System and method for implementing doubling of wavelength use ratio of WDM passive optical network

Abstract

The invention provides a system and a method for doubling the utilization rate of the wavelength by a wavelength division multiplex passive optical network. The system is formed by the mode that an OLT is connected with an RN through a single mode fiber, and the RN is connected with a plurality of ONUs; the ONUs with the number of 2N are divided into a first set of the ONUs and a second set of the ONUs, the number of the ONUs in each set is equal, the wave bands of uplink signals and downlink signals in the two sets of the ONUs are opposite and are not affected; and the RN is respectively connected with the two sets of the ONUs to realize the separation of the downlink signals of the two sets of the ONUs and the combination of the uplink signals and the back pass of the feed light. The method utilizes the system, and divides the usable wave band into a wave band A and a wave band B; and the first set of the ONUs utilize the wavelength of the wave band A to bear the upstream signals and the feed light thereof and utilizes the wavelength of the wave band B to bear the downstream signals, and the second set of the ONUs are opposite, thereby solving the problem that the feed light andthe downstream signals are positioned in the same wave band and are mixed so that the ONUs can not be separated, and doubling the utilization rate of the wavelength.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an external injection-locked spectrum division WDM-PON system and method for wavelength division multiplexing passive optical network capable of doubling wavelength utilization. Background technique [0002] Wavelength division multiplexing passive optical network WDM-PON technology can upgrade the bandwidth without changing the physical infrastructure equipment, greatly improve the transmission capacity of the network, and has broad application prospects in the optical access network. The wavelength division multiplexing passive optical network WDM-PON system based on external injection locking frequency spectrum division is a very common type used in various wavelength division multiplexing passive optical network WDM-PON systems. The WDM-PON system of the division multiplexing passive optical network also mostly adopts this type, so the present invention plays a very impor...

AI Technical Summary

Problems solved by technology

It can be seen that among all available wavelengths in the above network, half can only be used to transmit uplink signals and their seed light, while the other half can only be used to transmit downlink signals, so it is impossible to realize bidirectional uplink and downlink signals on the same wavelength. Transmission, the system is actually in a "half-duplex" working state

In the above network, each optical network unit ONU needs to occupy a wavelength for uplink and downlink, so the maximum number of optical network units ONU allowed in the network is only half of the number of wavelengths, resulting in the network scale being limited by the actual connectable optical network unit ONU severe limitations on the number

None of the existing solutions can solve the problem of low wavelength efficiency, that is, the number of optical network units ONU is only half of the number of available wavelengths

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