In this paper, a dual-parameter sensor based on surface plasmon resonance (SPR)-photonic crystal fiber (PCF) is proposed, which can be applied in detecting magnetic field and temperature. Two channels on...
In this paper, we investigate the characteristics of all-optical modulation via thermo-optic effects of an optical microfiber coupler (OMC) and the theoretical analysis and experimental results are shown. The intensity modulation and the phase modulation efficiency are proportional to the length of the OMC' waist region, the pump light intensity, etc. We experimentally characterize the OMC, presenting that stable intensity and phase modulation can be realized by pumps at microwatts level. For OMC' intensity modulation, the modulation bandwidth is measured to be 50 kHz under 1.7 mW pump light intensity. We also demonstrate OMC's phase modulation function, and the frequency response characteristics of the OMC phase modulator shows similar properties with the OMC's intensity modulation, which mainly depends on the waveguide structures of the OMC' waist region and the heat conduction property of the waveguide materials. These results are valuable for the development of all-optical modulators and all-optical tunable filters based on subwavelength scales optical fiber, and hold great potential in laser and optical sensing applications.
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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