Single contact monolithically integrated DFB laser amplifier

Sahara, R.; Salvatore, R.A.; Lu, H.

doi:10.1109/lpt.2002.1012378

Cited by 2 publications

(4 citation statements)

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“…Typically in studies, the theoretical threshold gain is calculated, and the difference between the highest and next-highest threshold gain (the gain margin) used as to estimate yield. 13 Here in our subthreshold analysis, the ratio of the heights of the two highest subthreshold mode near threshold (in a range around the Bragg peak) were used as a metric for single mode yield.…”

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

confidence: 99%

“…With some back‐facet phases, the spectra has a single dominant mode and produces a single mode device; with other random back‐facet phases, the spectra has several modes with similar gains, and thus result in devices with a low side‐mode suppression ratio. Typically in studies, the theoretical threshold gain is calculated, and the difference between the highest and next‐highest threshold gain (the gain margin) used as to estimate yield . Here in our subthreshold analysis, the ratio of the heights of the two highest subthreshold mode near threshold (in a range around the Bragg peak) were used as a metric for single mode yield.…”

Section: Yield Study On Partially Grated Devicesmentioning

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%

“…These devices were made up of a grated portion, for wavelength control and gain, and an ungrated portion which only provided gain. These structures have been seen to increase output, when used as an integrated amplifier, 13 and to increase optical feedback resistance, used within the cavity. 14 The devices tested had the ungrated region located towards the inner (high-reflectivity) side.…”

mentioning

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

confidence: 99%

Section: Yield Study On Partially Grated Devicesmentioning

confidence: 99%