Novel optical FSK heterodyne single filter detection system using a directly modulated DFB-laser diode

Emura, K.; Shikada, M.; Fujita, Shin; Mito, I.; Honmou, H.; Minemura, K.

doi:10.1049/el:19840696

Cited by 50 publications

(5 citation statements)

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“…Letting K 1K2 = K, we observe that (71) is identical in structure to (33), which again results in a Fokker-Plank equation yielding the steady-state probability density function (mod 211") for the phase error e"'cost/t p(t/t) = 211"I o(a)' -11" ::5 t/t ::5 11".…”

Section: Heterodyne Phase-locked Loopmentioning

confidence: 67%

Coherent Lightwave Communications

Salz¹

1985

At&T Technical Journal

158

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The chief objective of this paper is to develop a fundamental understanding of the effects of laser phase noise on the performance of coherent lightwave communication systems. A comprehensive treatment applicable to a wide variety of coherent receiver designs under a broad range of conditions is provided. Our models and analytical tools are developed in sufficient detail to encompass a broad range of applications. Formulas are derived for the bit error rate in homodyne and heterodyne Phase Shift Keying (PSK), Differential Phase Shift Keying (DPSK), Frequency Shift Keying (FSK) and on‐off keying. Estimates are provided of the penalties accrued due to phase noise. Based on detailed mathematical analysis and estimates, we made several findings. Near quantum‐limited receiver sensitivity can be achieved with PSK using homodyne detection only at signaling rates 3000 times greater than the laser linewidth. A receiver sensitivity 3 to 6 decibels poorer than the quantum limit can be achieved with heterodyne rather than homodyne detection. DPSK, for example, can operate at rates only 300 times greater than the laser linewidth. At lower rates, FSK is an attractive candidate. It can be designed to be extremely tolerant of phase noise by using wide frequency deviations.

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Section: Heterodyne Phase-locked Loopmentioning

confidence: 67%

Coherent Lightwave Communications

Salz¹

1985

At&T Technical Journal

158

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“…(29) is satisfied in the system investigated; then the BER floor due to phase noise is [36] = Q( PFSKPreFD where PFSK PreFD ~ " 2T_ WT (30) (31) (30) and (31) indicate that the lowest error rate is achieved with the smallest possible value of τ, which should be expected since in this case the frequency discriminator accumulates the minimum amount of phase noise (see (5 A)). The choice of τ is constrained by (29). Therefore, from (29) 1 Tmin 4L '…”

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 98%

“…Investigation of other coherent receivers is relegated to [33][34][35]. Prior to this work, laser linewidth requirements for the above-mentioned systems were studied in [6,14,[27][28][29][30][31][32]. Sections 5.2,6.4 and 7.2 compare the results of this paper with the results of [6,14,[27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

Kazovsky¹

1986

Journal of Optical Communications

111

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The impact of laser phase noise on optical heterodyne communications receivers is analyzed in terms of the system signal-to-noise ratios and error rates. An ASK receiver, three FSK receivers and a DPSK receiver are investigated. The maximum permissible laser linewidth Δν is evaluated for each of these receivers and compared with previously published theoretical and experimental results. It is shown that Δν depends on the system data rate R and on the modulation/demodulation technique chosen. For example, DPSK receivers require at least Δν ^ 0.7% of R while FSK receivers with postdetection frequency discrimination require at least Δν ^ 1.9% of R if the mark-space separation 2 f d is equal to R. At the same time, ASK receivers with envelope postdetection processing, and FSK receivers with large frequency deviation are much more tolerant to phase noise: they only require Av<9%ofR.

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“…This requires less receiver bandwidth but sacrifies 3 dB in signal power. Single filter detection FSK has been demonstrated at 100 Mbit / s [13], 140 Mbit / s [27], 280 Mbit / s [28] , and 560 Mbit / s [6].…”

Section: Demodulation Of Optical Fsk Signals the Type Of Intermediatementioning

confidence: 99%

FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Vodhanel

Gimlett

Cheung³

et al. 1987

J. Lightwave Technol.

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Optical frequency-shift-keying (FSK) signals are obtained from directly modulated distributed feedback (DFB) semiconductor lasers. Experimental studies of the direct frequency modulation (FM) characteristics of the DFB lasers show a nonuniform FM response due to the competing effects of thermal modulation of the laser active region and carrier density modulation. Equalization of the signal current to the laser is employed to produce a flat FM response from 30 kHz to 1 GHz. Optical FSK transmission and heterodyne detection experiments at 560-Mbit/s and 1-Gbit/s are conducted at a wavelength of 1497 nm. Receiver sensitivities of -39 dBm at 560 Mbit/s and -37 dBm at 1 Gbit/s are obtained. Transmission through 100 km of singlemode fiber at 1 Gbit/s is achieved with no degradation in receiver sensitivity.

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Novel optical FSK heterodyne single filter detection system using a directly modulated DFB-laser diode

Cited by 50 publications

References 1 publication

Coherent Lightwave Communications

Coherent Lightwave Communications

Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

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