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We demonstrate a bidirectional real-time symmetric 1.25 Gbit/s per user UDWDM-PON with simple DSP-less transceivers. ODN losses of 38 dB are achieved in a 12.5 GHz grid which includes both downstream and upstream with HD video transmission.
Direct phase modulation of DFB is demonstrated with DPSK, DQPSK and Duobinary modulation formats and detected with an intradyne receiver based on a 120-degree hybrid. The system is tested in a 50 km fibre link with 6.25 GHz channel spacing among users in a UDWDM-PON. By using higher modulation formats, the spectral efficiency can be increased in a single carrier system without spectral shaping while...
The performance of a directly phase modulated RSOA and an equalized DFB is compared with homodyne coherent detection for udWDM-PONs. Both device produce similar signals but the receiver sensitivity improves by 1.5dB at BER=10−3 with the RSOA because of its flatter phase response and less intensity modulation residual than the DFB.
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