Optical fiber communication system and method for converting multi-channel NRZ optical signal to single-channel multi-level optical signal

Abstract

The invention discloses an optical fiber communication system and an optical fiber communication method for converting multiple paths of NRZ optical signals into a single path of multi-level optical signals and relate to the field communication. In the system, N optical intensity modulation modules are used for modulating N paths of NRZ digital electric signals of which a rate is R to N paths of NRZ optical signals with different wavelength, and inputting the signals to a multi-path optical signal coupler through an optical delay line; the multi-path optical signal coupler is used for enablingthe N paths of NRZ optical signals to enter into the same optical fiber line for being transmitted; a multi-path optical signal decoupling device is used for dividing the NRZ optical signals in the optical fiber link into N paths of NRZ optical signals; a 1:N single mode optical coupler is used for inputting the N paths of NRZ optical signals into a photoelectric detector; and the photoelectric detector is used for outputting one multi-level modulated electric signal. With the system and the method provided by the invention, the existing NRZ light intensity modulation module can be rationallyused in the multi-level modulation system, cost is reduced, and wasting of resource is avoided, thus, the system and the method are economic and applicable.

Description

technical field [0001] The present invention relates to the field of optical communication, and specifically relates to an optical fiber communication system and method for converting multi-channel NRZ (Non return to zero, non-return to zero) optical signals into single-channel multi-level optical signals. Background technique [0002] With the rapid development of the Internet, cloud computing, mobile broadband, and data centers, the demand for network transmission bandwidth has shown explosive growth, driving the development of ultra-large-capacity optical transmission systems. In order to increase the capacity of the existing optical transmission system, key technologies such as wavelength division multiplexing technology, digital coherent reception, and low-noise optical amplification are considered to be effective solutions to increase capacity. In terms of long-distance backbone network, since the wavelength division multiplexing technology was introduced into the fiel...

AI Technical Summary

Problems solved by technology

However, the multi-level light intensity modulation format has higher requirements on the linearity of the driving device at the transmitting end, so it requires a higher cost, and a large number of original NRZ light intensity modulation modules that have been produced cannot be applied to the multi-level modulation system, resulting in great waste of resources

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