All-fiber compound ring resonator with a ring filter

Zhang, Jianluo; Lit, John W. Y.

doi:10.1109/50.301819

Cited by 40 publications

(5 citation statements)

References 15 publications

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“…The SF operation of the TDFL can be guaranteed with the cooperated mode selecting effects of the FBG, the FP filter and the unpumped PM-FBG based SA filter. The subring cavity employed could bring the Vernier effect [26,27], significantly enlarging the effective longitudinal-mode spacing and enhancing the stability of SF operation, compared with the use of main-cavity only [28].…”

Section: Experimental Setup and Results Of The Sf Tdflmentioning

confidence: 99%

Demonstration of linewidth measurement based on phase noise analysis for a single frequency fiber laser in the 2 μm band

Yan¹,

Yan²,

Tian³

et al. 2019

Laser Phys.

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Linewidth measurement based on phase noise analysis using a 3 × 3 coupler has been applied in the 1550 nm band. One of the obvious advantages of this method compared with the common delayed self-heterodyne method is the low loss caused by the short delay line used. Taking full advantage of this particular characteristic, the linewidth of the single frequency (SF) fiber laser in the 2 μm band can also be measured. However, a specifically experimental demonstration of this method in the 2 μm band is absent to date. In this paper, a high-performance SF thulium-doped fiber laser (TDFL) was proposed and employed for the demonstration. The TDFL operates at the center wavelength of 1942.03 nm with high stability. By means of the phase noise analysis-based linewidth measurement system with a fiber delay line of only 50 m, the linewidth of the proposed TDFL is successfully measured. When the measuring time is 0.001 s, the linewidth is ~47 kHz. Furthermore, the noise characteristics of the SF laser were simultaneously studied by this method.

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Section: Experimental Setup and Results Of The Sf Tdflmentioning

confidence: 99%

Demonstration of linewidth measurement based on phase noise analysis for a single frequency fiber laser in the 2 μm band

Yan¹,

Yan²,

Tian³

et al. 2019

Laser Phys.

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show abstract

“…First, the effective free-spectral range (FSR) of DRCC should be comparable with the reflection bandwidth of SFBG, which allows only one effective transmission channel of DRCC to be dropped in each reflection bandwidth of SFBG. As the difference in cavity length between ring 1 and ring 2 of the DRCC was 0.2 cm, according to the Vernier effect [32], when the difference in cavity length between the two DRCC rings is much less than their cavity lengths, the effective FSR of DRCC is given as / ( )…”

Section: B Principle Of Slm Lasingmentioning

confidence: 99%

Six-Wavelength-Switchable SLM Thulium-Doped Fiber Laser Enabled by Sampled FBGs and 3 × 3 Coupler Based Dual-Ring Compound Cavity Filter

et al. 2022

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A switchable and tunable six-wavelength single-longitudinal mode (SLM) thulium-doped fiber laser in the 2050 nm band is proposed and experimentally demonstrated. Two cascaded sampled fiber Bragg gratings (SFBGs), acted as an integrated six-channel reflector, are to define the lasing wavelength channels in a multi-wavelength switchable fiber laser for the first time. The switchability of the fiber laser was realized by polarization-dependent loss modulation. SLM lasing in each channel was guaranteed by a novel passive dual-ring compound cavity (DRCC), composed of two symmetric 3 × 3 optical couplers (OCs). Six single-wavelength operations are easily obtained and switched, with the high optical signal-to-noise ratios of >71 dB, >72 dB, >62 dB for λ 11 -λ 13 and > 65 dB, >61 dB, >59 dB for λ 21 -λ 23, respectively. The maximum power and wavelength fluctuations are as low as 0.56 dB and 0.01 nm, respectively. The measured laser linewidths ranged from 7.5 to 9.2 kHz, calculated by the β-separation line method based on the measured frequency noise spectra. Nine switchable dual-wavelength operations with different wavelength intervals and two triple-wavelength operations were also obtained. Our proposed fiber laser has great potential in free-space optical communication.

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“…The subring cavity is made of a 50:50 optical coupler (C-2) and is with a length of 34 cm. The function of the subring cavity is to stabilize the SLM operation of the EDFL by enlarging the effective longitudinal-mode spacing of the laser oscillation based on the vernier effect [37,38].…”

Section: Configuration Of Proposed Edflmentioning

confidence: 99%

“…In order to increase the SLM lasing stability further, we inserted a small subring with a length of only 34 cm. According to the vernier effect [37,38], because the length of main cavity L main (~21 m) is much larger than the length of subring cavity L subring , L main L subring , the effective free spectrum range (FSR) FSR eff can be estimated by…”

Section: Principle Of Stable Slm Operationmentioning

confidence: 99%

C-band 41-wavelength-switchable single-longitudinal-mode fiber laser with sub-kHz linewidth and high stability using a wide-band chirped Moiré fiber Bragg grating

et al. 2019

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A high-performance wavelength-switchable single-longitudinal-mode (SLM) fiber laser with ultra-narrow linewidth and high stability in C-band was proposed and demonstrated, mainly benefiting from the use of a wide-band chirped Moiré fiber Bragg grating (WB-CM-FBG) with 41 ultra-narrow channels. By combining the WB-CM-FBG with a manual tunable bandpass filter and using a subring cavity with a length of only 34 cm to efficiently stabilize the SLM lasing, we achieved switchable lasing operation among 41 wavelengths, with a switching-step of ~0.96 nm from 1526.592 nm to 1565.126 nm, covering the whole C-band, and obtained sub-kHz linewidth at every lasing wavelength. The high stability was validated by the measured slight fluctuations of lasing wavelength and optical power of <0.004 nm and <0.113 dB, respectively, in 1.5 h. To the best of authors’ knowledge, this is the state-of-the-art CM-FBG-based fiber laser reported with the greatest number of switchable-wavelengths covering C-band, and, what’s more, each switchable lasing wavelength was with sub-kHz linewidth. The performance of the proposed fiber laser can be improved further with good temperature compensation and vibration isolation packaging for practical applications.

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All-fiber compound ring resonator with a ring filter

Cited by 40 publications

References 15 publications

Demonstration of linewidth measurement based on phase noise analysis for a single frequency fiber laser in the 2 μm band

Demonstration of linewidth measurement based on phase noise analysis for a single frequency fiber laser in the 2 μm band

Six-Wavelength-Switchable SLM Thulium-Doped Fiber Laser Enabled by Sampled FBGs and 3 × 3 Coupler Based Dual-Ring Compound Cavity Filter

C-band 41-wavelength-switchable single-longitudinal-mode fiber laser with sub-kHz linewidth and high stability using a wide-band chirped Moiré fiber Bragg grating

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