Lithium niobate doped silica fiber

Abstract

The invention relates to a lithium niobate doped silica fiber. The fiber is prepared by adding the high-temperature gasification lithium niobate process to the improved chemical gas-phase deposition process. The prepared lithium niobate doped silica fiber is of a fiber core layer lithium niobate doped matched type structure or an inner wrapping layer lithium niobate doped structure or a fiber coreand inner wrapping layer lithium niobate doped structure, and the lithium niobate doped silica fibers of the three structures all have high refractive index difference, low loss and high Raman gain coefficient. The fiber is used for a Raman fiber amplifier, can obtain high Raman gains, and can overcome the defect that a traditional single-mode optical fiber Raman amplifier is low in gain. Meanwhile, the preparing process is mature, and the batched production of the lithium niobate doped silica fiber can be realized.

Description

technical field [0001] The invention relates to a lithium niobate doped quartz optical fiber, which belongs to the field of optical fiber communication and optical fiber sensing. Background technique [0002] With the advent of the era of high-speed, large-bandwidth, and low-loss all-fiber communication, research on fiber amplifiers used in all-optical relays has become a top priority. The traditional erbium-doped fiber amplifier (EDFA) has the advantages of high gain, high output power, low noise, and polarization-independent, and has good amplification characteristics in the current communication band. [0003] However, with the development of wavelength division multiplexing system research towards larger capacity and longer transmission distance, EDFA has gradually become the "bottleneck" for further improvement of system capacity distance product. First of all, EDFA is limited by erbium ions, providing a gain bandwidth of about 70nm, which only accounts for a small par...

AI Technical Summary

Problems solved by technology

Although silicate and other glass optical fibers have high Raman gain coefficients, they have huge losses, and at the same time, they cannot be well fused with the quartz optical fibers commonly used in existing optical communication systems, so they cannot be practically applied.

However, hafnium-doped silica fiber, niobium-doped silica fiber, and niobium chloride-doped silica fiber can be well connected to existing optical communication systems, but the loss of the fiber itself is high, resulting in Raman gain being offset by loss, which cannot be achieved very well. well amplified signal light

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