Browsing by Author "Chang, Ching Cheng"

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Effects of filter bandwidth and driving voltage on optical duobinary transmission systems
(2007-07-01)
Lu, Yu Chang
;
Wei, Chia Chien
;
Chen, Jason (Jyehong)
;
Feng, Kai Ming
;
Yeh, Pao Chi
This work demonstrates how electrical driving voltage of a Mach-Zehnder modulator and the bandwidth of electrical low-pass filters (LPFs) affect optical duobinary signals. The fact that a 100% driving voltage does not necessarily yield optimal results in duobinary systems is established both numerically and experimentally. Various filter bandwidths correspond to respective optimum driving voltages. In a 10 Gbps duobinary system, compared with the conventional condition of using a 2.5 GHz electrical LPF, a 2.5 dB sensitivity improvement is obtained by employing a 3 GHz LPF with an 88% driving voltage of fully driving. (c) 2007 Published by Elsevier Inc.