Multi-carrier light transmitting method of light access system with multi-path signal

Abstract

Though xDSL technology takes up main share in network access market, but in company with increasing access distance the access rate drops from a few of decade megabit to hundreds kilobit. The invention can keeps maximum access rate of xDSL in a long distance access and includes: a multi-carrier modulation with different frequency is used to transparently pack multi-way xDLS signal to be transmitted, and then optical transceiver outputs the multi-way xDSL signal; the transmission reference signal is used to implement the synchronous demodulation for the multi-way modulation signal; the message interaction channel is used to implement the control and interaction for devices at accessing end and accessed end.

Description

Technical field: [0001] The invention relates to a network access system, in particular to the application of the access system of an analog carrier signal. Background technique: [0002] Broadband access systems are more and more widely used, among which xDSL technology occupies the main share of access, and its number is constantly increasing; however, with the increase of access distance, the data rate of xDSL access will be greatly reduced. The input data rate will drop rapidly from tens of megabits to several megabits, or even hundreds of kilobits, which is far from meeting the needs of users. Road access to new technologies is very much needed. [0003] XDSL has a relatively complete access control protocol and a large number of users. Therefore, when considering a long-distance, high-speed data access multi-user solution, it is best to completely borrow the original protocol of XDSL; if the user access is redefined The process-specific interaction protocol will not ...

AI Technical Summary

Problems solved by technology

[0002] Broadband access systems are more and more widely used, among which xDSL technology occupies the main share of access, and its number is constantly increasing; however, with the increase of access distance, the data rate of xDSL access will be greatly reduced. The input data rate will drop rapidly from tens of megabits to several megabits, or even hundreds of kilobits, which is far from meeting the needs of users. Road access to new technology is very much needed

[0003] XDSL has a relatively complete access control protocol and a large number of users. Therefore, when considering a long-distance, high-speed data access multi-user solution, it is best to completely borrow the original protocol of XDSL; if the user access is redefined The process-specific interaction protocol will not be conducive to the compatible upgrade of the original system, and its difficulty and cost will also increase

[0004] Using multi-carriers to modulate multiple signals into signals of different signal frequencies is a method of single-fiber multiplex transmission, but each carrier needs its corresponding synchronous carrier oscillation signal when demodulating the signal, and simultaneously transmits multiple channels synchronously. The carrier oscillation signal circuit will be more complicated, and it is necessary to find a better synchronous carrier oscillation signal transmission method

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