Widely Tunable Distributed Feedback Semiconductor Lasers with Constant Power and Narrow Linewidth

Qi, 王琪 Wang; Jinjin, 郭锦锦 Guo; Wei, 陈伟 Chen; Jianguo, 刘建国 Liu; Ninghua, 祝宁华 Zhu

doi:10.3788/cjl201744.0101004

Cited by 3 publications

(1 citation statement)

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“…With the rapid development of optoelectronics technology, narrow linewidth lasers have become important light source devices in high sensitivity optical sensing and long-range optical communication systems because of their narrow linewidth, low noise, high stability and good single-mode characteristics [1][2][3]. In practical applications, linewidth, phase noise and frequency noise are highly required [4][5].…”

Section: Introductionmentioning

confidence: 99%

Application of wavelet denoising in 3×3 phase demodulation linewidth measurement system

Zhou¹,

Yan²,

Qin³

et al. 2023

International Conference on Optoelectronic Information and Functional Materials (OIFM 2023)

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Narrow linewidth lasers have important applications in optical communication and sensing. To accurately measure the linewidth, we built a laser linewidth measurement system based on 3×3 coupler. It uses the demodulation algorithm of Differential Cross Multiplication to get the phase noise, and then obtains the linewidth value according to the β-separation line method. At the same time, we introduced wavelet denoising in the signal processing in order to reduce the influence of low frequency noise. Two wavelet bases, db4 and sym11, which were more effective for this system were identified through simulation, and experiments were conducted using a 2 μm band laser. The results prove that the frequency noise power spectral density and linewidth values are reduced after using wavelet denoising.

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Section: Introductionmentioning

confidence: 99%

Application of wavelet denoising in 3×3 phase demodulation linewidth measurement system

Zhou¹,

Yan²,

Qin³

et al. 2023

International Conference on Optoelectronic Information and Functional Materials (OIFM 2023)

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Frequency Noise Characterization of Laser Sources Based on Wavelength Division Multiplexing and Cross-Correlation Estimation

Liu,

Yang,

Liu

et al. 2024

2024 International Topical Meeting on Microwave Photonics (MWP)

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125 Gb/s multi-channel broadcasting transmission for free-space optical communication based on the optical frequency comb module

et al. 2018

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A wide-spectrum, ultra-stable optical frequency comb (OFC) module with 100 GHz frequency intervals based on a quantum dot mode locked (QDML) laser is fabricated by our lab, and a scheme with 12.5 Gb/s multi-channel broadcasting transmission for free-space optical (FSO) communication is proposed based on the OFC module. The output power of the OFC is very stable, with the specially designed circuit and the flatness of the frequency comb over the span of 6 nm, which can be limited to 1.5 dB. Four channel wavelengths are chosen to demonstrate one-to-many channels for FSO communication, like optical wireless broadcast. The outdoor experiment is established to test the bit error rate (BER) and eye diagrams with 12.5 Gb/s on-off keying (OOK). The indoor experiment is used to test the highest traffic rate, which is up to 21 Gb/s for one-hop FSO communication. To the best of our knowledge, this scheme is the first to propose the realization of one-to-many broadcasting transmission for FSO communication based on the OFC module. The advantages of integration, miniaturization, channelization, low power consumption, and unlimited bandwidth of one-to-many broadcasting communication scheme, shows promising results on constructing the future space-air-ground-ocean (SAGO) FSO communication networks.

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Widely Tunable Distributed Feedback Semiconductor Lasers with Constant Power and Narrow Linewidth

Cited by 3 publications

References 0 publications

Application of wavelet denoising in 3×3 phase demodulation linewidth measurement system

Application of wavelet denoising in 3×3 phase demodulation linewidth measurement system

Frequency Noise Characterization of Laser Sources Based on Wavelength Division Multiplexing and Cross-Correlation Estimation

125 Gb/s multi-channel broadcasting transmission for free-space optical communication based on the optical frequency comb module

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