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C-band polarisation orthogonality preservation in 5Gb/s, 50µm multimode fibre links up to 3km

Etienne Rochat, Stuart D. Walker, and Michael C. Parker

Open Access Open Access

Abstract

We have investigated the polarisation-maintenance capability of 50µm graded-index multimode fibres (MMF) in the C-band. Using both circularly, and linearly polarisation-multiplexed signals centre-launched into the MMF, we found that orthogonality is sufficiently maintained in both cases to yield typically 10dB optical isolation between the channels. Using orthogonally circular polarisation-multiplexed signals, we show experimentally that two 3 and 5Gb/s data channels may be transmitted error free over 50µm multimode fibre spans up to 3km in length.

©2003 Optical Society of America

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Figures (7)
Fig. 1.
Fig. 1. (a) Schematic of the orientations of the two polarisation multiplexed signals with respect to the PBS (the PBS is assumed aligned to the x-axis; (b) Polarisation ellipse at the output of 300m and (c) 3km of 50µm MMF for 2 orthogonal circular input SOP’s, as measured with a Stokes analyser.

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Fig. 2.
Fig. 2. Effect of orientation and orthogonality mismatch on channel cross-talk.

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Fig. 3.
Fig. 3. Poincar sphere representation of antipodal input and quasi-antipodal output polarisations before and after 3km of 50µm MMF.

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Fig. 4.
Fig. 4. Schematic diagram of experimental set-up for polarisation-multiplexed MMF transmission.

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Fig. 5.
Fig. 5. (a) Eye diagrams for the 3Gb/s circularly left polarised and (b) 5Gb/s circularly right polarised channels after polarisation demultiplexing at the end of a 300m sample of MMF.

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Fig. 6.
Fig. 6. (a) Eye diagrams for the 3Gb/s circularly left polarised and (b) 5Gb/s circularly right polarised channels after polarisation demultiplexing at the end of a 3km sample of MMF.

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Fig. 7.
Fig. 7. BER curves measured at 5Gb/s for a circular left polarised channel, with and without associated 3Gb/s orthogonally-polarised multiplexed channel.

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Equations (1)

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Xt y = P 1 sin ⁡ ( ψ − Δδ 2 ) P 2 sin ⁡ ( ψ + Δδ 2 ) , Xt x = P 2 cos ⁡ ( ψ + Δδ 2 ) P 1 cos ⁡ ( ψ − Δδ 2 ) ,
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