Subhertz linewidth laser by locking to a fiber delay line

Dong, Jing; Hu, Yue; Huang, Junchao; Ye, Meifeng; Qu, Qiuzhi; Li, Tang; Liu, Liang

doi:10.1364/ao.54.001152

Cited by 39 publications

(37 citation statements)

References 16 publications

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“…Again note that the estimation of our fiber noise is very conservative, and the fiber noise is very likely much smaller. In fact, the fiber noise reported by Dong et al ., is close to the thermal noise limit 22 . Another way to reduce fiber noise is to actively stabilize the fiber to an ultra-low phase noise cw laser.…”

Section: Discussionsupporting

confidence: 66%

“…By using intrinsically low phase noise RF oscillators, −100 dBc/Hz at close to carrier frequency is feasible by carefully designing an environmental isolation system such as ref. 22. Note that using intrinsically low phase noise RF oscillators is not very effective in conjunction with other methods for active phase noise suppression, for example based on the use of high harmonics of an EO comb, since the sensitivity is not as good as the present method even when using sidemodes of an EO comb up to a harmonic order of 100 10, 27 .…”

Section: Discussionmentioning

confidence: 84%

“…This additional feedback loop can be easily added to the setup. At the PD (up-stream from the mixer), we can access a signal containing both fiber noise and phase noise of the cw laser, which can be used as an error signal to stabilize the fiber to the cw laser 22–24 .…”

Section: Discussionmentioning

confidence: 99%

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Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Kuse¹,

Fermann²

2017

Sci Rep

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Recent progress in ultra low phase noise microwave generation indispensably depends on ultra low phase noise characterization systems. However, achieving high sensitivity currently relies on time consuming averaging via cross correlation, which sometimes even underestimates phase noise because of residual correlations. Moreover, extending high sensitivity phase noise measurements to microwaves beyond 10 GHz is very difficult because of the lack of suitable high frequency microwave components. In this work, we introduce a delayed self-heterodyne method in conjunction with sensitivity enhancement via the use of higher order comb modes from an electro-optic comb for ultra-high sensitivity phase noise measurements. The method obviates the need for any high frequency RF components and has a frequency measurement range limited only by the bandwidth (100 GHz) of current electro-optic modulators. The estimated noise floor is as low as −133 dBc/Hz, −155 dBc/Hz, −170 dBc/Hz and −171 dBc/Hz without cross correlation at 1 kHz, 10 kHz, 100 kHz and 1 MHz Fourier offset frequency for a 10 GHz carrier, respectively. Moreover, since no cross correlation is necessary, RF oscillator phase noise can be directly suppressed via feedback up to 100 kHz frequency offset.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 84%

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Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Kuse¹,

Fermann²

2017

Sci Rep

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“…However, the sources of the noise floor are still in doubt 18,24,25 . Recently, in the experiment for ultra-stable fiber-stabilized laser, Dong et al 8 observed that the frequency noise PSD range from 1 Hz to 100Hz exhibits a 1 f characteristic seems consistent with Duan's theory. In spite of the recent experimental progress, the thermal noise below 30 Hz is still unclear owing to the excess noise sources such as laser noise, electronic noise and environmental noise.…”

mentioning

confidence: 52%

“…In many fiber-based systems, such as interferometric fiber-optic sensors [1][2][3][4] , fiber lasers [5][6][7] , and fiber-delay-line stabilized lasers 8 , the fundamental resolution or frequency stability is limited by the intrinsic thermal noise inside optical fibers. Thus, an experimental and theoretical understanding of the thermal noise in optical fibers is important.…”

mentioning

confidence: 99%

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Dong

Huang

et al. 2016

Applied Physics Letters

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The intrinsic thermal noise in optical fibers represents the ultimate limit for fiber-based systems. However, at infrasonic frequencies, the spectral behavior of the intrinsic thermal noise is still unclear. In this letter, we present measurements of the fundamental thermal noise in optical fibers that are obtained using a balanced fiber Michelson interferometer. When an ultra-stable laser is used as the laser source and other noise sources are carefully controlled, the 1/f spectral density of the thermal noise is observed down to infrasonic frequencies, and the measured magnitude is consistent with the results of theoretical predictions at frequencies over the range from 0.2 Hz to 20 kHz. Moreover, as observed experimentally, the level of the 1/f thermal noise can be reduced by changing the coatings of the optical fibers. This therefore indicates one possible way to reduce thermal noise in optical fibers at low Fourier frequencies. Finally, the inconsistency between the experimental data and the existing theory for thermomechanical noise is discussed.

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Ultralow‐Noise Single‐Frequency Fiber Laser and Application in High‐Resolution Fiber‐Optic Dynamic Strain Sensing

Zhao

Sun

Zeng

et al. 2022

Advanced Photonics Research

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Recently, single-frequency fiber lasers (SFFLs), which have many advantages of all-fiber compact structure, good beam quality, narrow linewidth, and convenient thermal management, are of great interest for various applications, including optical communication, coherent beam combining, nonlinear frequency conversion, and optical fiber sensing. [1][2][3][4] Among them, as a critical branch of optical fiber sensing, fiber-optic strain sensing is widely used for dynamic deformation measurement, structural health monitoring, and underwater acoustic detection. [5][6][7][8] Particularly, for frontier research areas involving nanotechnology, biophotonics, seismology, and geophysics, [9][10][11][12] a high resolution (typically pε or sub-pε) is demanded of the strain sensor. With the development of photonics technologies and the gradual reduction of other noises, the noise characteristics of the single-frequency laser source have become the key factors limiting the increase of strain sensing resolution, especially for weak strain signals in the low-frequency range. [13][14][15][16] Consequently, the realization of an ultralow-noise singlefrequency laser source, to satisfy the increasing demand for high-resolution fiber-optic dynamic strain sensing, has become a matter of intense interest.The suppression of phase noise, especially in the lowfrequency range, is still technically challenging. As known, Pound-Drever-Hall (PDH) technology provides a reliable solution, and the error signal representing phase fluctuation is usually extracted through the ultrahigh-finesse Fabry-Pérot

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Subhertz linewidth laser by locking to a fiber delay line

Cited by 39 publications

References 16 publications

Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Ultralow‐Noise Single‐Frequency Fiber Laser and Application in High‐Resolution Fiber‐Optic Dynamic Strain Sensing

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