Performance of directly modulated DFB lasers in 10-Gb/s ASK, FSK, and DPSK lightwave systems

Vodhanel, R.S.; Elrefaie, Aly F.; Iqbal, M. Zafar; Wagner, Richard E.; Gimlett, J.L.; Tsuji, S.

doi:10.1109/50.59168

Cited by 103 publications

(46 citation statements)

References 18 publications

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“…This scheme entered in the optical arena in the late 1980s, in the context of a research effort that took place at that time in order to use coherent detection techniques as a way to improve receiver sensitivity and hence transmission distance [1], [2]. However, the advent of erbium-doped fiber amplifiers refocused the interest on direct-detection techniques and, as a consequence, the possibility of using a Mach-Zehnder delay interferometer in conjunction with a dual-photodiode balanced receiver, to demodulate optical DPSK signals, started to attract attention [3]- [5]. In the last years, direct-detection DPSK has regained momentum aiming mainly dense wavelength division multiplexing (DWDM) long-haul transmission applications [6]- [8].…”

mentioning

confidence: 99%

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Pires

Cancela

2010

J. Lightwave Technol.

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Abstract-In-band crosstalk, due to multiple interferers, has been identified as one of the most severe impairments in optical transparent networks, especially in the ones with a large number of nodes and a high wavelength density. Due to its robustness to in-band crosstalk differential phase-shift keying (DPSK) emerges as an attractive modulation scheme to be used in such environments. This paper proposes a rigorous formulation to estimate the performance of direct-detection DPSK receivers using an eigenfunction expansion technique in the time domain. The method takes into account both the in-band crosstalk, due to an arbitrary number of interfering terms, and the amplified spontaneous emission noise and is able to deal with any combination of optical and electrical filter shapes. Using this method the accuracy of an approximation based on the wideband optical filtering assumption was evaluated and shown that the approximation, although not providing reliable results for the error probabilities, can be used with confidence to compute power penalties due to in-band crosstalk. Furthermore, the crosstalk tolerance of DPSK over on-off keying was quantified and shown that this tolerance is reduced when the number of interferers increases.Index Terms-Differential phase-shift keying, eigenvalues and eigenfunctions, in-band crosstalk, optical networking.

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mentioning

confidence: 99%

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Pires

Cancela

2010

J. Lightwave Technol.

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“…In this configuration, the OLT would need as many transmitters as served ONUs, but this configuration can be simplified combining several user downstream data by electrical subcarrier division multiplexing previous to its optical modulation by a high bandwidth I/Q modulator [6]. The ONU transmitter consists of a DFB, which is direct-phase-modulated using its chirp through a previously equalized signal [7]. The cost-effective DFB used for the measurements presents a relative wide linewidth, in the range of 10MHz.…”

Section: Methodsmentioning

confidence: 99%

“…The transmitted symbols in the OLT Digital Transmitter (DTX Di ) are filtered using a Nyquist Pulse Shaper filter with 12-symbols filter length and zero roll-off factor. The transmitted symbols generated in the ONU Digital Transmitter (DTX Ui ) are bipolar Non Return to Zero (NRZ) coded and high-pass filtered to obtain the phase modulation of the laser [7,10]. The DTX are implemented in MATLAB TM and the electrical signals are generated by a 12GSa/s Arbitrary Waveform Generator.…”

Section: Methodsmentioning

confidence: 99%

1Gbps full-duplex links for ultra-dense-WDM 625GHz frequency slots in optical metro-access networks

Altabás¹,

Izquierdo²,

Lazaro³

et al. 2016

Opt. Express

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1Gbps full-duplex optical links for 6.25GHz ultra dense WDM frequency slots are demonstrated and optimized for cost-effective metroaccess networks. The OLT-ONU downlinks are based on 1Gbps Nyquist-DPSK using MZM and single-detector heterodyne reception obtaining a sensitivity of −52dBm. The ONU-OLT uplinks are based on 1Gbps NRZ-DPSK by directly phase modulated DFB and also single-detector heterodyne reception obtaining same sensitivity of −52dBm. The power budget of full-duplex link is 43dB. These proposed links can provide service to 16 (32) users at each 100 (200) GHz WDM channel.

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“…The optical FSK modulation can be achieved simply by directly modulating the electrical current of a distributed feedback (DFB) or distributed Bragg reflector laser diode [7]. However, the drive current variation always results in a simulta- neous intensity modulation of the emitted light.…”

Section: Introductionmentioning

confidence: 99%

An optical FSK transmitter based on an integrated DFB laser-EA modulator and its application in optical labeling

Zhang

Chi

Holm-Nielsen

et al. 2003

IEEE Photon. Technol. Lett.

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Performance of directly modulated DFB lasers in 10-Gb/s ASK, FSK, and DPSK lightwave systems

Cited by 103 publications

References 18 publications

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

1Gbps full-duplex links for ultra-dense-WDM 625GHz frequency slots in optical metro-access networks

An optical FSK transmitter based on an integrated DFB laser-EA modulator and its application in optical labeling

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