Narrow Linewidth External Cavity Laser Capable of High Repetition Frequency Tuning for FMCW LiDAR

Wu, Ying; Deng, Lihua; Yang, Kyu Hwan; Liang, Wei

doi:10.1109/lpt.2022.3203063

Cited by 18 publications

(6 citation statements)

References 19 publications

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“…The laser is a core component of the phase stability system, and its output characteristics directly affect stable phase transmission. Parameters like laser linewidth, frequency stability, and output power influence the phase noise characteristics of the system [12][13][14][15][16] . Choosing a laser with lower linewidth and frequency drift can improve the phase stability of the system.…”

Section: Introductionmentioning

confidence: 99%

Stability-enhanced RF signal transmission over long fiber-optic links

Yin,

Zheng,

Zhang

et al. 2024

中国光学快报

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We propose a method for optimizing the phase stability of microwave signal transmission over long distances. First, the design of the photon link was modified to reduce the radio frequency (RF) signal's baseline noise and increase power. Second, a low-noise driver circuit was developed for a two-section distributed feedback (DFB) laser designed using reconstruction equivalent chirp (REC) technology to create an ultra-stable laser, and its performance was characterized through linewidth data. Test results indicate that the DFB laser achieved narrower linewidth, improving system phase stability. When an injection current (30 mA) is applied to the reflection section of the two-section DFB laser, the laser linewidth will be narrower (1.38 MHz), further enhancing the system's phase transmission stability. At a 1 Hz offset frequency, a residual phase noise of −88.65 dBc/Hz is obtained. The short-term stability with an averaging time of 1 s is 1.60 × 10 −14 , and the long-term stability over a testing time of 60,000 s is 3.41 × 10 −18 . Even after incorporating temperature variations, the long-term stability reaches 8.37 × 10 −18 at 22 h.

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Section: Introductionmentioning

confidence: 99%

Stability-enhanced RF signal transmission over long fiber-optic links

Yin,

Zheng,

Zhang

et al. 2024

中国光学快报

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“…To achieve highly reliable OFDR measurements over extended interrogation lengths, the tunable laser must possess both a long coherence length and the capacity for stable sweep linearity and mode-hopping-free wavelength tuning. External cavity-tuned diode lasers are commonly employed in OFDR applications due to their wider wavelength tuning range, stability, and narrow linewidth characteristics [8]. However, these lasers are costly, contributing significantly to the overall expenditure of the OFDR system.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Mode Hopping Impacts on OFDR Sensing Performance

Wang,

Lalam,

Zhao

et al. 2024

Photonics

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This article examines the impacts of mode hopping on the sensing performance of optical frequency domain reflectometry (OFDR) and explores the potential for developing economical OFDR interrogators employing low-cost distributed feedback (DFB) lasers. By conducting numerical simulations, this study reveals that mode hopping has minimal effects on distance sensing measurements in free space due to the limited duration of beat interference signal at the incorrect frequency within the coherence length. Additionally, the simulations indicate that mode hopping only slightly affects the distributed strain sensing of OFDR, resulting in an error range of less than ±1µε when 100µε is applied to the sensing fiber. These findings highlight the potential of using low-cost DFB lasers with a 1-nm wavelength sweep range and a 1-MHz linewidth as tunable laser sources in OFDR while maintaining reliable and accurate sensing performance.

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“…High stability and narrow linewidth lasers have diverse applications in gravitational wave detection, atomic clock, LiDAR, optical sensor and coherent communications. [1][2][3][4] Narrow linewidth lasers can boost scan rates, increase detection distances, and imaging clarity. For coherent communication and sensing, there is much effort towards developing narrow linewidth semiconductor lasers, beyond what is achievable with single Fabry-Perot or distributed feedback (DFB) resonators.…”

Section: Introductionmentioning

confidence: 99%

Full parameter extraction of a temperature-insensitive quantum well DFB laser using an optical injection technique

Ding¹,

Doggett²,

Herrera³

et al. 2023

Physics and Simulation of Optoelectronic Devices XXXI

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Distributed feedback lasers are key ingredients of high-speed, high-capacity integrated photonic chips. In this work, we extract the linewidth enhancement factor above threshold by measuring the transitional points in the optical-injection stability map from a quantum well distributed feedback laser with a temperature-controlled mismatch between the lasing and optical gain peaks. This unique measurement technique allows the simultaneous extraction of important parameters influencing the linewidth, particularly the photon lifetime. When the current is higher than twice threshold and 50 ℃, the linewidth enhancement factor is smaller than that at 10 ℃. This effect is attributed to the increasing differential gain at the lasing peak position, which is a result of the larger optical mismatch. We also measured the spectral linewidth at different temperatures, which then yields the spontaneous emission factor, n sp . Due to the low linewidth enhancement factor at high temperatures, a large photon lifetime, and a modest increase in n sp , the linewidth does not drastically increase with pump current and stays below 100 kHz at 50 ℃. Overall, the stability of the linewidth enhancement factor combined with the large optical mismatch brings a relative temperature insensitivity, which is of paramount importance for applications requiring high-temperature operation and improved coherent light.

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Narrow Linewidth External Cavity Laser Capable of High Repetition Frequency Tuning for FMCW LiDAR

Cited by 18 publications

References 19 publications

Stability-enhanced RF signal transmission over long fiber-optic links

Stability-enhanced RF signal transmission over long fiber-optic links

Simulation Analysis of Mode Hopping Impacts on OFDR Sensing Performance

Full parameter extraction of a temperature-insensitive quantum well DFB laser using an optical injection technique

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