Abstract
A new technique for obtaining frequency-dependent magnitude and phase information across an optical channel is presented using tunable allpass optical filters and a detector with a small bandwidth relative to the full channel width. This technique has application to optical monitoring of intersymbol interference distortions, including chromatic and polarization-mode dispersion effects, and thus can provide vector information for input to the control of adaptive optical filters. A method for generating a test signal spanning the spectrum of a modulated data signal without introducing intersymbol interference is discussed. This technique can also be used to characterize an optical pulse source and does not scale in complexity or cost as the bandwidth of the source increases.
Highlights
A novel optical vector spectral analysis (OVSA) technique is proposed that measures the phase and amplitude of a signal using a detector having a limited bandwidth with respect to the full signal bandwidth
When a known signal with spectral components spanning the channel width is launched into a wavelength-division-multiplexed (WDM) optical communication system, it allows the frequency response of the system across the channel bandwidth to be determined
While phase and magnitude information can be obtained from the modulated signal without modification to the transmitter [3], methods to enhance the signal-to-noise ratio (SNR) and decrease the complexity and cost of the measurement are needed
Summary
A novel optical vector spectral analysis (OVSA) technique is proposed that measures the phase and amplitude of a signal using a detector having a limited bandwidth with respect to the full signal bandwidth. While the new OVSA can be used to characterize a periodic input pulse stream with an arbitrary waveform shape using a much simpler implementation that assumes a fixed input state of polarization, the explanation is given for an implementation that allows a channel with polarizationdependent loss and polarization-mode dispersion to be characterized. In the latter case, vector analysis implies characterization with respect to the phase response as in a traditional vector network analyzer as well as with respect to the vector nature of the incoming polarization. The output spectrum at the transmitter is shown in the inset
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