Ethernet passive optical network capable of lengthening transmission distance
A passive optical network and transmission distance technology, applied in the field of Ethernet passive optical network, can solve the problem of difficulty in extending the transmission distance of EPON, and achieve the effects of high stability, extended transmission distance and low cost
Active Publication Date: 2012-04-25
WUHAN YANGTZE OPTICAL TECH
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Problems solved by technology
Therefore, it is difficult to extend the transmission distance of EPON
Method used
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Embodiment Construction
[0015] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0016] figure 1 It is a structural diagram of a long-distance Ethernet passive optical network of the present invention, wherein ONU1-3 are near-end ONUs, and ONU4-6 are remote long-distance ONUs. In order to ensure that the optical signal power of communication between OLT and ONU4-6 can be Greater than the receiving sensitivity of the detector, the link between them is added with an EPON optical signal power amplifier. The amplifier provides an uplink optical port and a downlink optical port. The uplink optical port is connected to the OLT through a passive optical splitter. , and the downlink optical port passes through the long-distance optical fiber and then connects to the remote ONU directly through the secondary passive optical splitter or directly. The amplifier simultaneously amplifies the optical signal power of uplink 1310nm and downlink 1490...
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The invention relates to an ethernet passive optical network that can extend transmission distance, which comprises an OLT and an ONU; the OLT is connected with the ONU by a passive optical splitter and an optical fiber; the ethernet passive optical network is characterized in that an EPON optical signal power amplifier is arranged in the link between the OLT and the remote ONU; the EPON optical signal power amplifier provides an upper connecting light port and a lower connecting light port; the upper connecting light port is connected with the OLT by a primary passive optical splitter, and after passing a long distance optical fiber, the lower connecting light port is connected with the remote ONU by a secondary passive optical splitter or directly; the EPON optical signal power amplifier simultaneously performs power amplification for the uplink 1318nm and downlink 1490nm optical signals. The EPON that can extend the transmission distance has the advantages of lower cost and higher stability; by adjusting configuration parameters, the registration of long distance ONU, as well as the request and distribution of bandwidth, is supported.
Description
technical field [0001] The invention relates to an Ethernet passive optical network capable of extending transmission distance, and belongs to the field of optical access networks. Background technique [0002] In the Ethernet passive optical network EPON system, the optical line terminal OLT and the optical network unit ONU are connected through a passive optical splitter. Due to the influence of factors such as uplink and downlink optical signal power and uplink bandwidth allocation algorithm, the transmission distance must not exceed 20km. But in some application occasions, it is necessary to make the transmission distance of EPON break through 20km, reach 50km or even farther. Since the optical power of the signal will be greatly attenuated after long-distance transmission, the power of the uplink and downlink optical signals must be amplified during transmission. EPON uses 1310nm and 1490nm wavelengths for uplink and downlink respectively. Currently, there is no suitabl...
Claims
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IPC IPC(8): H04B10/17H04B10/14H04J14/02H04Q11/00
Inventor 张利胡保民刘武
Owner WUHAN YANGTZE OPTICAL TECH