Research on Tunable Filter Based on Micro-Ring Resonators

Danning, 吴丹宁 Wu; Yuanda, 吴远大 Wu; Yue, 王玥 Wang; Junming, 安俊明 An; Xiongwei, 胡雄伟 Hu

doi:10.3788/aos201636.0123002

Cited by 1 publication

(1 citation statement)

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“…All of the above technologies could be regarded as inserting some types of fiber filters or modulators into the resonator to realize tunability or multiwavelength output [15]- [18]. In addition, the tunable fiber filters and intensity modulators have been commonly used in wavelength/intensity modulation, Q-switch, mode selection in fiber lasers, and also in application fields such as sensing, microwave photonics and communication systems [19]- [22]. However, most of the existing tunable filters and modulators are realized generally based on electro-optic effects, thermo-optic effects, or elastic-optic effects and driven with electrical signal.…”

Section: Introductionmentioning

confidence: 99%

All-Optical Modulation Characteristics of a Microfiber Coupler Combined Sagnac Loop

Bian

Wang

et al. 2019

IEEE Photonics J.

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In this paper, we theoretically and experimentally investigate the all-optical modulation characteristics of a microfiber coupler combined Sagnac loop (MCSL). We inject pump lights with different intensities into the MCSL and utilize the thermo-optical effect from the microfiber coupler to control the phase relationship between the counter-propagating beams inside the Sagnac loop. The spectral characteristics from the Sagnac loop can be controlled accordingly, and the rate of the frequency comb (interference characteristic wavelength) shift can be 1 pm/mW. In addition, at a specific wavelength (e.g., 1550 nm), the MCSL can be used as an intensity modulator as well as a reflectivity-tunable Sagnac reflector. The reflectivity variation of the Sagnac reflector can reach about 10% when the pump light is at milliwatt level. The intensity modulation depth can be 9.3% at 100 Hz when the intensity-modulated 980 nm pump light imposed on the MCSL is 5.5 mW. Based on the thermo-optical effect, the MCSL can achieve the all-optical intensity modulation and all optically tunable filtering functions. The device is expected to play an important role in the development of tunable, multi-wavelength, and compact fiber lasers.

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Section: Introductionmentioning

confidence: 99%