High performance 140 Mbit/s FSK coherent system

Hardcastle, I.; Large, T.; Davis, F.; Hadjifotiou, A.

doi:10.1049/el:19900978

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…The ideal performance of dual filter heterodyne FSK lightwave systems were previously studied by several authors assuming ideal conditions for the intermediate frequency (IF) In particular, in [2], [9] and [10] the sensitivity degradation due to laser phase noise and shot noise was studied assuming that the F and the frequency separation between the two tones are infinitely large. In practical systems, however, these assumptions are not valid [1], 131, [4], [11], [12]. In this paper, we study the impact of finite frequency deviation on the system performance.…”

Section: Introductionmentioning

confidence: 99%

Impact of Finite Frequency Deviation on the Performance of Dual-Filter Heterodyne FSK Lightwave Systems

Tonguz¹,

Tanrikulu²,

Kazovsky³

1991

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A detailed theoretical analysis is given for the impact of finite frequency deviation on the sensitivity of dual-filter heterodyne Frequency Shift Keying (FSK) lightwave systems. Our analysis provides closed-form signal-to-noise ratio (SNR) results for estimating the bit-error-ratio (BER) performance of the system. These closed-form results provide an insight into the impact of finite frequency deviation 2Afd, laser linewidth Am, bit rate R 6 , and IF filter bandwidths on the system performance. It is shown that there is a well-defined relationship between the choice of frequency deviation and the tolerable amount of laser phase noise. When there is no phase noise, a frequency deviation of 2Afd = 0.72R6 is sufficient for 1 dB sensitivity penalty with respect to infinite frequency deviation case; whereas for a linewidth of Am = 0.50R6 the required frequency deviation increases to 2Af 4 = 3.42P6 for the same sensitivity penalty. The sensitivity degradation can be very severe for a fixed linewidth as the frequency deviation gets smaller: for a linewidth of 20% the sensitivity penalty is only 0.54 dB when the frequency deviation is infinite whereas it is 3.48 dB when the frequency deviation is 2Afd = R. We also quantify the impact of finite frequency deviation on optimum IF filter bandwidths. For a fixed linewidth, the optimum IF filter bandwidth decreases as frequency deviation becomes smaller: for Am = 0.5R the optimum IF filter bandwidth reduces from 714 to 3R1 when 2Afd reduces from very large values to 314.

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Section: Introductionmentioning

confidence: 99%

Impact of Finite Frequency Deviation on the Performance of Dual-Filter Heterodyne FSK Lightwave Systems

Tonguz¹,

Tanrikulu²,

Kazovsky³

1991

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Applications of Coherent Techniques to Optical Transmission: State of the Art and Perspectives

Betti

Marchis

Iannone

1993

Trans Emerging Tel Tech

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The state of the art and the perspectives of application of coherent techniques to optical‐transmission systems are discussed. After a review of the performance achieved with point‐to‐point single channel transmission systems, different frequency‐division‐multiplexed systems are analyzed for both point‐to‐point transmission and local area network applications. Attention has been devoted to possible applications of coherent optical systems in broadcast and local area networks exploiting both subcarrier and frequency division multiplexing techniques. In conclusion the potentials offered by these systems are considered relatively to space intersatellite optical links.

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Laser communication transmitter and receiver design

Caplan

2007

Free-Space Laser Communications

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High performance 140 Mbit/s FSK coherent system

Cited by 6 publications

References 4 publications

Impact of Finite Frequency Deviation on the Performance of Dual-Filter Heterodyne FSK Lightwave Systems

Impact of Finite Frequency Deviation on the Performance of Dual-Filter Heterodyne FSK Lightwave Systems

Applications of Coherent Techniques to Optical Transmission: State of the Art and Perspectives

Laser communication transmitter and receiver design

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