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Densely spaced FDM coherent optical star network using monolithic widely frequency-tunable lasers

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6 Author(s)
Glance, B. ; AT&T Bell Labs., Holmdel, NJ, USA ; Koch, T.L. ; Scaramucci, O. ; Reichmann, K.C.
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The authors present the results obtained with a densely spaced FDM coherent optical network using monolithic widely frequency-tunable lasers. The system consists of four channels transmitted around 1.53 mu m, FSK-modulated at 200 Mbit/s and spaced by 2.45 GHz. A 16*16 fibre star coupler combines the four optical signals. Demultiplexing is performed by a heterodyne FM receiver at an IF frequency of 850 MHz. The minimum received optical power needed to obtain a BER of 10-9 is -55.5 dBm or 109 photons/bit, which is 3.4 dB from the shot noise limit.

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Electronics Letters  (Volume:25 ,  Issue: 10 )