Optical receiving and combined receiving and transmitting assembly, combined optical module, OLT and PON system

Abstract

The embodiment of the invention provides an optical receiving assembly, a combined receiving and transmitting assembly, a combined optical module, an optical line terminal and a passive optical network system. An optical receiving assembly relates to the technical field of optical communication and comprises a first coaxial tube shell, the first coaxial tube shell is provided with a light inlet, and a first wave separator, a first optical receiver, a second optical receiver and an optical lens group are packaged in the first coaxial tube shell; light entering from the light inlet enters the first wave separator, and the first wave separator is used for transmitting an optical signal with a first wavelength and reflecting an optical signal with a second wavelength; the first optical receiver is arranged on a transmission optical path of the first wave separator and is used for receiving an optical signal with a first wavelength; the optical lens set is arranged on a reflection light path of the first wave separator and used for guiding the optical signal of the second wavelength reflected by the first wave separator to the second optical receiver, and the second optical receiver isused for receiving the optical signal of the second wavelength.

Description

technical field [0001] The present application relates to the technical field of optical communication, and in particular to an optical receiving component, a combined transceiver component, a combined optical module, an optical line terminal and a passive optical network system. Background technique [0002] With the development of modern society, the explosive growth of information, especially the advent of the era of big data, the demand for network throughput continues to increase. With its unique ultra-high bandwidth, low electromagnetic interference and other characteristics, optical transmission has gradually become the mainstream solution of modern communication, especially the newly built network at this stage, the access network represented by fiber-to-the-home, is being deployed on a large scale. [0003] The optical communication network applied to the access network scene mainly exists in the form of Passive Optical Network (PON). Under the overall situation tha...

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Problems solved by technology

Regarding the wavelength of optical signals, the optical line terminal in GPON uses 1490nm for transmission and 1310nm for reception, and the optical line terminal in XGPON uses 1577nm for transmission and 1270nm for reception. It is too likely to re-establish an ODN network, so it is necessary to expand services on the existing network. There must be such a scenario: on the user side, some want to upgrade to XGPON, and some are unwilling to upgrade, then there will be figure 2 In the situation shown, under the same optical fiber distribution network 02, both GPON and XGPON services exist at the same time, such as figure 2 As shown, some of the optical modules in the optical network unit 03 are GPON optical modules, and the optical modules in the other part of the optical network unit 03 are XGPON optical modules, which involves the coexistence of XGPON and the original large-scale GPON optical components.

On the side of the optical line terminal 01, these two types of OLT optical modules are also required, namely GPON optical modules and XGPON optical modules. In such a networking environment, the wavelength division multiplexing (wavelength division multiplexing, WDM) module 04 pairs GPON and XGPON Perform multiplexing and multiplexing of uplink and downlink wavelengths, and in practical applications, if figure 2 If the WDM module 04 is installed externally as shown, the construction cost will be high, the equipment room will occupy a large space, the construction and wiring will be complicated, and management and maintenance will be difficult.

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