Extender box, data transmission method and passive optical network system

A data transmission method, comprising:

• receiving, by at least two uplink data receiving modules, uplink data sent from corresponding first passive optical network (PON) devices respectively;
• sending, by a downlink data sending module, downlink data to the first PON devices;
• converting, by a duplexer, a data transmission mode used by the downlink data sending module and the uplink data receiving modules from dual-fiber transmission to single-fiber transmission to implement single-fiber bidirectional transceiving;
• and
• measuring, by an embedded optical network unit, power and a bit error rate of the uplink data, and reporting, by the embedded optical network unit, a measurement result to a second PON device;
• wherein:
• the uplink data receiving modules have ports that are connected with uplink ports of the first PON devices and correspond to the uplink ports on a one-to-one basis, and
• optical fibers of the uplink data receiving modules that are connected with the uplink ports of the first PON devices are separated from optical fiber of the downlink data sending module, wherein the optical fiber is connected with downlink ports of the first PON devices;
• wherein
• the first PON devices are optical network units (ONUs), the second PON device is an optical line terminal (OLT), the embedded optical network unit is an optical network terminal (ONT), and
• said receiving uplink data sent from a corresponding ONU comprises:
• receiving uplink data sent from a corresponding ONU,
• detecting whether the uplink data is abnormal, and
• when it is detected that the uplink data is abnormal, disconnecting an uplink channel corresponding to the uplink data sent by the corresponding ONU, and reporting to the OLT through the embedded ONT that the corresponding ONU is abnormal so that the OLT commands the corresponding ONU to stop sending uplink optical signals.

A passive optical network (PON) system, comprising first PON devices, an extender box (EB) and a second PON device, the EB comprising:

• a downlink data sending module configured to send downlink data to the first PON devices;
• at least two uplink data receiving modules configured to receive uplink data sent from a corresponding first PON device respectively;
• a duplexer configured to convert a data transmission mode used by the downlink data sending module and the uplink data receiving modules from dual-fiber transmission to single-fiber transmission to implement single-fiber bidirectional transceiving;
• and
• an embedded optical network unit configured to measure power and a bit error rate of the uplink data and report a measurement result to the second PON device;
• wherein:
• the uplink data receiving modules have ports that are connected with uplink ports of the first PON devices and correspond to the uplink ports on a one-to-one basis, and
• optical fibers of the uplink data receiving modules that are connected with the uplink ports of the first PON devices are separated from optical fiber of the downlink data sending module, wherein the optical fiber is connected with downlink ports of the first PON devices, wherein
• the first PON devices are optical network units (ONUs), the second PON device is an optical line terminal (OLT), the embedded optical network unit is an optical network terminal (ONT), and
• said receiving uplink data sent from a corresponding ONU comprises:
• receiving uplink data sent from a corresponding ONU,
• detecting whether the uplink data is abnormal, and
• when it is detected that the uplink data is abnormal, disconnecting an uplink channel corresponding to the uplink data sent by the corresponding ONU, and reporting to the OLT through the embedded ONT that the corresponding ONU is abnormal so that the OLT commands the corresponding ONU to stop sending uplink optical signals.