Experimental investigation of the signal degradation in WDM transmission through coherent crosstalk caused by a fast tunable SG-DBR laser

Puttnam, Benjamin J.; Dueser, Michael; Bayvel, Polina

doi:10.1109/ofc.2005.192827

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…Results in Fig. 10 agree with the experimental measurements reported in [7]. The influence of these wavelength variations on the laser's use for OBS applications was also investigated in [7], they may cause crosstalk to adjacent WDM channels and increase the bit-error rate of WDM signals.…”

Section: Thermally Induced Wavelength Drifts Of the Lasersupporting

confidence: 83%

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Dynamic Modeling of PID Temperature Controller in a Tunable Laser Module and Wavelength Transients of the Controlled Laser

2012

IEEE J. Quantum Electron.

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Temperature controllers based on proportionintegration-differentiation (PID) control strategy are widely used in tunable semiconductor laser modules for optical communication systems. A properly designed temperature controller (consisting of a thermoelectric cooler, a thermistor, and control circuits) can maintain a nearly constant laser temperature regardless of the variation of environment temperature (−20°C to 70°C). However, it cannot avoid the thermal transients arising from fast changes of tuning-section currents in fast wavelengthswitching applications. In these cases, the behavior of the thermal transients in the laser is closely related to characteristics of the temperature controller. In this paper, a dynamic 3-D thermal model of a packaged sampled grating distributed Bragg reflector (SG-DBR) laser module containing a PID temperature controller is presented. This model is based on finite element method. It can simulate the dynamic working process of the temperature controller when the laser is wavelength-switched by current change and the corresponding transient temperature in the laser chip. Transient temperature variations and wavelength drifts of the SG-DBR laser after switching for different PID coefficients are simulated and discussed. Wavelength stabilization times and their influences on the laser's actual application in dynamic optical networks are also discussed.Index Terms-Dynamic optical networks, modeling and simulation, proportion-integration-differentiation (PID) temperature controller, sampled grating distributed Bragg reflector (SG-DBR) laser module, thermal transient, wavelength drift.

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Section: Thermally Induced Wavelength Drifts Of the Lasersupporting

confidence: 83%

“…The transient temperature variation in the laser chip is related to the working process of the temperature controller. These transient temperature variations will induce wavelength drifts after current tuning [5], [6], which have a significant impact on such device's applications where the time scale for each burst is relatively large [7].…”

mentioning

confidence: 99%

Dynamic Modeling of PID Temperature Controller in a Tunable Laser Module and Wavelength Transients of the Controlled Laser

2012

IEEE J. Quantum Electron.

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“…The group has identified the suitability of multisection tuneable lasers, and has carried out detailed experimental studies of sampled-grating distributed Bragg reflector (SG-DBR) lasers for this application. A potential problem which has to be overcome is the thermally induced wavelength drift following wavelength switching [20]. If this is not minimised, crosstalk between WDM channels can occur.…”

Section: Experimental Studies Of Obsmentioning

confidence: 99%

Optical networks research at UCL

Appathurai¹,

Benlachtar²,

Duce³

et al. 2006

BT Technol J

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New dynamic optical switching technologies and adaptive transmission techniques will allow increased capacity and flexibility in future core and metro networks. The Optical Networks Group at UCL has carried out research focused on these areas, in collaboration with industry and other university research groups, for over a decade. In this paper, the technical challenges to be overcome in implementing dynamic, high-capacity networks are discussed, and recent results of the group's work are presented. New network architectures based on wavelength-routing and optical burst switching have been proposed and analysed, and the experimental demonstration of burst switching using fast wavelength-tunable lasers is described. High-capacity dense wavelength division multiplexed transmission systems, using advanced regeneration and equalisation techniques, have been studied, both theoretically, and experimentally using a dynamically reconfigurable recirculating fibre loop. Research results on advanced optical signal formats, all-optical 3R regeneration at 40 Gbit/s channel rates, adaptive analogue and digital electronic processing techniques and optical finite impulse response equalisation are presented. Finally, the development of optical performance monitoring technology, a key component of future all-optical networks, is described. The paper concludes with a prediction of future trends in optical communications research.

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“…Another consequence of the large current changes required for wide wavelength tuning range is heating of the device. Thermal effects cause significant wavelength drifts of microsecond timescales, which can degrade system performance [13], [14]. An alternative way to induce refractive index changes in the laser cavity is by applying a reverse bias to the tuning sections and utilizing field effects such as the Franz-Keldysh (FK) and the quantum-confined Stark effect (QCSE).…”

Section: Introductionmentioning

confidence: 99%

Fast Tuneable InGaAsP DBR Laser Using Quantum-Confined Stark-Effect-Induced Refractive Index Change

Pantouvaki

Renaud

Cannard

et al. 2007

IEEE J. Select. Topics Quantum Electron.

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Abstract-We report a monolithically integrated InGaAsP DBR ridge waveguide laser that uses the quantum-confined Stark effect (QCSE) to achieve fast tuning response. The laser incorporates three sections: a forward-biased gain section, a reverse-biased phase section, and a reverse-biased DBR tuning section. The laser behavior is modeled using transmission matrix equations and tuning over ∼8 nm is predicted. Devices were fabricated using postgrowth shallow ion implantation to reduce the loss in the phase and DBR sections by quantum well intermixing. The lasing wavelength was measured while varying the reverse bias of the phase and DBR sections in the range 0 V to <−2.5 V. Tuning was noncontinuous over a ∼7-nm-wavelength range, with a side-mode suppression ratio of ∼20 dB. Coupled cavity effects due to the fabrication method used introduced discontinuities in tuning. The frequency modulation (FM) response was measured to be uniform within ±2 dB over the frequency range 10 MHz to 10 GHz, indicating that tuning times of 100 ps are possible.Index Terms-Integrated optics, ion implantation, laser tuning, quantum-confined Stark effect (QCSE), quantum well intermixing (QWI), tuneable semiconductor lasers.

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Experimental investigation of the signal degradation in WDM transmission through coherent crosstalk caused by a fast tunable SG-DBR laser

Cited by 7 publications

References 6 publications

Dynamic Modeling of PID Temperature Controller in a Tunable Laser Module and Wavelength Transients of the Controlled Laser

Dynamic Modeling of PID Temperature Controller in a Tunable Laser Module and Wavelength Transients of the Controlled Laser

Optical networks research at UCL

Fast Tuneable InGaAsP DBR Laser Using Quantum-Confined Stark-Effect-Induced Refractive Index Change

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