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Ippei Shake

at NTT Network Innovation Labs

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Proceedings Article | 11 February 2005 Paper

Q-factor monitoring using asynchronous sampling

Ippei Shake, Hidehiko Takara, Satoki Kawanishi

Proceedings Volume 5625, (2005) https://doi.org/10.1117/12.576015

KEYWORDS: Clocks, Optical networks, Eye, Signal to noise ratio, Signal detection, Modulators, Distortion, Error analysis, Picosecond phenomena, Signal processing

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Optical signal quality monitoring is an important function for optical transport networks and future all-optical networks. To monitor the optical signal-to-noise ratio and/or waveform distortion transparently with respect to the signal format, data format, and signal bit rate, we introduce an optical signal quality monitoring method that uses asynchronous sampling, which is a sampling technique that does not use timing extraction. The use of high-speed asynchronous sampling and the adjustment of the sampling rate enable simple open eye-diagram monitoring and evaluation of a fixed-timing Q-factor (Q_t) at the maximum eye opening timing phase. This method was experimentally verified using an optical signal quality monitoring circuit, and obtained a good relationship between the measured Q_t and Q (which is a Q-factor calculated from the bit error rate (BER)). Moreover, we also introduce an average Q-factor (Q_avg) evaluation method, which measures the Q_avg value from an asynchronous eye-diagram (timing drifted eye-diagram). This method is useful when the sampling rate is low or when adjusting the sampling rate is difficult.

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