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Probability distribution of phase-induced intensity noise generated by distributed-feedback lasers
Optics Letters
|September 18, 2009
Summary
Laser frequency noise causes non-Gaussian photocurrents in fiber-optic systems with wideband receivers. This noise reverts to Gaussian with narrower receiver bandwidths, impacting interferometer performance predictions.
Area of Science:
- Optics and Photonics
- Telecommunications Engineering
Background:
- Distributed-feedback lasers in fiber-optic systems can exhibit laser-phase-induced intensity noise.
- Interference processes introduce cosinusoidal nonlinearity, affecting signal characteristics.
Purpose of the Study:
- To investigate the statistical properties of photocurrent distributions in fiber-optic systems under specific noise conditions.
- To understand the impact of laser frequency noise on intensity fluctuations and system performance.
Main Methods:
- Observation of photocurrent distributions in fiber-optic systems with distributed-feedback lasers and wideband receivers.
- Analysis of the conversion of laser frequency noise to intensity fluctuations via interference nonlinearity.
- Comparison of intensity noise statistics for different receiver bandwidths relative to laser linewidth.
Main Results:
- Highly non-Gaussian, short-tailed photocurrent distributions were observed due to laser-phase-induced intensity noise.
- Laser frequency noise is converted to non-Gaussian intensity fluctuations by the system's cosinusoidal nonlinearity.
- Intensity noise statistics rapidly become Gaussian when the receiver bandwidth is narrower than the laser linewidth.
Conclusions:
- The observed non-Gaussian photocurrent statistics have implications for predicting the performance of systems with interferometers.
- System design, particularly receiver bandwidth, is critical in managing intensity noise statistics and ensuring accurate performance predictions.
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