Experimental demonstration of linewidth reduction of laser diode by compact coherent optical negative feedback system

Aoyama, Konosuke; Yoshioka, Ryuichi; Yokota, Nobuhide; Kobayashi, Wataru; Yasaka, Hiroshi

doi:10.7567/apex.7.122701

Cited by 13 publications

(4 citation statements)

References 12 publications

(15 reference statements)

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“…We previously proposed the optical negative feedback as a novel linewidth reduction scheme to realize a compact narrow-linewidth semiconductor laser. [24][25][26][27][28] The scheme does not require increasing the Q factor of the laser cavities. It requires only a single-mode semiconductor laser and an optical filter.…”

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confidence: 99%

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Aoyama

Kobayashi

Wada

et al. 2018

Appl. Phys. Express

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A compact narrow-linewidth semiconductor laser is demonstrated by hybridly integrating an optical filter constructed from Si waveguides with a single-mode semiconductor laser, whose spectral linewidth is narrowed through optical negative feedback. We design the optimum structure of a reflective ring filter for an optical negative feedback laser, and a narrow spectral linewidth of 160 kHz is realized by the hybridly integrated laser source whose effective device length is less than 1.5 mm.

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confidence: 99%

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Aoyama

Kobayashi

Wada

et al. 2018

Appl. Phys. Express

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“…Since then, various types of external cavity strong feedback structures for narrow linewidth semiconductor lasers have emerged. Through appropriate external cavity feedback methods, the coherent performance of lasers has been significantly improved, leading to the widespread application of semiconductor light sources [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Linewidth and Phase Noise Characteristics of a Narrow Linewidth External Cavity Diode Laser

Hu,

Lv,

Guan

et al. 2024

Sensors

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In the field of inter-satellite laser communication, achieving high-quality communication and compensating for the Doppler frequency shift caused by relative motion necessitate lasers with narrow linewidths, low phase noise, and the ability to achieve mode-hop-free tuning within a specific range. To this end, this paper investigates a novel external cavity diode laser (ECDL) with a frequency-selective F-P etalon structure, leveraging the external cavity F-P etalon structure in conjunction with an auxiliary filter to achieve single longitudinal mode selection. The laser undergoes linewidth testing using a delayed self-heterodyne beating method, followed by the testing of its phase noise and frequency noise characteristics using a noise analyzer, yielding beat spectra and noise power spectral density profiles. Furthermore, the paper introduces an innovative bidirectional temperature-scanning laser method to achieve optimal laser-operating point selection and mode-hop-free tuning. The experimental results showcase that the single longitudinal mode spectral side-mode suppression ratio (SMSR) is around 70 dB, and the output power exceeds 10 mW. Enhancing the precision of the F-P etalon leads to a more pronounced suppression of low-frequency phase noise, reducing the Lorentzian linewidth from the initial 10 kHz level to a remarkable 5 kHz level. The bidirectional temperature-scanning laser method not only allows for the selection of the optimal operating point but also enables mode-hop-free tuning within 160 pm.

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“…25,26) We experimentally demonstrated the linewidth reduction of a distributed feedback (DFB) laser from 6.4 MHz to 6.5 kHz using an FP optical filter as the frequency discriminator. 27) This method was shown to be effective even when a silicon-waveguide ring filter was used as the frequency discriminator in a hybrid integration configuration, 28,29) which shows promise as a compact narrow linewidth laser source. However, the characterization of FM noise power spectral density (PSD) under optical negative feedback, which is as important as spectral linewidth, has not been fully clarified yet.…”

Section: Introductionmentioning

confidence: 99%

Role of modulation bandwidth in narrow spectral linewidth semiconductor lasers under optical negative feedback

Yokota¹,

Kiuchi²,

Yasaka³

2020

Jpn. J. Appl. Phys.

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We investigated the FM noise characteristics of a distributed feedback laser under optical negative feedback from a Fabry–Perot optical filter using delayed self-homodyne coherent detection with a high-frequency range of 1 × 105–2 × 1010 Hz. The measured FM noise power spectral densities of the laser under the optical negative feedback strongly depend on the modulation responses of the laser. These results were reproduced in calculations based on a transfer function model. Our findings suggest that wide bandwidth semiconductor lasers are suitable for reducing FM noise in a wide frequency range and enhancing the feedback loop gain (FM noise reduction ratio) under a sufficient phase margin in optical negative feedback.

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Experimental demonstration of linewidth reduction of laser diode by compact coherent optical negative feedback system

Cited by 13 publications

References 12 publications

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Study on Linewidth and Phase Noise Characteristics of a Narrow Linewidth External Cavity Diode Laser

Role of modulation bandwidth in narrow spectral linewidth semiconductor lasers under optical negative feedback

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