Advanced InP laser technologies for 400G and beyond hyperscale interconnections

Naoe, Kazuhiko; Nakajima, Takayuki; Nakai, Yoshikazu; Yamaguchi, Yoriyoshi; Sakuma, Yasushi; Sasada, Noriko

doi:10.1117/12.2560165

Cited by 7 publications

(5 citation statements)

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“…Therefore, the laser structure that has a greater integration value of the product of forward and backward waves over the cavity will have a smaller |𝐶 𝐿 | provide that the output power is held constant. The 𝐶 𝐿 value can also be derived from the lasing condition equation, equation (5) in Ref. [24], [28], for the PCG-DFB.…”

Section: Structurementioning

confidence: 99%

“…The preliminary guideline for EMLs to support 200-Gb/s per lane are having a high bandwidth of 42-GHz to 55-GHz from the integrated electroabsorption modulator (EAM) and the use of PAM-4 or PAM-6 formats [4]. Recently, the uncooled 53-Gbaud/s PAM-4 operation using an InGaAsP-MQW EML was demonstrated with a low driving voltage of 0.9-V peak-to-peak voltage (Vpp) [5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2022

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Section: Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Direct modulated Distributed Feedback (DFB) lasers with modulation speed beyond 100 Gb/s has already been achieved. [1][2][3] In order to increase the single-mode production yield of DFB lasers, common schemes include: end-surface coating, 4 λ/4 phase-shifted gratings, 5 and passive feedback waveguide. 6 The introduction of λ/4 phase-shifted gratings may induce strong spatial hole burning due to uneven distribution of carrier consumption in the laser cavity, leading to laser performance degradation.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of distributed feedback laser with a partial grating

Wei

Wang

Shi

et al. 2022

Semiconductor Lasers and Applications XII

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Distributed Feedback (DFB) lasers that are widely used in high-speed communication nowadays usually use end-facet strategy coating in order to seek a balance between fabrication difficulty and device performance. This paper investigates DFB lasers with a partial grating structure that is immune to the phase uncertainties at the end-facet with high-reflection (HR) film and the improvement of its output chirp characteristics. It is found that, after parameter optimization, the carrier concentration and photon density distribution along the partial grating DFB (PG-DFB) laser cavity can be more uniform, which helps to obtain a better production yield. In addition, a compromised choice of the length of grating region and waveguide region can ensure stable single-mode output, as well as sub-10 mA threshold and high slope efficiency (SE). We also find that the PG-DFB laser can reduce the transient chirp by about 5 GHz compared to conventional DFB laser with a uniform grating.

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“…The distributed feedback (DFB) lasers has the potential to provide the required bandwidth for carrying >100-Gb/s signals [1][2][3].To achieve 100-Gb/s per channel transmission with 4-level pulse amplitude modulation (PAM-4), the required transmitter bandwidth is 31-GHz [4], which has been demonstrated by several groups for direct modulation of DFB lasers. The techniques to accomplish ultrahigh-speed modulation for DMLs can be classified into two categories: pure carrier-photon resonance (CPR) type and photon-assisted type.…”

Section: Introductionmentioning

confidence: 99%

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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Advanced InP laser technologies for 400G and beyond hyperscale interconnections

Cited by 7 publications

References 0 publications

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

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

Performance enhancement of distributed feedback laser with a partial grating

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

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