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Dual-core intermodal coupler by mechanical gratings

Dual-core intermodal coupler by mechanical gratings
Dual-core intermodal coupler by mechanical gratings
Intermodal coupling in optical fibres by periodic bending and twisting has been investigated by various authors for its applications in optical filters. Here we report the first demonstration of intermodal coupling in a dual-core (DC) fibre by bending the fibre periodically by a fixed mechanical grating. The DC fibre had two cores with the same refractive index but different radii. Due to the mismatch between the two cores, the two fundamental normal modes in the DC fibre were very much like the fundamental modes of the two isolated fibres and were therefore physically separated, one in each core. The two modes could thus be separated with much less difficulty than in the previous schemes. An ordinary fibre can be spliced to either core of the DC fibre to couple in/out a particular mode with a small insertion loss (0.1dB demonstrated). This new scheme has the potential of being developed into a tunable fibre filter or a signal tap in a WDM system without any requirement for precise optical alignment. The tunability of the device is also demonstrated.
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Ober, M.H.
381b7d1f-7407-4519-b1b0-b7175a07ec80
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Ober, M.H.
381b7d1f-7407-4519-b1b0-b7175a07ec80
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a

Dong, L., Ober, M.H. and Russell, P.St.J. (1992) Dual-core intermodal coupler by mechanical gratings. Conference on Applied Optics and Optoelectronics, United Kingdom. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Intermodal coupling in optical fibres by periodic bending and twisting has been investigated by various authors for its applications in optical filters. Here we report the first demonstration of intermodal coupling in a dual-core (DC) fibre by bending the fibre periodically by a fixed mechanical grating. The DC fibre had two cores with the same refractive index but different radii. Due to the mismatch between the two cores, the two fundamental normal modes in the DC fibre were very much like the fundamental modes of the two isolated fibres and were therefore physically separated, one in each core. The two modes could thus be separated with much less difficulty than in the previous schemes. An ordinary fibre can be spliced to either core of the DC fibre to couple in/out a particular mode with a small insertion loss (0.1dB demonstrated). This new scheme has the potential of being developed into a tunable fibre filter or a signal tap in a WDM system without any requirement for precise optical alignment. The tunability of the device is also demonstrated.

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Published date: September 1992
Venue - Dates: Conference on Applied Optics and Optoelectronics, United Kingdom, 1992-09-01
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 379773
URI: https://eprints.soton.ac.uk/id/eprint/379773
PURE UUID: 5537c92c-669b-45e9-8f44-5968846a12fd

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Date deposited: 29 Jul 2015 11:59
Last modified: 17 Jul 2017 20:40

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Contributors

Author: L. Dong
Author: M.H. Ober
Author: P.St.J. Russell

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