Optical network unit, optical line terminal, passive fiber-optic access network and its transmission

Abstract

The optical network unit comprises: multi wavelength light source and light spectrum spreader. The multi wavelength light source is used to convert the electrical signals into multi wavelength light signals and to send them to the light spectrum spreader; the light spectrum spreader is used to modulate the multi wavelength light signal into spectrum-spreading signals and to send out them. The optical line terminal comprises a light receiver comprising a light de-spreader, a photoelectronic switching module; the light spreader is used for receiving the spectrum-spreading signal, demodulating out light signals and transmitting relevant light pulse to the photoelectronic switching module; the photoelectronic switching module is used to convert the light pulse sequence into electric signals. The passive optical access network comprises: optical line terminal, optical distribution network, optical network unit. The transmission method of the passive optical fiber access network is: transmitting downlink data by using TDM broadcasting way; transmitting uplink data by using CDMA way.

Description

technical field [0001] The present invention relates to the technical field of optical access network (OAN, optical access network), in particular to an optical network unit (ONU, Optical Network Unit), an optical line terminal (OLT, Optical Line Terminal) and a passive optical access network (PON , Passive Optical Network) and its transmission method. Background technique [0002] OCDMA (Optical Code Division Multiple Access, Optical Code Division Multiple Access) technology is a relatively new optical communication technology. The theoretical basis in mathematics is the same as that of CDMA technology in wireless communication. Construct a series of orthogonal codes (or quasi-orthogonal codes) as the user's spread spectrum address code (the spread spectrum address code can be an optical wavelength sequence, an optical pulse delay sequence or even an optical phase offset sequence, etc., as long as they are mathematically Orthogonal or quasi-orthogonal), the baseband signal...

AI Technical Summary

Problems solved by technology

[0004] TDM / TDMA technology has the disadvantage of low inherent frequency. At the same time, the channel bandwidth in the uplink direction of TDMA is narrow, and the bandwidth of a single user is limited, which limits the application of two-way large bandwidth, and the system capacity is not ideal; it requires time synchronization of the entire network , difficult to implement; poor scalability, waste of resources

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