OLT in a symmetrical TWDM‑pon system for high-speed transmission with low-speed optics

Abstract

The invention discloses an OLT (Optical Line Terminal) in a symmetrical TWDM-PON (Time and Wavelength Division Multiplexing-Passive Optical Network) system for realizing high-speed transmission through a low-speed optical device, and relates to the field of fiber optic communications. The OLT comprises a first media control module, a downlink data transmission module, a first optical wavelength division multiplexer and an uplink data receiving module, wherein an uplink and a downlink of the OLT share the first optical wavelength division multiplexer and the first media control module; in a downlink direction, the first media control module, the downlink data transmission module and the first optical wavelength division multiplexer are connected in sequence; and in an uplink direction, the first optical wavelength division multiplexer, the uplink data receiving module and the first media control module are connected in sequence. Through adoption of the OLT, the cost of the system can be lowered remarkably; the complexity of the system is lowered effectively; and difficulty in transmitting data at a high speed in real time is lowered for the system.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an OLT in a symmetrical TWDM-PON system which uses a low-speed optical device to realize high-speed transmission. Background technique [0002] As the country vigorously promotes the "Internet +" policy, the Internet will usher in a new round of rapid development. At the same time, the communication data traffic will also increase rapidly. Optical communication is the mainstream of the transmission network and an important part of the access network. , its capacity demand will continue to increase and develop. Not only that, but the number of Internet users around the world is growing rapidly. In such a big environment, ITU-T (International Telecommunication Union Telecommunication Standardization Sector) organization and IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) organization have started their respectiv...

AI Technical Summary

Problems solved by technology

The main disadvantage of the scheme in this article is that dispersion is not considered in the optical domain, so the subsequent DSP (Digital Signal Processing, digital signal processing) processing is relatively complicated, and the system effect is not ideal

The main disadvantage of this scheme is that although the bandwidth of the receiver is reduced, a wideband modulator is still required at the transmitter; and the signal wavelength is in the O band, which has a very low dispersion coefficient, so this scheme does not consider the dispersion problem

Existing solutions either use high-speed devices to achieve high-speed transmission, and the system cost is very high; or rely heavily on digital signal processing, which dramatically increases the complexity of subsequent data processing, and basically cannot realize real-time operation of the system

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