Optical injection in semiconductor ring lasers: backfire dynamics

Gelens, Lendert; Beri, Stefano; Sande, Guy Van der; Danckaert, Jan; Calabretta, Nicola; Dorren, H.J.S.; Nötzel, R.; Bente, E.A.J.M.; Smit, M.K.

doi:10.1364/oe.16.010968

Cited by 17 publications

(5 citation statements)

References 17 publications

(25 reference statements)

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“…13) Unidirectional operation in nearly single-mode microring lasers has already been demonstrated. Control of the lasing direction was accomplished either with external optical injection 14) or special designs using selective electrical pumping. 15) Most recently a square ring=FP composite cavity laser, where deeply etched total internal reflector mirrors and a multimode interference (MMI) coupler were used to form a ring cavity and couple it with the FP cavity, was reported, 16) but the fabrication process was complex.…”

mentioning

confidence: 99%

Single-mode operation of GaAsP ring/Fabry–Perot composite cavity semiconductor lasers

Saha¹,

Uemukai²,

Suhara³

2015

Jpn. J. Appl. Phys.

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We designed and fabricated ring/Fabry–Perot composite cavity semiconductor lasers. Single-mode lasing under CW operation was accomplished. The threshold current was 140 mA, and an output power of 12 mW was obtained at an injection current of 250 mA. A side-mode suppression ratio (SMSR) higher than 25 dB was also obtained. The temperature coefficient of the lasing wavelength of 0.23 nm/°C was explained by considering the temperature coefficient of the bandgap energy of the quantum well.

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mentioning

confidence: 99%

Single-mode operation of GaAsP ring/Fabry–Perot composite cavity semiconductor lasers

Saha¹,

Uemukai²,

Suhara³

2015

Jpn. J. Appl. Phys.

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“…This is due to the OI enhancing the direction in which light is injected. 12,23 Finally, when E i 1 reaches a value of 0.13, a Hopf bifurcation is observed leading to oscillations in the CW and in the CCW intensity close to the relaxation oscillation frequency. Next, we increase the amount of IOF while the SRL is still subjected to OI.…”

Section: Srl Subject To Iof and Oi Simultaneouslymentioning

confidence: 94%

“…20 This makes SRLs interesting for some applications as optical memories 21 and random numbers generators. 22 But these SRLs are-similar to other semiconductor lasers-very sensitive to optical injection, [23][24][25] and therefore it is interesting to investigate schemes that can reduce this sensitivity. Using filtered optical feedback can possibly achieve this goal and is investigated in detail in this work.…”

Section: Introductionmentioning

confidence: 99%

Reducing the sensitivity of semiconductor ring lasers to external optical injection using selective optical feedback

Khoder

Sande

Verschaffelt

2018

Journal of Applied Physics

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We numerically investigate the influence of an integrated filtered optical feedback on the behavior of a semiconductor ring laser subject to external optical injection. The optical injection is spectrally directed at one of the non-lasing longitudinal modes of the laser. This so-called side-mode injection can cause wavelength switching, directional switching, and changes in the dynamical regime of the semiconductor ring laser. Such changes are often unwanted as they can affect the stability and the performance of the semiconductor ring laser. We investigate to what extent these undesired effects can be avoided by stabilizing the laser using on-chip filtered feedback. A two-directional mode model is used to investigate the dynamical behavior of the semiconductor ring laser under the simultaneous effect of the external optical injection and the integrated feedback. The results show that onchip filtered optical feedback can be used to reduce the sensitivity of the semiconductor ring laser to external optical injection.

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“…This necessitated the authors to use masks with duration of multiple delay times, which slows down the computation speed. Several other types of semiconductor laser have been considered such as semiconductor ring lasers using the two available directional modes [19][20][21][22][23][24][25][26] and vertical-cavity surface-emitting employing the two polarization modes [27][28][29][30] and multi-mode lasers employing longitudinal modes. 31 In this paper, we will only focus on single-mode Fabry-Péro type quantum-well semiconductor lasers.…”

Section: Introductionmentioning

confidence: 99%

Integrated photonic delay-lasers for reservoir computing

Sande

Harkhoe

Katumba

et al. 2020

Physics and Simulation of Optoelectronic Devices XXVIII

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Currently, multiple photonic reservoir computing systems show great promise for providing a practical yet powerful hardware substrate for neuromorphic computing. Among those, delay-based systems offer a simple technological route to implement photonic neuromorphic computation. Its operation boils down to a time-multiplexing with the delay length limiting the processing speed. As most optical setups end up to be bulky employing long fiber loops or free-space optics, the processing speeds are ranging from kSa/s to tens of MSa/s. Therefore, we focus on external cavities which are far shorter than what has been realized before in such experiments. We present experimental results of reservoir computing based on a semiconductor laser, operating in a single mode regime around 1550nm, with a 10.8cm delay line. Both are integrated on an active/passive InP photonic chip built on the Jeppix platform. Using 23 virtual nodes spaced 50 ps apart in the integrated delay section, we increase the processing speed to 0.87GSa/s. The computational performance is benchmarked on a forecasting task applied to chaotic time samples. Competitive performance is observed for injection currents above threshold, with higher pumps having lower prediction errors. The feedback strength can be controlled by electrically pumping integrated amplifiers within the delay section. Nevertheless, we find good performance even when these amplifiers are unpumped. To proof the relevance and necessity of the external cavity on the computational capacity, we have analysed linear and nonlinear memory tasks. We also propose several post-processing methods, which increase the performance without a penalty to speed.

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Optical injection in semiconductor ring lasers: backfire dynamics

Cited by 17 publications

References 17 publications

Single-mode operation of GaAsP ring/Fabry–Perot composite cavity semiconductor lasers

Single-mode operation of GaAsP ring/Fabry–Perot composite cavity semiconductor lasers

Reducing the sensitivity of semiconductor ring lasers to external optical injection using selective optical feedback

Integrated photonic delay-lasers for reservoir computing

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