Loss-compensated slow-light fiber Bragg grating with 22-km/s group velocity

Vigneron, P.; Boilard, Tommy; Balliu, Enkeleda; Bernier, Martin; Digonnet, Michel J. F.

doi:10.1364/ol.392808

Cited by 12 publications

(12 citation statements)

References 17 publications

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“…Sub-MHz resonances are highly sought-after for a wide range of applications such as slowlight [1,2] and information storage [3][4][5], high precision sensing [6], microwave photonics [7][8][9], spectroscopy [10], frequency stabilization [11], light detection and ranging (LIDAR) [12,13], and optical gyroscopes [14][15][16]. Demands in these applications have stimulated phenomenal progress in obtaining narrow resonances through platforms like gas-phase atomic systems [17,18], photonic crystal cavities [11,[19][20][21], whispering gallery mode (WGM) [22,23], and microring resonators [24][25][26], slow-light fiber Bragg gratings (FBGs) [2], and phase-shifted FBGs [27].…”

Section: Introductionmentioning

confidence: 99%

“…Impedance matched resonator based on -phase-shifted FBGs have exhibited narrow resonances [27], but their resonance linewidth is limited to a few MHz due to their intrinsic losses. Recently, efforts have been made to further narrow down the linewidth by using a gain medium to offset the intrinsic loss in a slow-light FBG [2]. But to achieve the narrowest resonance, the FBGs need to be probed with very low signal powers (<-50 dBm), limiting its practical use due to low signal-to-noise ratios.…”

Section: Introductionmentioning

confidence: 99%

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Resonator-free tunable sub-MHz spectral dip in the Brillouin gain using spun birefringent fibers

Choksi¹,

Liu²,

Ghasemi³

et al. 2021

Preprint

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Ultra-narrow spectral features are desirable for a broad range of applications, and they are conventionally realized using ultrahigh Q resonant structures. These structures typically require precision fabrication processes, and moreover, since they are passive, they suffer from signal loss. Here, we demonstrate a novel way to achieve sub-MHz tunable spectral dip in the Brillouin gain spectrum of a spun birefringent fiber (SBF) without loss, and without using a resonator. We show that this dip is unique to SBF, where its polarization eigenmodes are elliptical and frequency-dependent, and the dip only occurs when these orthogonal polarization eigenmodes of the SBF (at the respective pump and signal frequencies) are launched in counter-propagating directions. We experimentally demonstrate a 0.72 MHz spectral dip in the Brillouin gain spectrum of a commercial SBF which is to our knowledge, the narrowest SBS spectral feature ever reported. Furthermore, the linewidth, depth, and spectral location of this dip are tunable on demand by controlling the pump frequency, pump power, and the input polarization of the signal. Its simplicity in implementation, its ultra-narrow linewidth, and its tunability can have a wide range of potential applications, from slow-light to microwave photonics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resonator-free tunable sub-MHz spectral dip in the Brillouin gain using spun birefringent fibers

Choksi¹,

Liu²,

Ghasemi³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Also, a 6-fold increase in the sensitivity of the Brillouin ring laser gyroscope was reported when an ultrahigh Q silica wedge resonator (Q > 100 million) was being used [16]. Such favourable performance scaling has stimulated phenomenal progress in obtaining narrow resonances through platforms like gas-phase atomic systems [18,19], photonic crystal cavities [11,[20][21][22], whispering gallery mode (WGM) [23,24], and microring resonators [25][26][27], slow-light fiber Bragg gratings (FBGs) [2], and phase-shifted FBGs [28]. However, despite significant progress, there remain many challenges with these platforms.…”

mentioning

confidence: 99%

“…Impedance-matched resonator based on -phase-shifted FBGs have exhibited narrow resonances [28], but their resonance linewidth is limited to a few MHz due to their intrinsic losses. Recently, efforts have been made to further narrow down the linewidth by using a gain medium to offset the intrinsic loss in a slow-light FBG [2]. But to achieve the narrowest resonance, the FBGs need to be probed with very low signal powers (<-50 dBm), limiting its practical use due to low signal-to-noise ratios.…”

mentioning

confidence: 99%

Resonator-free sub-MHz spectral dip in a twisted gain medium

Choksi¹,

Liu²,

Ghasemi³

et al. 2021

Preprint

View full text Add to dashboard Cite

Ultra-narrow spectral features are desirable for a broad range of applications, from precision spectroscopy to atomic clocks to slow-light and microwave photonics, and are conventionally realized using either ultrahigh-Q resonant structures or atomic resonances. Ultrahigh-Q structure often involves microfabrication, and suffers from loss mechanisms and manufacturing variations that cannot be easily compensated, whereas atomic resonances suffer from signal attenuation and tunability is a challenge. Here, we propose an entirely new way to achieve a sub-MHz and tunable spectral feature in a resonator-free gain medium, exploiting polarization pulling in a medium with frequency dependent polarization eigenmodes. To demonstrate a specific realization, we use Brillouin gain in a commercial spun fiber and experimentally achieve a 0.72 MHz spectral dip, which is to our knowledge, the narrowest spectral Brillouin feature ever reported. Furthermore, the simulation shows that the dip linewidth can be reduced to <0.1MHz, equivalent to a Q of almost 2 billion, by optimizing the birefringence and spun rate of the fiber. We also show that the linewidth, depth, and spectral location of this dip are all tunable on demand by controlling the pump frequency, pump power, and the input polarization of the signal. Its simplicity in implementation and broad applicability, its ultra-narrow linewidth, its tunability makes this approach extremely attractive for applications such as high precision metrology and microwave photonics.

show abstract

mentioning

confidence: 99%

Sub-MHz spectral dip in a resonator-free twisted gain medium

Choksi,

Liu,

Ghasemi

et al. 2021

Preprint

View full text Add to dashboard Cite

Ultra-narrow spectral features are desirable for a broad range of applications, from precision spectroscopy to atomic clocks to slow-light and microwave photonics, and are conventionally realized using either ultrahigh-Q resonant structures or atomic resonances.Ultrahigh-Q structure often involves microfabrication, and suffers from loss mechanisms and manufacturing variations that cannot be easily compensated, whereas atomic resonances suffer from signal attenuation and tunability is a challenge. Here, we propose an entirely new way to achieve a sub-MHz and tunable spectral feature in a resonator-free gain medium, exploiting polarization pulling in a medium with frequency-dependent polarization eigenmodes. To demonstrate a specific realization, we use Brillouin gain in a commercial spun fiber and experimentally achieve a 0.72 MHz spectral dip, which is to our knowledge, the narrowest spectral Brillouin feature ever reported. Furthermore, the simulation shows that the dip linewidth can be reduced to <0.1MHz, equivalent to a Q of almost 2 billion, by optimizing the birefringence and spun rate of the fiber. We also show that the linewidth, depth, and spectral location of this dip are all tunable on demand by controlling the pump frequency, pump power, and the input polarization of the signal. Its simplicity in implementation and broad applicability, its ultra-narrow linewidth, its tunability makes this approach extremely attractive for applications such as high precision metrology and microwave photonics. MainUltra-narrow resonances are highly sought-after for a wide range of applications such as slow-

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Loss-compensated slow-light fiber Bragg grating with 22-km/s group velocity

Cited by 12 publications

References 17 publications

Resonator-free tunable sub-MHz spectral dip in the Brillouin gain using spun birefringent fibers

Resonator-free tunable sub-MHz spectral dip in the Brillouin gain using spun birefringent fibers

Resonator-free sub-MHz spectral dip in a twisted gain medium

Sub-MHz spectral dip in a resonator-free twisted gain medium

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