FREQUENCY RESPONSE OF FIBER RING RESONATOR AND ITS APPLICATION IN DFB LASER WAVELENGTH VARIATION MEASUREMENT

Frequency response of a fiber ring resonator (FRR) composed of an ordinary optical coupler and a segment of optical fiber is theoretically and experimentally investigated. The frequency response equation based oil small-signal modulation is derived and studied in detail. It is shown that the shape of the frequency response curve is very sensitive to the wavelength; as a result, the FRR can be applied to measure the wavelength of a lightwave source with high resolution. With this method, we demonstrate the measurement of tiny changes of wavelength of a DFB laser. (C) 2009 Wiley Periodicals. Inc. Microwave Opt Technol Lett 51 2444-2448, 2009 Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24608

National Natural Science Foundation of China 60820106004 60536010605060066060601960777029National Basic Research Program of China 2006CB604902 G2006CB302806 2006dfa11880 2009AA03Z409 The authors are grateful to Mr. X. Wang Mr. H.Q. Yuan and Mr. Y. Liu of our institute for packaging the lasers and making the measurements. This work is Supported in part by the National Natural Science Foundation of China under Grants 60820106004 60536010 60506006 60606019 and 60777029 and in part by the National Basic Research Program of China under Grants 2006CB604902 G2006CB302806 2006dfa11880 and 2009AA03Z409.