Study of injection-locked stabilized, short cavity Brillouin ring laser source design for fiber sensing applications

Bolognini, G.; Bastianini, Filippo; Rossi, Leonardo

doi:10.1051/jeos/2022005

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…Although it does so with sub-milliwatt output power, the primary DFB laser emits power of ~5 mW with a linewidth close to 400 Hz. This characteristic makes the laser especially suitable for dualwavelength applications, such as distributed fiber Brillouin sensing [50][51][52]. However, for applications that rely on a single-wavelength laser and need a sub-100-Hz laser linewidth, this configuration may not be the most practical choice.…”

Section: Introductionmentioning

confidence: 99%

Sub-100-Hz DFB Laser Injection-Locked to PM Fiber Ring Cavity

Panyaev,

Itrin,

Korobko

et al. 2024

J. Lightwave Technol.

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Low-noise lasers are invaluable tools in applications ranging from precision spectroscopy and displacement measurements to the development of advanced optical atomic clocks. Although all these applications benefit from reduced frequency noise, some also demand a low-cost and robust design. In this work, we introduce a novel and practical concept of a simple, single-frequency laser that utilizes a ring fiber cavity for self-injection locking of a standard semiconductor distributed feedback (DFB) laser. Contrary to previously reported solutions, our laser configuration is fully spliced from polarizationmaintaining (PM) single-mode optical fiber components. This results in an adjustment-and maintenance-free narrow-band laser operation with significantly enhanced stability against environmental noise. Importantly, continuous-wave (CW) singlefrequency laser operation is achieved through self-injection locking, while the low-bandwidth active optoelectronic feedback serves exclusively to maintain this regime. Operating with output powers of ~8 mW, the proposed fiber configuration narrows the natural Lorentzian linewidth of the emitted light to ~ 75 Hz and ensures phase and intensity noise levels of less than -120 dBc/Hz (> 10 kHz) and -140 dBc/Hz (> 30 kHz), respectively. Furthermore, the thermally stabilized laser exhibits a frequency drift of less than ~ 0.5 MHz/min with a maximal frequency walkoff of < 8 MHz. We believe that translating this laser design to integrated photonics in the near future could dramatically lower costs and reduce the footprint in various applications, including ultra-high-capacity fiber and data center networks, atomic clocks, and microwave photonics.

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Section: Introductionmentioning

confidence: 99%

Sub-100-Hz DFB Laser Injection-Locked to PM Fiber Ring Cavity

Panyaev,

Itrin,

Korobko

et al. 2024

J. Lightwave Technol.

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Low-noise φ-OTDR employing nonlinear optical preamplification for distributed acoustic sensing

Rossi¹,

Cheng

Jong

et al. 2023

Appl. Opt.

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A phase sensitive optical time domain reflectometry sensing scheme employing a two-stage nonlinear optical preamplification system is proposed to reduce the blind spot effect in Rayleigh scattering by improving the optical power distribution and to enhance the resolution at locations of low-backscatter intensity measurements, providing a higher signal-to-noise ratio for distributed acoustic measurements; the developed system has been tested in-laboratory and on in-field monitoring of a survey well in Cottessen, The Netherlands. The characterization shows strain noise levels below 1 nɛ for a 10 kHz sampling rate.

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