modulation; resonator optic gyro; Noise reduction; Backscattering; Optical resonator; Ring network; Waveguide; Microoptics; Optimization; waveguide ring resonator; Optical fiber network; Continuous wave; Ring resonator; Backscattering induced noise; Wave scattering; carrier suppression; Signal processing; Optical fiber communication
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2010.2092751

Resonator micro optic gyro (RMOG) with a waveguide-type ring resonator is a promising candidate for applications requiring small, light and robust gyros. In optical passive ring resonator gyros, clockwise (CW) and counter clockwise (CCW) lightwaves are phase-modulated at different frequencies to reduce the backscattering induced noise. The effectiveness of this technique, however, is determined by the carrier suppression level. In this paper, the influence of the carrier suppression level on the gyro performance is examined experimentally for an RMOG system with a silica waveguide resonator. In our experiment, carrier suppression is applied onto both the CW and the CCW lightwaves at the same time to achieve higher total suppression. We show that carrier suppression as high as 100 dB can be achieved by optimizing the amplitude of the phase modulation. A bias stability of 0.46 /s in 50 seconds is demonstrated in an RMOG with a silica waveguide ring resonator having a ring length of 7.9 cm. This is the best result reported to date, to the best of our knowledge, for waveguide-type ring resonator gyros of this size.