Optical transmission system, mode coupler and optical transmission method

摘要

Disclosed is an OLT optical transmission system, which includes: an OLT optical transceiver module configured to send downlink light to a first single-mode waveguide module and receive uplink light input by a multimode waveguide module, the first single-mode waveguide module configured to send the received downlink light to a beam splitting/combination module; the beam splitting/combination module configured to perform beam splitting on the received downlink light to obtain multiple beams of downlink light, send the multiple beams of downlink light to corresponding second single-mode waveguide modules respectively, perform beam combination on multiple beams of received uplink light to obtain one beam of uplink light and send the combined uplink light to the multimode waveguide module; the second single-mode waveguide modules configured to send the multiple beams of received downlink light to multiple corresponding ODNs and send the multiple beams of received uplink light to the beam splitting/combination module; and the multimode waveguide module configured to send the received uplink light to the OLT optical transceiver module the invention discloses a mode coupler and an optical transmission method. By the disclosure, uplink and downlink light multiplexing may be implemented, and in addition, uplink light insertion loss may be reduced.

主权项

1. An Optical Line Terminal (OLT) optical transmission system, comprising an OLT optical transceiver module, a first single-mode waveguide module, a beam splitting/combination module, a multimode waveguide module and multiple second single-mode waveguide modules, wherein
the OLT optical transceiver module is configured to send downlink light to the first single-mode waveguide module and receive uplink light input by the multimode waveguide module; the first single-mode waveguide module consists of single-mode waveguides, and is configured to send the downlink light sent by the OLT optical transceiver module to the beam splitting/combination module; the beam splitting/combination module is configured to perform beam splitting on the downlink light sent by the first single-mode waveguide module to obtain multiple beams of downlink light, send the multiple beams of downlink light to the multiple second single-mode waveguide modules respectively, perform beam combination on multiple beams of uplink light sent by the multiple second single-mode waveguide modules to obtain one beam of uplink light and send the combined uplink light to the multimode waveguide module; the multimode waveguide module consists of multimode waveguides, and is configured to send the combined uplink light sent by the beam splitting/combination module to the OLT optical transceiver module; and each of the multiple second single-mode waveguide modules consists of single-mode waveguides, and is configured to send one beam of downlink light sent by the beam splitting/combination module to a corresponding Optical Distribution Network (ODN), and send one beam of uplink light sent by the corresponding ODN to the beam splitting/combination module.