Electro-absorption Modulated Lasers with High Immunity to Residual Facet Reflection by Using Lasers with Partially Corrugated Gratings

Pukhrambam, Puspa Devi; Lee, San‐Liang; Keiser, Gerd

doi:10.1109/jphot.2017.2669264

Cited by 10 publications

(12 citation statements)

References 27 publications

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“…As the un‐grated length begins to dominate the laser cavity, the laser becomes more Fabry‐Perot like, reducing the single mode yield. This result is consistent with recent reports that partial‐grated regions increase the robustness of the device to back‐reflections …”

Section: Yield Study On Partially Grated Devicessupporting

confidence: 93%

“…This result is consistent with recent reports that partialgrated regions increase the robustness of the device to backreflections. 9 We note that this calculation is only a proxy for the actual above-threshold single mode yield, based on the above-threshold side mode suppression ratio. It will likely reflect relative improvements with minor design changes; however, it will need to be carefully calibrated to a historical F IGUR E 5 Data and fit for quarter-wave shifted device F IGUR E 6 Expected yield with respect to increasing un-grated length in a partially grated index-coupleddistributed feedback lasers with jL 5 1.8 and 3.0 design, and to a consistent measurement condition, to realistically predict yields.…”

Section: Y Ie Ld S Tu Dy On P Arti Al Ly G Rate D Dev Ic Esmentioning

confidence: 99%

“…These variations on conventional distributed feedback devices have many potential advantages such as higher single mode yield, lower threshold and higher slope efficiency. [6][7][8][9][10] Distributed feedback lasers have been extensively modeled. However, relatively little work has been on modeling of multisegment devices, including both ungrated regions and quarter-wave shifts with grated regions.…”

Section: Introductionmentioning

confidence: 99%

“…8 It should be noted that some existing suboptimal sparse representation algorithms can be applied to determine the DOAs of multiple targets using the single measurement vector owing to their ability to resolve targets exploiting only a few snapshots and their robustness to the high correlation. [9][10][11][12][13][14][15] Among them, the orthogonal matching pursuit (OMP) is a representative algorithm that shows a relatively small estimation error in comparison with other greedy…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, asymmetric structures such as those with partial gratings or quarter wave shifts have been used. These variations on conventional distributed feedback devices have many potential advantages such as higher single mode yield, lower threshold and higher slope efficiency …”

Section: Introductionmentioning

confidence: 99%

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Modeling of yield, slope efficiency, and spectra of multisegment distributed feedback lasers

Hong

Khinda

Jules

et al. 2017

Micro & Optical Tech Letters

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The properties and yield of a distributed feedback laser depends on the values of coupling coefficient j and many other parameters. Multisegmented distributed feedback devices (consisting of grated and ungrated areas, quarterwave-shifts, and potentially other features other) are becoming more common and have advantages over uniform grated devices. A multi-segmented transfer matrix model is used to model the spectra, yield, and slope efficiency of multisegment and uniform distributed feedback lasers. The results give an excellent match to measured spectra of partially grated, quarter-wave-shifted, and uniform devices, and qualitatively agree with experimental data on the distribution of slope efficiency in devices. A study on partial grated devices suggested they may have advantages in single mode yield compared to uniformly grated devices. This method (and the specific software tool Glaparex) can be used to control device parameters in manufacturing and to optimize laser designs design.distributed feedback devices, semiconductor device modeling, semiconductor lasers | I NT RODU CTI ONDistributed feedback laser parameters, such as index and gain coupling coefficients, j, play a critical role in determining the performance characteristics such as threshold current and slope efficiency. The randomly varying back-facet phase in conjunction with these parameters determines the single mode yield, slope efficiency, and wavelength. Since the first basic description of distributed feedback lasers by Kogelnick and Shank, 1 many authors have presented methods for modeling distributed laser structures. [2][3][4][5] In recent years, asymmetric structures such as those with partial gratings or quarter wave shifts have been used. These variations on conventional distributed feedback devices have many potential advantages such as higher single mode yield, lower threshold and higher slope efficiency. 6-10Distributed feedback lasers have been extensively modeled. However, relatively little work has been on modeling of multisegment devices, including both ungrated regions and quarter-wave shifts with grated regions. In this article, we model some of these asymmetric structures using our publicly available software tool, GLaparex.11 The basic fit of several different sorts of conventional uniform and multisegment distributed feedback lasers is modeled and demonstrated to be consistent by comparison to experimental results. Then, yield and slope efficiency of some sample designs are explored. This extension to conventional models allows variations on a design to be investigated to maximize total yield, including DC characteristics and side mode suppression ratio.In this article, we also describe our publicly available software tool, Glaparex, with which our analysis has been done. This tool has a graphical user interface, supports multisegment structures and facilitates high quality and rapid analysis. | M ODE L P ARA MET ERSThe technique used to calculate the spectra builds on the transfer matrix calculation of the basic sp...

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Section: Yield Study On Partially Grated Devicessupporting

confidence: 93%

Section: Y Ie Ld S Tu Dy On P Arti Al Ly G Rate D Dev Ic Esmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling of yield, slope efficiency, and spectra of multisegment distributed feedback lasers

Hong

Khinda

Jules

et al. 2017

Micro & Optical Tech Letters

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Improvement on Direct Modulation Responses and Stability by Partially Corrugated Gratings Based DFB Lasers With Passive Feedback

2021

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DFB lasers with ultrashort cavities or integrated DFB lasers with passive waveguide reflectors are frequently proposed to realize directly modulated lasers (DMLs) for carrying ultrahigh data rate signals. The former suffers from poor heatsink and laser cleavage yield, while the single-mode stability of the latter scheme is seldom addressed. The mode selection and device performance of a DFB laser is well known to be very sensitive to the facet reflection and external optical feedback. The DFB lasers with partial corrugated gratings and passive feedback (PCG-PFL) are proposed here to overcome the challenging issues for the aforementioned two schemes. With PCG structure, the DFB lasers can maintain high single-mode yield (SMY) even with a high-reflection-coating on the rear facet and strong reflection from the integrated passive section. This provides the robustness in applying the integrated passive reflector to reshape the modulation response or to enhance the 3-dB bandwidth by using the photon-photon resonance (PPR) effect. By designing the PCG-PFL to have 150-m long laser section, 50-m long passive section, and 30% front-facet reflectivity, it can have about 86% of SMY, reduced resonant peak in the intensity modulation response, and reduced waveform overshoot and undershoot for transmitting 56-Gbaud/s PAM-4 signals. By using a longer passive reflector, enhanced bandwidth can be achieved by the PPR effect.

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Low-Frequency-Drop of Electroabsorption Modulated Lasers and the Improvement With Partially Corrugated Grating Based DFB Lasers

et al. 2022

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Electro-absorption Modulated Lasers with High Immunity to Residual Facet Reflection by Using Lasers with Partially Corrugated Gratings

Cited by 10 publications

References 27 publications

Modeling of yield, slope efficiency, and spectra of multisegment distributed feedback lasers

Modeling of yield, slope efficiency, and spectra of multisegment distributed feedback lasers

Improvement on Direct Modulation Responses and Stability by Partially Corrugated Gratings Based DFB Lasers With Passive Feedback

Low-Frequency-Drop of Electroabsorption Modulated Lasers and the Improvement With Partially Corrugated Grating Based DFB Lasers

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