Progress in Quantum Electronics 33 (2009) 110–125 Review Dynamic response of a fiber-optic ring resonator: Analysis with influences of light-source parameters Faramarz E. Seraji Optical Communication Group, Iran Telecom Research Center, Tehran, Iran Abstract In practice, dynamic behavior of fiber-optic ring resonator (FORR) appears as a detrimental factor to influence the transmission response of the FORR. This paper presents dynamic response analysis of the FORR by considering phase modulation of the FORR loop and sinewave modulation of input signal applied to the FORR from a laser diode. The analysis investigates the influences of modulation frequency and amplitude modulation index of laser diode, loop delay time of the FORR, phase angle between FM and AM response of laser diode, and laser diode line-width on dynamic response of the FORR. The analysis shows that the transient response of the FORR strongly depends on the product of modulation frequency and loop delay time, coupling and transmission coefficients of the FORR. The analyses presented here may have applications in optical systems employing an FORR with a laser diode source. r 2009 Elsevier Ltd. All rights reserved. Keywords: Dynamic response; Fiber-optic ring resonator; Loop phase modulation; FM deviation Contents 1. Introduction ...................................................... 111 2. Dynamic behavior of FORR .......................................... 112 2.1. Phase modulation of the loop of FORR .............................. 113 2.1.1. Conditions for dynamic responses ............................ 114 2.2. Sinewave modulation of the input signal to FORR ...................... 115 3. Numerical computations ............................................. 119 3.1. Influence of modulation frequency of laser diode ........................ 119 3.2. Influence of loop delay time of the FORR ............................ 120 ARTICLE IN PRESS www.elsevier.com/locate/pquantelec 0079-6727/$ - see front matter r 2009 Elsevier Ltd. All rights reserved. doi:10.1016/j.pquantelec.2009.05.001 E-mail address: feseraji@itrc.ac.ir