Timing jitter reduction of gain-switched DFB laser by external injection-seeding

Seo, Dongsun; Kim, Dug Y.; Liu, Haifeng

doi:10.1049/el:19960019

Cited by 51 publications

(19 citation statements)

References 6 publications

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“…The lower values corresponded to a master laser completely tuned to the slave emission frequency, and symmetrical detunings around the zero value gave the same results for the PDF of turn-on times. Experimental verification of this behavior as a function of the frequency detuning has been reported in agreement with the theoretical results [31], [32]. Additional experimental observations were a linear increase in the SMSR and pulse broadening, specially noticeable at high injection levels.…”

Section: Jitter and Dynamical Lockingsupporting

confidence: 85%

Frequency dynamics of gain-switched injection-locked semiconductor lasers

Dellunde

Torrent

Sancho

et al. 1997

IEEE J. Quantum Electron.

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Abstract-The frequency dynamics of gain-switched singlemode semiconductor lasers subject to optical injection is investigated. The requirements for low time jitter and reduced frequency chirp operation are studied as a function of the frequency mismatch between the master and slave lasers. Suppression of the power overshoot, typical during gain-switched operation, can be achieved for selected frequency detunings.

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Section: Jitter and Dynamical Lockingsupporting

confidence: 85%

Frequency dynamics of gain-switched injection-locked semiconductor lasers

Dellunde

Torrent

Sancho

et al. 1997

IEEE J. Quantum Electron.

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“…Short optical pulses with small timing jitter are desirable as data signals in high-frequency optical communication systems. Timing jitter reduction has been achieved by using optical injection in gain-switched DFB lasers [8]- [9]. A similar study has been recently considered in VCSELs in a theoretical way [10].…”

Section: Introductionmentioning

confidence: 91%

Optical injection-induced timing jitter reduction in gain-switched single-mode vertical-cavity surface-emitting lasers

et al. 2010

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We report an experimental and theoretical investigation of the effect of optical injection on the characteristics of optical pulses generated by gain-switching a 1550 nm single transverse mode vertical-cavity surface-emitting laser (VCSEL). Under continuous wave operation the VCSEL emits in a linear polarization along the whole current range. The experimental analysis of the effect of external optical injection on the timing jitter, maximum power, and pulse width of optical pulses generated by gain-switching the single mode VCSEL is performed for several repetition rates and for different values of the detuning between the frequency of the optical injection and the VCSEL. Experimental results show that for 1 GHz repetition frequency, jitter reductions greater than 70 % can be obtained over a 47 GHz frequency detuning range with a slight increase of 22% in pulse width with respect to the solitary case. A clear anticorrelation between the maximum power and pulse width is also obtained. A theoretical study is also performed by using a model that incorporates both spatial dependence of carrier density and optical field profiles. The two polarization modes are also taken into account in the model. The theoretical results are in good agreement with the experimental results.

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“…The physical mechanisms underlying this improved performance are frequency locking to the master source and suppression of relaxation oscillations. During gain-switched and current modulated operation, the optically injected semiconductor laser shows a reduced time jitter and a considerably lower frequency chirp than the free-running laser [28]- [34]. These effects are beneficial and, in fact, several experimental setups have successfully implemented injection-locked devices in the above described way [26], [27], [35].…”

mentioning

confidence: 99%

“…The standard injection-locking technique assumes a stabilized master oscillator [29]- [31], [33], [34]. Efforts have been made to thermally stabilize the master output including electronic feedback loops.…”

mentioning

confidence: 99%

“…The turn-on process of the slave laser is thus triggered by the external seed supplied by the master source, instead of spontaneous emission events present in the active region of the slave [32]. The external seeding process forces an early turn on, reducing the time jitter but also leading to broader output pulses with a lower power peak, because the turn on occurs when the net gain is low [33], [34]. This drawback of the standard injection-locking technique puts limitations on the generation of optical pulses for multiplexing purposes in the time domain.…”

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confidence: 99%

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Generator of ultrashort optical pulses for time division multiplexing

Dellunde

Mirasso²,

Torrent³

et al. 1998

IEEE Trans. Electron Devices

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Abstract-The performance of a device based on modified injection-locking techniques is studied by means of numerical simulations. The device incorporates master and slave configurations, each one with a DFB laser and an electroabsortion modulator (EAM). This arrangement allows the generation of high peak power, narrow optical pulses according to a periodic or pseudorandom bit stream provided by a current signal generator. The device is able to considerably increase the modulation bandwidth of free-running gain-switched semiconductor lasers using multiplexing in the time domain. Opportunities for integration in small packages or single chips are discussed.

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Timing jitter reduction of gain-switched DFB laser by external injection-seeding

Cited by 51 publications

References 6 publications

Frequency dynamics of gain-switched injection-locked semiconductor lasers

Frequency dynamics of gain-switched injection-locked semiconductor lasers

Optical injection-induced timing jitter reduction in gain-switched single-mode vertical-cavity surface-emitting lasers

Generator of ultrashort optical pulses for time division multiplexing

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