Output Characteristics of an Optical Fibre Ring Resonator Using a Planar or Nonplanar 3 × 3 Fibre Coupler: A Comparison |
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| Authors: | YH JA |
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| Affiliation: | 1. Telecom Australia , Research Laboratories , Box 249, Clayton, Victoria, 3168, Australia;2. School of Electrical Engineering , Monash University , Clayton, Victoria, 3168, Australia |
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| Abstract: | Abstract A comparison is made between the output characteristics of type 1 optical fibre ring resonators with a different type of 3 × 3 fibre coupler, that is a planar or a nonplanar coupler. Three different nonplanar couplers are formed when the central fibre 1 of a loosely coupled planar 3 × 3 fibre coupler is displaced normally from the common plane. Such a 3 × 3 fibre coupler can be identified by the value of its relative coupling ratio m 3. The dependence of the output intensities of the ring resonator on the coupling length kd and the relative coupling ratio m 3 of the 3 × 3 fibre coupler is investigated. The former dependence can be used as a guide to obtain suitable output characteristics of a fibre ring resonator for a specific application, while the latter can be used to choose the right type of 3 × 3 fibre coupler to build a fibre ring resonator. It is found that the output characteristics of a fibre ring resonator with a 3 × 3 planar (m 3 = 0) or an equilateral triangular (m 3 = 1) fibre coupler are usually better than those of the others. |
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