An in-line quasi-Sagnac interferometer based comb filter used for tunable multi-wavelength fiber laser

Sun, Hao; Zhang, Jing; Yang, Zaihang; Zhou, Lixin; Qiao, Xueguang; Hu, Manli

doi:10.1016/j.optlastec.2015.03.017

Cited by 26 publications

(13 citation statements)

References 13 publications

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“…Another successful effort of mixing FRL and Sagnac interferometer together was made in 2015 by Sun et al [ 63 ]. They demonstrated an in-line quasi-Saganc interferometer comb filter for tunable multi-wavelength fiber laser in 2015.…”

Section: Sensing Applicationsmentioning

confidence: 99%

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Xie

Zhang

Wang

et al. 2018

Sensors

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A review for optical fiber sensors based on fiber ring laser (FRL) demodulation technology is presented. The review focuses on the principles, main structures, and the sensing performances of different kinds of optical fiber sensors based on FRLs. First of all, the theory background of the sensors has been discussed. Secondly, four different types of sensors are described and compared, which includes Mach–Zehnder interferometer (MZI) typed sensors, Fabry–Perot interferometer (FPI) typed sensors, Sagnac typed sensors, and fiber Bragg grating (FBG) typed sensors. Typical studies and main properties of each type of sensors are presented. Thirdly, a comparison of different types of sensors are made. Finally, the existing problems and future research directions are pointed out and analyzed.

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Section: Sensing Applicationsmentioning

confidence: 99%

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Xie

Zhang

Wang

et al. 2018

Sensors

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“…To date, much efforts have been made on fiber comb filters that can process optical signals or block unwanted signals causing crosstalks in wavelength-routed optical networks owing to their simple structure, ease of fabrication, and good fiber compatibility. They can be applied to multiwavelength lasing or switching [1], [2], microwave signal processing [3], [4], optical label switching [5], [6], optical pulse train generation [7], etc. Absolute wavelength tuning of passbands of a comb filter is highly required for extracting or rejecting the desired wavelength component in wavelength-division multiplexed optical systems.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Independent Wavelength-Tunable First-Order Fiber Comb Filter

Jung

Lee

2019

IEEE Photonics J.

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Here, we propose a polarization-independent wavelength-tunable first-order fiber comb filter based on a polarization-diversified loop configuration. The proposed filter is composed of a polarization beam splitter, two equal-length high birefringence fiber (HBF) segments, three half-wave retarders (HWRs), and two quarter-wave retarders (QWRs). Among these five wave retarders (WRs), a group of an HWR and a QWR is located in front of each HBF. The third remaining HWR is positioned after the second HBF segment and utilized to adjust the effective orientation angle of this HBF. On the basis of the filter transmittance derived through Jones formulation, orientation angle sets of the five WRs, which can induce an arbitrary phase shift from 0 to 2π in the transmittance function, are found at both flat-top and narrow band transmission spectra. From theoretical transmission spectra obtained at eight selected orientation angle sets of the five WRs, which cause phase shifts increasing linearly from 0 to 7π/4 by a step of π/4, it is confirmed that the flat-top or narrow band comb spectrum can be continuously tuned by properly controlling the WR orientation angles. Then, this theoretical prediction is verified by experimental demonstration. In particular, the spectral evolution of the output states of polarization (SOPs) of the third HWR, the last one of optical components contained within the polarization-diversified loop, is investigated on the Poincare sphere. The relationship of the passband shape and wavelength tuning with the spectral evolution of the SOP is also discussed.

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“…Due to simple design, ease of use, and good fiber compatibility, fiber comb filters have been considered as useful wavelength-selective elements that can be employed to route and process optical signals or block unwanted signals causing crosstalks in dense wavelength-division-multiplexed (DWDM) optical networks. They can also be applied to multiwavelength fiber lasers or waveband sources 1 – 4 , microwave photonic filters 5 , 6 , optical pulse train generation 7 , and so forth. Continuous wavelength tunability of a comb filter is highly beneficial to its efficiency when the filter is involved to select the desired wavelength component or prevent interference between wavelength components in wavelength-routing devices or multiwavelength sources.…”

Section: Introductionmentioning

confidence: 99%

“…Continuous wavelength tunability of a comb filter is highly beneficial to its efficiency when the filter is involved to select the desired wavelength component or prevent interference between wavelength components in wavelength-routing devices or multiwavelength sources. Numerous efforts have been made to provide a comb filter with wavelength tunability by incorporating a Sagnac birefringence loop (SBL) 8 , 9 , a double-loop Mach-Zehnder interferometer (MZI) 10 – 12 , a Lyot-type birefringence filter 1 , 13 , 14 , fiber gratings 15 , 16 , and a polarization-diversified loop structure (PDLS) 17 – 20 . Among various approaches, comb filters based on the PDLS 21 , 22 , which is constructed using a polarization beam splitter (PBS), have great advantages in terms of effective and flexible switching or tuning capability of their passbands 17 – 20 , 23 .…”

Section: Introductionmentioning

confidence: 99%

“…That is partly because an SBL-based comb filter, which uses a directional coupler, suffers from degradation in extinction ratio (ER) during its passband tuning 8 , 9 , 24 . In particular, PDLS-based comb filters are more resistant to external perturbations such as heat and vibration in comparison with MZI-based ones 10 – 12 and also polarization independent unlike Lyot-type birefringence filters 1 , 13 , 14 . The resonances of fiber gratings can be frequency-shifted using physical stimuli such as tension, pressure, and heat.…”

Section: Introductionmentioning

confidence: 99%

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Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure

Jung

Lee

2017

Sci Rep

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Continuous wavelength tuning of optical comb filters, which is an essential functionality for flexible signal processing in reconfigurable optical systems, has been challenging in high order filter structures with two birefringent elements (BEs) or more due to cumbersomeness in finding a combination of waveplates and BEs and complexity in determining their individual azimuthal orientations. Here, we propose a continuously tunable polarization-independent passband-flattened fiber comb filter with two BEs using a polarization-diversified loop structure for the first time. The proposed filter consists of a polarization beam splitter and two groups of a half-wave plate, quarter-wave plate, and polarization-maintaining fiber (PMF). The azimuthal orientation of PMF in the second group is fixed as 22.5°. Orientation angle sets of the four waveplates, which can induce an arbitrary phase shift from 0 to 2π in the passband-flattened transmittance function, are found from the filter transmittance derived using Jones matrix formulation. From theoretical spectral analysis, it is confirmed that passband-flattened comb spectra can be continuously tuned. Theoretical prediction is verified by experimental demonstration. Moreover, the wavelength-dependent evolution of the output state of polarization (SOP) of each PMF is investigated on the Poincare sphere, and the relationship between wavelength tuning and SOP evolution is also discussed.

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An in-line quasi-Sagnac interferometer based comb filter used for tunable multi-wavelength fiber laser

Cited by 26 publications

References 13 publications

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Optical Fiber Sensors Based on Fiber Ring Laser Demodulation Technology

Polarization-Independent Wavelength-Tunable First-Order Fiber Comb Filter

Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure

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