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Dispersion penalty reduction using an optical modulator with adjustable chirp

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7 Author(s)
Gnauck, A.H. ; AT&T Bell Lab., Holmdel, NJ, USA ; Korotky, S.K. ; Veselka, J.J. ; Nagel, J.
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Using a unique Ti:LiNbO/sub 3/ modulator, the value of the modulation chirp parameter that minimizes the transmission power penalty caused by fiber chromatic dispersion was experimentally identified. System experiments at 5 Gb/s using nonreturn-to-zero (NRZ) amplitude-shift-keyed (ASK) transmission with direct detection reception are discussed, and the optimum values of the modulation chirp parameter versus distance for transmission at 1.5 mu m wavelength over fibre having zero dispersion at 1.3 mu m are identified. 5 Gb/s NRZ transmission was achieved through distances of 128, 192, and 256 km of conventional fiber while incurring dispersion penalties of -0.5, 0.1, and 1.1 dB respectively, by operating at the quantum chirp value.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 10 )