Abstract
We have experimentally demonstrated what to our knowledge is a novel
framing-recognition and performance-monitoring scheme for the synchronous optical
network (SONET) using the radio-frequency spectral analysis and taking advantage of the
intrinsic data structure of the SONET signal itself. This scheme does not require access
to individual bits or recovered clock and data. It can recognize SONET frame-alignment
sequences and generate framing pulses correspondingly. It also provides an analog
indicator that varies monotonically with the in-band signal-to-noise ratio and hence the
channel bit error rate. In principle the proposed scheme can be scaled to data rates of
OC-192 and higher.
© Optical Society of America
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