A phase stable short pulse generator using a DPMZM and phase modulators for application in 160 GBaud DQPSK systems

A method of 40GHz phase stable short pulses generation is experimentally demonstrated. It is based on a dual parallel Mach–Zehnder modulator (DPMZM) driven by only one electrical sinusoidal clock and two cascaded phase modulators. The generated pulses are characterized with full-width-at-half-maximu...

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Bibliographic Details
Published in:Optics communications 2012-04, Vol.285 (7), p.1964-1969
Main Authors: Ji, Yu, Li, Yan, Wu, J., Zhang, F.Z., Xu, K., Li, W., Hong, X.B., Lin, J.T.
Format: Article
Language:English
Subjects:
Clocks
Differential quadrature phase shift keying (DQPSK)
Dual parallel Mach–Zehnder modulator (DPMZM)
Extinction
Modulators
Noise levels
Optical time-division multiplexing (OTDM)
Phase modulator
Phase stability
Short pulses
Signal to noise ratio
Timing jitter
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Summary:A method of 40GHz phase stable short pulses generation is experimentally demonstrated. It is based on a dual parallel Mach–Zehnder modulator (DPMZM) driven by only one electrical sinusoidal clock and two cascaded phase modulators. The generated pulses are characterized with full-width-at-half-maximum pulse width of 1.9ps, extinction ratio of 27dB, timing jitter of 36fs and signal to noise ratio over 30dB. The high quality and phase stability of the pulses are further experimentally verified in a 4×40 GBaud differential quadrature phase shift keying (DQPSK) optical-time-division-multiplexing (OTDM) system.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2011.12.071