1.3 μm low cost plastic module for 622 Mbit/s transmission at 85°C

Fernier, B.; Adam, K.; Artigue, C.; Goth, A.; Grard, E.; Weller, Jörg; Keller, D.; Lafragette, J.-L.; Lestra, A.; Pagnod, P.; Rabaron, S.; Rainsant, J.M.; Scherb, J.; Toullier, D.; Trégoat, Denis; Rehm, W.

doi:10.1109/ecoc.1998.732648

Cited by 15 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the performance of most single-mode semiconductor lasers is strongly altered by any source of external optical feedback [14], which normally necessitates the use of optical isolators that dramatically increases the transmitter cost. Single-mode laser diodes that provide substantially enhanced immunity to optical feedback are therefore highly desirable as they may eliminate the need and additional cost of optical isolators [15]. Nevertheless, the laser sensitivity to optical feedback can be such that, even under very weak feedback level, the laser becomes unstable and starts operating within the so-called coherence collapse regime [16].…”

Section: Transmission Characteristicsmentioning

confidence: 99%

Discrete mode lasers for communications applications

et al. 2009

View full text Add to dashboard Cite

The wavelength spectra of ridge waveguide Fabry Perot lasers can be modified by perturbing the effective refractive index of the guided mode along very small sections of the laser cavity. One way of locally perturbing the effective index of the lasing mode is by etching features into the ridge waveguide such that each feature has a small overlap with the transverse field profile of the unperturbed mode, consequently most of the light in the laser cavity is unaffected by these perturbations. A proportion of the propagating light is however reflected at the boundaries between the perturbed and the unperturbed sections. Suitable positioning of these interfaces allows the mirror loss spectrum of a Fabry Perot laser to be manipulated. In order to achieve single longitudinal mode emission, the mirror loss of a specified mode must be reduced below that of the other cavity modes. Here we review the latest results obtained from devices containing such features. These results clearly demonstrate that these devices exceed the specifications required for a number of FTTH and Datacomms applications, such as GEPON, LX4 and CWDM. As well as this we will also present initial results on the linewidth of these devices.

show abstract

Section: Transmission Characteristicsmentioning

confidence: 99%

Discrete mode lasers for communications applications

et al. 2009

View full text Add to dashboard Cite

show abstract

“…with z being the longitudinal coordinate, P the photon number inside the cavity, and the phase of the electrical field. In (1) and (2), is the free-running laser frequency, is the lasing frequency in the presence of optical feedback, is the amplitude reflectivity of the external optical feedback coming from a distant reflecting point and being assumed to be such as , is the external round-trip time (with the external cavity length), is the complex electrical field defined as , and are the Langevin forces in the time domain, and is the carrier density deviation induced by the external optical feedback. As it has been previously mentioned, longitudinal variations such as those on internal optical power are taken into account through the integral terms over the cavity length L. On the other hand, it is important to stress that expressions of , , and given by (3), (4), and (5) are linked to the Wronskian that comes as a consequence of the resolution of the wave equation for the electromagnetic field [12].…”

Section: A Generalization Of the Rate Equations Including External Omentioning

confidence: 99%

“…While wafer fabrication techniques allow massive production, packaging remains a cost bottleneck, as it is not supported by parallel processing. Cost reduction must therefore be based on packaging simplification, such as flip-chip bonding and direct coupling of the laser into the fiber [2]. However, in order to realize an optical module without an optical isolator, the design of feedback resistant lasers continues to remain a challenge.…”

mentioning

confidence: 99%

On the Effects of an Antireflection Coating Impairment on the Sensitivity to Optical Feedback of AR/HR Semiconductor DFB Lasers

Grillot

2009

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

International audienceThe sensitivity to optical feedback of 1.55- mum antireflection (AR)/high-reflection (HR) DFB semiconductor lasers is presented in this paper. The onset of the coherence collapse, which is the most critical feedback regime for optical transmissions, is theoretically investigated with a stress on its dependence with facet phase effects (FPEs). Taking into account FPEs on both facets, the sensitivity to optical feedback is evaluated with respect to both the coupling strength coefficient and the feedback level. The first part of the paper shows that due to the HR-facet, a distribution up to several decibels on the coherence collapse thresholds is predicted over the whole DFB laser population. The second part concentrates on the coherence collapse dependence with respect to the AR coating. Calculations show an enhancement of the coherent collapse threshold distribution up to 10 dB due to the AR coating impairment. These simulations are of first importance for optical transmissions since they show that for AR coatings beyond 10-4, the sensitivity to optical feedback of AR/HR DFB lasers is extremely difficult to evaluate from one laser to another. On the other hand, for AR coatings below 10-4, all feedback performances are directly connected to the laser wavelength, and DFB lasers can be easily selected for high bit rate isolator-free transmission

show abstract

“…While wafer fabrication techniques allows massive production, packaging remains a cost bottleneck, as it is not supported by parallel processing. Cost reduction must therefore be based on packaging simplification, such as flip-chip bonding and direct coupling of the laser to the fiber [2]. However, in order to realize an optical module without optical isolator, the design of feedback resistant lasers continues to remain a challenge.…”

Section: Introductionmentioning

confidence: 99%

Facet phase effects on the coherence collapse threshold of 1.55 μm AR/HR distributed feedback semiconductor lasers

Grillot

Thédrez

2006

SPIE Proceedings

View full text Add to dashboard Cite

The sensitivity to optical feedback of 1.55 µm AR/HR distributed feedback semiconductor lasers (DFB) is presented in this paper. The onset of the coherence collapse which is the most critical feedback regime for optical transmissions is theoretically investigated and with a stress on its dependence with facet phase effects (FPE). Taking into account FPE on both facets, the sensitivity to optical feedback is evaluated with respect to both the coupling strength coefficient and the feedback level. The first part of the paper shows that due to the HR-facet, a distribution up to several dB on the coherence collapse thresholds is predicted over the whole DFB laser population. The second part concentrates on the coherence collapse dependence with respect to the antireflection (AR) coating. Calculations show an enhancement of the coherent collapse threshold distribution up to 5 dB due to AR coating impairment. Those simulations are of first importance for optical transmissions since they show that for AR coatings beyond 10 -4 , the sensitivity to optical feedback of AR/HR DFB lasers is extremely difficult to evaluate from a laser to another. On the other hand, for AR coatings below 10 -4 , all feedback performances are directly connected to the laser wavelength and lasers can be selected for high bit rate isolator-free transmission.

show abstract

1.3 μm low cost plastic module for 622 Mbit/s transmission at 85°C

Cited by 15 publications

References 3 publications

Discrete mode lasers for communications applications

Discrete mode lasers for communications applications

On the Effects of an Antireflection Coating Impairment on the Sensitivity to Optical Feedback of AR/HR Semiconductor DFB Lasers

Facet phase effects on the coherence collapse threshold of 1.55 μm AR/HR distributed feedback semiconductor lasers

Contact Info

Product

Resources

About