Non-relay optical fiber transmission system and method

Abstract

The invention discloses a non-relay optical fiber transmission system and method. The non-relay optical fiber transmission system comprises the following components that are sequentially connected with one another by transmission optical fibers: an optical transmitter, an optical power amplifier, an optical pulse expander, an optical fiber, a high-power optical fiber amplifier, a chromatic dispersion compensation module, an optical pulse compressor, a remotely-pumped optical preamplifier, a distributive optical fiber Raman amplifier, an optical preamplifier, a nonlinear optical loop mirror and an optical receiver. The remotely-pumped optical preamplifier is connected with a remotely-pumped source; and the distributive optical fiber Raman amplifier mainly consists of a Raman pumping source, a wavelength division multiplexer and an optical signal transmission fiber arranged behind the remotely-pumped optical preamplifier. In the invention, a linear chirped fiber grating is used for carrying out time-domain broadening on picosecond optical pulse; the picosecond optical pulse is amplified by the high-power amplifier and is transmitted in the optical fiber; the reversely arranged linear chirped fiber grating is used for compressing the time-domain expanded pulse and recovering the time-domain expanded pulse as the picoscond pulse, thus obtaining time spread gain, thereby leading the transmission distance of the non-relay optical fiber transmission system to be extended.

Description

technical field [0001] The invention relates to the field of optical fiber transmission, in particular to a non-relay optical fiber transmission system and method. Background technique [0002] At present, the solution of the non-relay optical fiber transmission system at home and abroad is to use the remote pump EDFA optical power amplifier at a distance of tens of kilometers (50-70km) from the side near the transmitter, and use a remote pump EDFA optical power amplifier at a distance of 100 kilometers (110- 140km) using a remote pump EDFA optical preamplifier, and a distributed optical fiber Raman amplifier on the receiver side. Since the pump light with a wavelength of 1480nm at the transmitter needs to travel tens of kilometers (50-70km) to reach the remote pump EDFA optical power amplifier, and during long-distance transmission, the optical fiber will be affected by the stimulated Raman scattering effect , most of the energy of its pump light will be transferred to the...

AI Technical Summary

Problems solved by technology

Therefore, in the current solutions for unrepeated optical fiber transmission systems, the useful 1480nm wavelength pump light power is very low, which limits the output power of the far-pumped EDFA optical power amplifier near the transmitting end; and the far-pumped EDFA optical power amplifier near the receiving end The input sensitivity of the preamplifier is limited, which leads to the limitation of the transmission distance between the remote-pumped EDFA optical power amplifier and the remote-pumped EDFA optical preamplifier, and the transmission distance of the entire unrepeated optical fiber transmission system is also limited.

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