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Real-time wavelength reuse based on Bragg trans-reflection for dynamic reference frequency and data transfer in Datacom

ABSTRACT We experimentally demonstrate the first VCSEL-based all-optical wavelength reuse technique with reconfigurable fibre Bragg grating add and drop multiplexer. EDFA gain saturation and Bragg trans-reflection effect on a single FBG are respectively, adopted for full-duplex reference frequency and data transfer. A 1550 nm energy-efficient VCSEL is modulated with 1.7 GHz clock signal and transferred downstream over 26.6 km fibre OLT attain a phase noise stability of −54.01 dBc/Hz at 10 kHz offset frequency. A saturated EDFA is exploited to optically reduce the peak-to-peak voltage of the incoming downstream RF, allowing for wavelength reuse with 10 Gbps upstream data. A 1.57 dB transmission penalty is incurred over the transmission fibre. An all-passive OADM is developed exploiting Bragg trans-reflection at 1549.45 nm. The reflected wavelength is routed over another 24.7 km fibre network attaining an extinction ratio of 6.1 dB and a SNR of 5.8 dB. This work provides an all-optical technique for routing and spectral management in flexible networks.