© The Institution of Electrical Engineers
The first four-channel 565 Mbit/s FSK transmission experiment at 1.53 μm is reported based on tunable three-electrode DFB lasers. −44 dBm receiver sensitivity and 5.5 GHz minimum channel spacing have been measured for 10−9 bit error rate.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19900568
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