Four-port circulator for single-fiber bidirectional communication and optical module

Abstract

The invention relates to a four-port circulator for single-fiber bidirectional communication and an optical module, the four-port circulator comprises a circulator core, a first port, a second port, a third port and a fourth port, the circulator core is used for transmitting a first polarized light signal incident from the first port to the second port and outputting the first polarized light signal from the second port, the circulator core is used for converting first polarized light incident from the second port into second polarized light through the polarization conversion assembly, transmitting the second polarized light to the third port and outputting the second polarized light from the third port, and the circulator core is used for transmitting the second polarized light incident from the second port to the fourth port and outputting the second polarized light from the fourth port; and an isolation device is arranged between the first port and the circulator core and is used for preventing the optical signal from returning to the first port. According to the four-port circulator, the application of coherent technology is realized, the isolation performance of stray light is improved, the assembly difficulty is small, the stability performance is good, and the integration level is high.

Description

technical field [0001] The invention belongs to the field of optical communication, and in particular relates to a four-port circulator and an optical module for single-fiber bidirectional communication. Background technique [0002] In optical communication, the sending and receiving of optical signals requires optical fiber for transmission, and the laying of long-distance optical fiber is a huge project. Usually, the same transmission distance requires two different optical fibers to send and receive optical signals respectively. Although a lot of multiplexing research has been carried out to increase the channel capacity of optical fiber to improve the utilization of optical fiber resources, it is far from keeping up with the huge demand for optical fiber resources in the development of optical communication. [0003] The single-fiber bidirectional optical module can realize the transmission and reception of optical signals with only one optical fiber, saving half of th...

AI Technical Summary

Problems solved by technology

[0005] However, since the TX transmission device port of the optical circulator in the prior art is generally not provided with an isolation device, stray light has a certain impact on the transmission device, and the three-port optical circulator in the prior art cannot realize the application of coherent technology. In addition, the optical circulators in the prior art have problems such as large size, complicated packaging, high cost, and low integration

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