On the Use of Delay-Decorrelated I/Q Test Sequences for QPSK and QAM Signals
- 6 April 2012
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 24 (12), 1000-1002
- https://doi.org/10.1109/lpt.2012.2192423
Abstract
We report on limitations of the commonly used method to generate complex optical signal constellations from delay-decorrelated copies of a bit sequence to modulate in-phase (I) and quadrature (Q) components of a signal constellation. Using closed-form analytical solutions, numerical simulations, and an experimental verification, we show that I/Q delays shorter than the combined channel and adaptive equalizer length can result in artificial improvements of the measured bit-error ratio.Keywords
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