Synchronization monitoring of I/Q data and pulse carving misalignment for a parallel-type 20-Gb/s RZ-DQPSK transmitter by measuring RF clock tone/low frequency power

Published

December 15, 2008

Author(s)

Jeffrey A. Jargon, Xiaoxia Wu, Laurie Christian, Bo Zhang, Wei-Ren Peng, Jeng-Yuan Yang, Lin Zhang, Scott Nuccio, Loukas Paraschis, Alan Willner

Abstract

We experimentally demonstrate a technique for monitoring the time misalignment of in-phase/quadrature (I/Q) data streams and pulse carver/data in a 20-Gb/s return-to-zero differential quadrature phase-shift-keying (RZ-DQPSK) transmitter. By measuring the radio-frequency clock-tone power at 10 GHz and low frequency power at 600 MHz, a monitoring power dynamic range of 18 dB is obtained for I/Q data misalignment and 6 dB is shown for carver/data misalignment. With the monitor information, a simple feedback loop is proposed to automatically align the RZ-DQPSK transmitter.

Citation

IEEE Photonics Technology Letters

Volume

20

Issue

24

Pub Type

Journals

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Keywords

Fiber optics communications, return-to-zero differential quadrature phase-shift-keying (RZ-DQPSK), synchronization monitoring

Citation

Jargon, J. , Wu, X. , Christian, L. , Zhang, B. , Peng, W. , Yang, J. , Zhang, L. , Nuccio, S. , Paraschis, L. and Willner, A. (2008), Synchronization monitoring of I/Q data and pulse carving misalignment for a parallel-type 20-Gb/s RZ-DQPSK transmitter by measuring RF clock tone/low frequency power, IEEE Photonics Technology Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=33072 (Accessed March 13, 2025)