Auto Bias Control Technique Based on Asymmetric Bias Dithering for Optical QPSK Modulation
2012; Institute of Electrical and Electronics Engineers; Volume: 30; Issue: 7 Linguagem: Inglês
10.1109/jlt.2012.2184261
ISSN1558-2213
AutoresHiroto Kawakami, Eiji Yoshida, Yutaka Miyamoto,
Tópico(s)Photonic and Optical Devices
ResumoThis paper describes a simple and highly sensitive auto bias control (ABC) technique based on asymmetric bias dithering for optical quadrature phase shift keying (QPSK) modulation and QPSK variants. Using our asymmetric bias dithering proposal, the required bandwidth of the ABC circuit is only dc ~ 2 f d , where f d is the frequency of dithering, f d <; 1 kHz. Thus, the circuit can be constructed without using high-speed components, and bias control performance is not limited by the signal bit rate. In this paper, we detail the concept of asymmetric bias dithering. We describe experiments that confirm bias monitoring and ABC operation, using a 20-64 Gbit/s optical QPSK signal. Its typical penalty is 0.1 dB, and Q factor fluctuation is negligible over 6 h of operation.
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