Experimental set-up
The 5200 km transmission was demonstrated in a re-circulating loop with 400 km UltraWave fiber. The set-up is very similar to the one used in [1]. Figure 1 shows the ETDM transmitter used in the experiment. It generates 40 CS-RZ channels with 100 GHz spacing in the C-band. Even and odd channels are modulated separately by two 43G transponders in loop-back configuration. The transponders are driven by differently delayed versions of a 42.7 Gbit/s data signal. This signal is formed by electrical multiplexing of four 10.7 Gbit/s signals generated by EFEC encoding a 231-1 PRBS from a pattern generator (PG). An interleaver combines even and odd channels and dispersion compensating fiber gives 160 ps/nm pre-compensation.
The launch power into the transmission fiber is -6.5 dBm per channel. Figure 1 also shows the ETDM receiver together with the post dispersion compensation and the optical DMUX. The receiver is also a 43G transponder in loop-back configuration. It delivers a 42.7 Gbit/s electrical data signal which is demultiplexed into its four 10.7 Gbit/s tributaries that are subsequently FEC decoded and sent to the error counter (EC). The measured BER is the average of the four tributaries.
Figure 1. 40G transmitter (top) and receiver (bottom).
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