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Title: PMD-insensitive cd monitoring based on rf clock power ratio measurement with optical notch filter
Authors: Yang, J.
Yu, C. 
Yang, Y.
Cheng, L.
Li, Z.
Lu, C.
Lau, A.P.T.
Tam, H.-Y.
Wai, P.K.A.
Keywords: Chromatic dispersion (CD)
optical fiber communication
optical performance monitoring
polarization-mode dispersion (PMD)
Issue Date: 2011
Citation: Yang, J., Yu, C., Yang, Y., Cheng, L., Li, Z., Lu, C., Lau, A.P.T., Tam, H.-Y., Wai, P.K.A. (2011). PMD-insensitive cd monitoring based on rf clock power ratio measurement with optical notch filter. IEEE Photonics Technology Letters 23 (21) : 1576-1578. ScholarBank@NUS Repository.
Abstract: We propose and experimentally demonstrate a chromatic-dispersion (CD) monitoring method based on radio-frequency (RF) clock power ratio measurement in 38-Gb/s nonreturn-to-zero differential quadrature phase-shift keying (NRZ-DQPSK) and 57-Gb/s NRZ differential 8-level phase-shift keying (D8PSK) systems. A narrowband fiber Bragg grating (FBG) notch filter is centered at the optical carrier wavelength, such that the RF clock power decreases with CD. On the other hand, RF clock power increases with CD in the absence of the notch filter. By using the RF power ratio of the filtered and nonfiltered signals, polarization-mode-dispersion (PMD) effects on RF power ratio can be eliminated and CD measurement sensitivity can be increased. The CD monitoring range is 0 ∼ 250 ps/nm in the systems with a symbol rate of 19-Gsym/s. Moreover, the proposed CD-monitoring method is not affected by received optical power. © 2006 IEEE.
Source Title: IEEE Photonics Technology Letters
ISSN: 10411135
DOI: 10.1109/LPT.2011.2164519
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