On the Configurations of Double Optical Fiber Loop or Ring Resonator with Double Couplers

Abstract

A systematic study has been presented of the construction of various configurations of double fiber loop or ring resonators with double couplers. The eight basic building blocks from which these configurations are made are a single fiber ring, loop and mirror with one ot two couplers. Nineteen different resonator configurations have been constructed and they can be classified into seven groups. Their properties, advantages, disadvantages and potential applications are discussed. excluded here, beause it is a four-port device). Although there seems numerous configurations, many of them are virtually identical, due to the symmetry. Consequently, there are only nineteen different ring and loop resonator configurations.Only qualitative results are presented for the purposes of the present paper. All mathematics and analytical expressions will be avoided, because including them will make the paper too lengthy. Moreover, most of these nineteen configurations have been analysed quantitatively elsewhere [4,[7][8][9][10][11][12][13][14][15].

A Vernier S-shaped fiber double-loop resonator with double couplers and degenerate two-wave mixing

“…Among them is the use as an optical filter and/or demultiplexer in densely spaced OFDM or WDM systems [l], [2], [6], [7]. These systems require that the ring or loop resonator is tunable and has a wide free spectral range (FSR) and large finesse (= FSR/FWHM where FWHM denotes the full linewidth at half maximum) in order to accommodate more channels and has tolerable interchannel crosstalks.…”