Wavelength division multiplexer and passive optical network system

Abstract

Relating to the field of optical communications and disclosed in the embodiments of the present invention are a wavelength division multiplexer and passive optical network system for use in optical fibre communication and resolving both the storage problems caused by wavelength division multiplexers requiring different final-stage center wavelengths,and difficulties of deployment.The multistage beam-splitting passive optical network system provided in the embodiments of the present invention comprises:an optical line terminal;beam-splitting components used to split received optical signals into M branches;M wavelength division multiplexers having M common ports and N branch ports,the M wavelength division multiplexers respectively using different common ports to receive a branch optical signal,then sending each such received optical signal downstream after splitting same;M partial reflectors,each disposed on one of the M branches respectively and also at one side near the beam-splitting components so as to constitute,with the wide spectral gain laser of the optical network unit,a self-injecting laser,and to send upstream the signals modulated by the laser.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a wavelength division multiplexer and a passive optical network system. Background technique [0002] Wavelength division multiplexed passive optical network (WDM-PON for short) has information security similar to point-to-point communication and can provide huge bandwidth capacity. The network includes an optical line terminal (Optical Line Terminal, referred to as OLT), which provides a network side interface of the optical access network and distinguishes wavelengths of multiple optical signals used to send downlink data; an optical network unit (Optical Network Unit, referred to as ONU) ), located at the user side and distinguishing the wavelengths of a plurality of optical signals for sending uplink data; The division multiplexer can be an Arrayed Waveguide Grating (AWG for short) or a Waveguide Grating Router (WGR for short), and the wavelength division multiplexer dis...

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Problems solved by technology

[0005] However, because the ONUs connected by the four wavelength division multiplexers require optical signals of different wavelengths, the four wavelength division multiplexers contain different center wavelengths, which will cause serious storage problems. Secondly, each wavelength division multiplexer It is also necessary to connect with each branch in a one-to-one correspondence, which cannot be confused, which greatly increases the difficulty of deployment and the probability of connection errors

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