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한기호 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.8
Theoretical modeling and simulation for investigation of degree-of-polarization trapping in local area during compensation of polarization mode dispersion are presented and performed. The simulation results show that the occurrence and characteristics of unwanted local convergent peaks and ridges depend on condition of both differential group delay and launch angle of optical signal to input principal state of polarization of fiber transmission link, and the required escape angle from those local trapping areas can be found and determined.
한기호 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.6
An improved in-band, optical signal-to-noise ratio (OSNR)-monitoring method suppressing the effects of both polarization mode dispersion (PMD) and the polarization extinction ratio of a polarization beam splitter (PBS) by using enhanced tracking of the principal states of polarization is proposed and theoretically and experimentally demonstrated. The experimental results show that the OSNR measured by using the proposed method agrees well, within an error of 1 dB, with the OSNR measured by using an optical spectrum analyzer (OSA). The proposed per-channel OSNR monitoring method was demonstrated to be applicable to future dynamically-reconfigurable wavelength-division-multiplexed (WDM) optical networks.