Small-diameter polarization maintaining optical fiber

Abstract

Disclosed is a small-diameter polarization maintaining optical fiber, which relates to the field of special optical fibers. The small-diameter polarization maintaining optical fiber comprises a quartz optical fiber (); the periphery thereof is provided with an inner coating () and an outer coating (); the interior of the quartz optical fiber () is provided with an optical fiber core layer () and a quartz cladding (); two stress zones () are arranged between the optical fiber core layer () and the quartz cladding (); a buffer coating () is arranged between the inner coating () and the outer coating (); the periphery of each stress zone () is provided with a buffer layer () which is concentric with the stress zone (); when a working wavelength of a small-diameter polarization maintaining optical fiber is 1310 nm, the attenuation thereof reaches less than 0.5 dB/km, and the crosstalk reaches −35 dB/km; and when the working wavelength of the small-diameter polarization maintaining optical fiber is 1550 nm, the attenuation thereof reaches less than 0.4 dB/km, and the crosstalk reaches −30 dB/km. The optical fiber not only has excellent stability characteristics of attenuation and crosstalk, but also has the excellent stability characteristic of long-term operation, and can provide a better optical fiber ring for research on a high-precision optical fiber gyroscope, thereby laying the foundation for the development directions of miniaturization and high precision of the optical fiber gyroscope.