Optimum parameters controlling distortion and noise of semiconductor laser under analog multichannel modulation

Mahmoud, Alaa; Ahmed, Moustafa; Mahmoud, Safwat W. Z.

doi:10.1007/s12043-018-1552-y

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Optical communications started to revolutionize the industry of communication in the 1980s when low-loss optical fibers were introduced, which quickly became the favored medium for applications of high-capacity and long transmission lines (Sharma & Gupta). Recently, there has been a lot of interest in radio over fiber RoF technology as a way to merge wireless and optical systems to enhance communication bandwidth and keep up with integrated services (Llorente et al, 2011). The most common applications of wireless communications are the wireless local area networks (WLAN) and the distributed antenna systems (DAS) for in-building coverage in cellular systems (Wake, 2002), as well as satellite communication (Way et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

An overview of recent studies on the limitations of semiconductor lasers under direct modulation for use in analog RoF systems

Abd El-Salam,

Mahmoud,

Mohamed

2024

Laser Innovations for Research and Applications

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Radio-over-fiber (RoF) systems have recently attracted a lot of attention as a way to integrate wireless and optical systems to enhance communication capacity and keep up with high-speed transmission services. Semiconductor lasers (SLs) play an important role in the development of analog RoF systems due to their high bandwidth. However, when the SL is directly modulated by RF signals simultaneously, the electron and photon densities in the active region are subject to nonlinear transfer characteristics. This generates undesirable distortion products and high-intensity noise in the modulated laser signal, which degrade the signal quality. The review introduces an overview of recent studies on the signal distortions and intensity noise induced by two-tone direct intensity modulation of a semiconductor laser for use in analog RoF systems.

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Section: Introductionmentioning

confidence: 99%

An overview of recent studies on the limitations of semiconductor lasers under direct modulation for use in analog RoF systems

Abd El-Salam,

Mahmoud,

Mohamed

2024

Laser Innovations for Research and Applications

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“…They have analyzed the dynamics and noise of semiconductor laser communication systems for optical access television communication systems [1][2][3][4][5][6][7]. The typical frequency spectra of relative intensity noise are studied with modulation.…”

Section: Introductionmentioning

confidence: 99%

“…The total of carrier to noise ratio of semiconductor laser is estimated for fiber access communication television. Optimum noise and distortion of semiconductor laser are covered [2,3]. They have proposed the modulation semiconductor laser amplifier response by using optiwave simulation.…”

Section: Introductionmentioning

confidence: 99%

The key management of direct/external modulation semiconductor laser response systems for relative intensity noise control

Eid

Seliem

Rashed

et al. 2021

IJEECS

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<p><span>This study outlines the management of either direct or external modulation semiconductor laser systems for the key solution of bit rate up to 25 Gb/s under relative intensity noise (RIN) control. The bias and modulation peak currents based laser rate equations are optimized to achieve max Q factor and min bit error rate (BER) using first proposed model and optical/electrical signal power, optical/electrical signal to noise ratio are also enhanced using second proposed model. The percentage enhancement ratio in max. Q-factor and min. BER using first proposed model ranges from 53.25 % to 71.63 % in compared to the previous model. In the same way, by using second proposed model, the electrical signal power at optical receiver is enhanced within the range of 48.66 % to 68.88 % in compared to the previous model. Optical signal/noise ratio (OSNR) after optical fiber cable (OFC), signal/noise ratio (SNR) after electrical filter are measured with using different electrical pulse generators and electrical modulators at the optimization stage. The first proposed model reported better max. Q and min. BER values than the previous model. In addition to the second proposed model (direct modulation) has outlined better optical/electrical signal power than the previous model, while max. Q, min. BER values are kept constant. It is found that non return to zero pulse generator has presented better signal power than other pulse generators by using second proposed model. As well as the mixed of raised cosine pulse generator with external modulator reported max. Q, min. BER with other pulse generators by using first proposed model. OSNR at OFC is optimized by using continuous phase frequency shift keying (CPFSK) electrical modulator, While SNR at optical receiver is optimized by using phase shift keying (PSK) electrical modulator.</span></p>

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Modelling and characterisation of the noise characteristics of the vertical cavity surface-emitting lasers subject to slow light feedback

et al. 2019

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Optimum parameters controlling distortion and noise of semiconductor laser under analog multichannel modulation

Cited by 5 publications

References 21 publications

An overview of recent studies on the limitations of semiconductor lasers under direct modulation for use in analog RoF systems

An overview of recent studies on the limitations of semiconductor lasers under direct modulation for use in analog RoF systems

The key management of direct/external modulation semiconductor laser response systems for relative intensity noise control

Modelling and characterisation of the noise characteristics of the vertical cavity surface-emitting lasers subject to slow light feedback

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