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

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

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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 Acne Treatment 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 O-Ring Kit filtering functions.The device is expected to play an important role in the development of tunable, multi-wavelength, and compact fiber lasers.