A kind of multi-core single-mode optical fiber and its manufacturing method

Abstract

The invention relates to a multi-fiber core single-mode optical fiber and a manufacturing method thereof. The multi-fiber core single-mode optical fiber comprises claddings and a plurality of fiber cores. The multi-fiber core single-mode optical fiber is characterized in that the fiber cores include a pumping fiber core and a plurality of signal fiber cores, wherein the pumping fiber core is arranged in the center of the optical fiber, the signal fiber cores are distributed on one to three circumferences around the center at equal intervals, so as to form one to three layers of signal fiber cores, sunken claddings tightly cover each signal fiber core, and common claddings are arranged outside the sunken claddings. The multi-fiber core single-mode optical fiber has the characteristics of low signal crosstalk among all of the signal fiber cores, easiness in online light amplification, simplicity and convenience in manufacturing and low manufacturing cost and is suitable for large-scale production. A distributed Raman amplification technique of the multi-fiber core single-mode optical fiber is used in an ultrahigh-speed communication system, so that effective light amplification can be realized, and the harm of a non-linear effect to the performance of a high-speed optical transmission system is further reduced.

Description

technical field [0001] The invention relates to a multi-core single-mode optical fiber for optical transmission and a manufacturing method thereof. It belongs to the technical field of communication optical fiber. Background technique [0002] With the popularity and rapid growth of global Internet services, people's demand for large-capacity optical transmission networks has further increased. Bandwidth requirements will continue to grow exponentially for at least 15 years. However, even with advanced modulation formats, the capacity of a single optical fiber is still approaching the limit, and the problem of "capacity crunch" is becoming more and more apparent. Without a new major breakthrough, the growth of optical fiber transmission capacity will not be able to keep up with the increasingly busy long-distance links on demand. [0003] In terms of access network, including data center interconnection applications, the increase in the number of user access and the deman...

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Problems solved by technology

[0011] Although the above-mentioned method of utilizing erbium-doped fiber for optical amplification is feasible in theory and in the laboratory, there are many shortcomings: 1. All cores transmit signal light, so the crosstalk of signal light in the middle core has the most serious impact. It is not conducive to signal recovery at the receiving end; 2. Due to the limitation of the characteristics of the erbium-doped optical fiber itself, the amplification bandwidth is fixed, and there are obviously limitations in the working band and bandwidth. It can only amplify the optical bandwidth of about 1550nm, which is not conducive to the expansion of communication bandwidth. It cannot fully meet the requirements of the development of optical communication systems; 3. The noise performance of the erbium-doped fiber amplifier is not particularly ideal. As a discrete optical amplifier, the optical signal is only amplified in the erbium-doped fiber, and the higher power peak is aggravated The accumulation of nonlinear noise is not conducive to the transmission of advanced modulation formats in coherent optical communication systems; 4. For the first amplification scheme mentioned above, each amplification needs to couple light to a single-mode fiber, and then perform the opposite This process will inevitably introduce other noise (mainly increased insertion loss, reflected multipath noise, and increased system cost and complexity), and requires seven erbium-doped fibers, which is cumbersome and does not make full use of multi-core Features and advantages of optical fiber

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