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Demonstration of CoWDM using DPSK modulator array with injection-locked lasers

Demonstration of CoWDM using DPSK modulator array with injection-locked lasers

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A practical implementation of coherent wavelength division multiplexing (CoWDM) is demonstrated for the first time using injection-locked lasers and a DPSK modulator array. For a 31.99 Gbit/s system (three subcarriers at 10.664 Gbit/s) the null-to-null spectral bandwidth was only 42.656 GHz and the average receiver sensitivity measured was −33.5 dBm when all subcarrier phases were optimised.

References

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      • Cai, B., Wake, D., Seeds, A.J.: `Microwave frequency synthesis using injection locked laser comb line selection', Proc. IEEE LEOS Summer Topical Meeting on RF Optoelectronics, 1995, Keystone, CO, USA, p. 13–14, paper WD2.
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      • W. Shieh , H. Bao , Y. Tang . Coherent optical OFDM: theory and design. Opt. Express , 2 , 841 - 859
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      • Gunning, F.C.G., Healy, T., Yang, X., Ellis, A.D.: `0.6Tbit/s capacity and 2bit/s/Hz spectral efficiency at 42.6Gsymbol/s using a single DFB laser with NRZ coherent WDM and polarisation multiplexing', Proc. CLEO-Europe 2007, Munich, Germany, paper CI8-5-FRI.
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