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Performance of single- and double-ring resonators using 3×3 optical-fiber coupler

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3 Author(s)
Chew, Y.H. ; Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore ; Tjhung, T.T. ; Mendis, F.V.C.

This paper investigates theoretically the transmission characteristics of single- and double-ring resonators using 3×3 optical-fiber couplers. Two configurations of a 3×3 coupler are considered: configuration A, with the three fibers centered at the vertices of an equilateral triangle, and configuration B, with their centers aligned in a straight line. It is found that a ring resonator using configuration A does not show any performance improvement over ring resonators using 2×2 couplers. On the other hand, a single-ring resonator using configuration B has a performance close to resonators using 2×2 couplers. It is also shown that a double-ring resonator using a 3×3 coupler exhibits resonance with a double peak, which may find application in the filtering of coherent frequency-shift keying (FSK) signals after optical amplification in an optical-fiber line repeater

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 12 )