Mach–Zehnder Interferometer Based on S-Tapered All-Solid Photonic Bandgap Fiber

Abstract

We propose an S-tapered fiber Mach-Zehnder interferometer based on all-solid photonic bandgap fibers. Theoretical and experimental results reveal that the interference pattern originates from the coupling between core modes LP 01 and LP 11 , LP 01 cladding supermode. The proposed structure exhibits quite sensitive to temperature and nearly insensitive to surrounding refractive index (RI). Moreover, the temperature-strain cross sensitivity is only 0.0092°C/με. The strain/surrounding RI responses show little impact on the temperature sensing precision. Such a structure is easy to fabricate and can be a promising temperature sensor, eliminating the RI/strain-induced cross sensitivity.Index Terms-S-tapered structure, all-solid photonic bandgap fibers, refractive index, temperature, strain.

Comparative spectral tuning and fluctuation analysis of an all-fiber Mach–Zehnder interferometer and micro Mach–Zehnder interferometer

“…Based on the output power of the the fast Fourier transform will provide the spatial frequency spectra. Figure 9 shows the amplitude spectra in the spatial frequency domain, and the peaks observed in the spatial frequency spectra are attributed to different orders of cladding modes [17,[93][94][95]111]. The interference length between the twotapered region increases, the FSR of the spectrum decreases, and the peaks in the spatial frequency shift towards the right [37,101].…”

Broad -band nonlinear optical response in Bi2Te0.6S2.4 alloys based on alloy engineering

“…[3][4][5] Considering their energy structure, 6 small bandgap materials are suitable candidates for the broadband operation of saturable absorbers because of their optical response in the infrared band. Recently, [7][8][9] V-VI metal chalcogenide materials such as Bi 2 Te 3 and Bi 2 Se 3 have shown intriguing potential for ultrabroadband nonlinear optical materials owing to their small bandgap (0.3 eV for Bi 2 Se 3 and 0.15 eV for Bi 2 Te 3 ). For example, Bi 2 Te 3 10 displayed saturable absorption response in the long-wave infrared region, and Bi 2 Se 3 11 has been used as a saturator for the Nd : LiYF laser to obtain a Q-switched output of 1.3 m. Similarly, the application potential of Bi 2 S 3 as a V-VI bismuth group material for saturable absorbers in the near infrared region is limited because of its bandgap of 1.2-1.5 eV.…”