Yield analysis of SLM DFB lasers with an axially-flattened internal field

Kinoshita, Junichi; Matsumoto, K

doi:10.1109/3.29264

Cited by 58 publications

(21 citation statements)

References 11 publications

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“…16 Since the gain-coupled DFB laser is free from this severe restriction on r, 4-7 the present work also evaluated the influence of r on J th . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Threshold current of quantum-disk and quantum-wire gain-coupled distributed feedback lasers

Susa

1998

Journal of Applied Physics

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This numerical study shows that an effective way to reduce the threshold current density (Jth) in the quantum well (QW) and bulk types of gain-coupled distributed feedback (DFB) lasers is to reduce the active volume. Although the threshold current per unit cavity width (Ith) is smaller for the quantum-disk type than it is for the quantum-wire or QW type of gain-coupled DFB laser, both the optimum number of vertically stacked quantum structures (Nst) for minimizing Ith when cavity length (L) is fixed and the optimum L for minimizing Ith when Nst is fixed are the largest for the quantum-disk type. When L=500 μm, for example, the optimum Nst is 7 for the quantum-disk type, 5 for the quantum-wire type and 3 for the QW type. Threshold current density (Jth) is almost independent of facet reflectivity (r), and this implies that all these lasers oscillate at the Bragg mode. The Jth of the bulk laser, however, is influenced most by r because this type has the smallest differential gain.

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“…16 Since the gain-coupled DFB laser is free from this severe restriction on r, 4-7 the present work also evaluated the influence of r on J th . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Threshold current of quantum-disk and quantum-wire gain-coupled distributed feedback lasers

Susa

1998

Journal of Applied Physics

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“…1b. The lasers with a phase-shift section exhibit high yield for perfect AR coatings but the yield is decreased significantly when the facet reflectivities are increased just a few percent (Kinoshita and Matsumoto 1989). In the absence of the phase-shift section the π/2 phase-shift can be introduced by high-reflection (HR) and AR coatings (Henry 1985).…”

Section: Analysis Of the Round-trip Gain Selectivitymentioning

confidence: 98%

Laterally-corrugated ridge-waveguide distributed feedback lasers at 980 nm

et al. 2009

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The paper presents a simulation-based analysis of laterally-corrugated ridgewaveguide distributed feedback semiconductor lasers emitting at 980 nm. The simulations were performed using software developed in-house and the PICS3D software package from Crosslight Software Inc. The effects of the corrugation geometry, phase-shift section, and mirror reflectivities on single longitudinal mode operation are discussed. The lasers, designed along the guidelines derived from the simulation results, were fabricated by using molecular beam epitaxy for wafer growth and low-cost nano-imprint lithography. They exhibited stable single-mode operation with up to 50 dB side-mode suppression ratio.

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“…The threshold gain increases from 3.3 for the rectangular grating to 4.1 for the rounded grating where h 3 = 0.2 µm, an increase of >20%. For sufficient side-mode suppression, it is necessary to have NGD > 0.2 (Kinoshita and Matsumoto 1989), a condition that is met when h 3 > 0.14 µm, and therefore satisfied by the grating of Fig. 3a.…”

Section: Analysis Of Grating Roundingmentioning

confidence: 98%

Effects of grating order and tooth rounding in laterally coupled distributed feedback lasers

et al. 2008

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We demonstrate the results of an analysis of laterally coupled distributed feedback (LC-DFB) lasers with higher order gratings, including the effects of radiating partial waves. For a given fabrication resolution, first-order gratings, if they can be reliably manufactured, always provide the strongest coupling. However, at resolutions requiring higher order gratings, if duty cycles of >0.5 are used, the lowest grating order is not always the one with the strongest coupling. An analysis of the rounding of the grating teeth showed that the required threshold gain was increased by nearly 20% when the rectangular grating was rounded in fabrication.

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Yield analysis of SLM DFB lasers with an axially-flattened internal field

Cited by 58 publications

References 11 publications

Threshold current of quantum-disk and quantum-wire gain-coupled distributed feedback lasers

Threshold current of quantum-disk and quantum-wire gain-coupled distributed feedback lasers

Laterally-corrugated ridge-waveguide distributed feedback lasers at 980 nm

Effects of grating order and tooth rounding in laterally coupled distributed feedback lasers

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