Linewidth-insensitive coherent AM optical links: design, performance, and potential applications

Fong, T.K.; Sabido, IX D.J.M.; Kalman, Robert F.; Tabara, M.; Kazovsky, L.G.

doi:10.1109/50.285336

Cited by 12 publications

(9 citation statements)

References 15 publications

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“…Disregarding the additive noise for the moment, the envelope of the squared photocurrent is then given as (8) where is the recovered signal, and is the SLD conversion amplitude.…”

Section: System Descriptionmentioning

confidence: 99%

“…Using the relation [16] (24) for a Gaussian random variable and its variance , the integral can be cast in a tractable form (the Appendix). Reference [8] approximates the phase-to-intensity noise power as the power of the modulated portion of the IF signal which is cut off by the IF filter. In this work, we estimate the phase-to-intensity noise power by numerical evaluation of using the method in the Appendix.…”

Section: Phase-to-intensity Noise Spectrummentioning

confidence: 99%

“…One of the challenges facing coherent links is the degradation of performance in the presence of laser phase noise, and hence recent efforts have focused on amplitude modulation (AM) due to its relative immunity from such noise [7], [8]. In particular, WIRNA (wideband filter rectifier narrowband filter) processing has been predicted to achieve virtually linewidthinsensitive performance with the proper design of the intermediate frequency (IF) filter [8], [9].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, WIRNA (wideband filter rectifier narrowband filter) processing has been predicted to achieve virtually linewidthinsensitive performance with the proper design of the intermediate frequency (IF) filter [8], [9]. However, the IF filter bandwidths needed for minimum performance degradation are often unobtainable in practice due to the high cost of wide bandwidth components.…”

Section: Introductionmentioning

confidence: 99%

“…An approximate analysis of the effects of phase noise on AM-WIRNA system performance was done previously in [8]. However, this early approximation differs significantly from experimental results in several cases and does not calculate the PSD of the PTI noise, which is required to address the effects of PTI noise in narrow-band links.…”

Section: Introductionmentioning

confidence: 99%

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Phase noise in coherent analog AM-WIRNA optical links

Taylor

Poor

Forrest

1997

J. Lightwave Technol.

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Coherent analog amplitude modulated-wideband rectifier narrowband (AM-WIRNA) systems have been the focus of many recent studies because of their high performance and relative immunity to phase noise compared to angle modulated systems. Despite their natural advantages over angle modulated systems, AM-WIRNA receivers are still vulnerable to phase noise because of distortion of their phase broadened signals in a finite bandwidth system. We present the first numerical analysis of the effects of this distortion on the performance of AM-WIRNA systems. The analysis accurately models the power spectral density of the phase-to-intensity noise with a root-mean-square deviation from the averaged experimental noise spectrum of 1.2 dB and a maximum deviation of 3.8 dB in the modulation range of <2 GHz. The accuracy of the analysis is limited primarily by nonidealities in the AM-WIRNA receiver and the accuracy of the analytical intermediate frequency (IF) filter model. Optimal link designs are presented which minimize the impact of phase-to-distortion noise in AM-WIRNA systems. We present experimental data from AM-WIRNA links which use both external cavity and distributed feedback lasers for the signal and local oscillator sources. The numerical analysis predicts the link signal-to-noise ratio (SNR) for different signal laser powers to within 1.4 dB of experiment. We find that systems requiring high SNR such as phased array antennas and AM-CATV are significantly affected by this noise.

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“…Disregarding the additive noise for the moment, the envelope of the squared photocurrent is then given as (8) where is the recovered signal, and is the SLD conversion amplitude.…”

Section: System Descriptionmentioning

confidence: 99%

Section: Phase-to-intensity Noise Spectrummentioning

confidence: 99%