Vernier effect of Fiber Interferometer based on cascaded PANDA polarization maintaining fiber
This letter shows Vernier effect based on two segments of PANDA polarization maintaining fiber (PMF) whose length is 28 cm and 23 cm, respectively. The two PMF is spliced together and the angle between the fast axes is set to 45°. This cascaded PMF is inserted in a Sagnac loop to form an interferometer which can generate Vernier effect. The spectrum consists of finesse fringe and envelope and realize simultaneous measurement of strain and temperature. The envelope can provide strain and temperature sensitivities of 58.0 pm/με and -1.05 nm/°C. The finesse fringe provides sensitivities of 5.9 pm/με and -1.36 nm/°C.
Liu Shun,Lu Ping,Chen Enci,Ni Wenjun,Liu Deming,Zhang Jiangshan,Lian Zhenggang. Vernier effect of Fiber Interferometer based on cascaded PANDA polarization maintaining fiber[J].Chinese Optics Letters,2019,17(8):08.