ROF link apparatus capable of stable TDD wireless service

A radio over fiber (ROF) link apparatus for providing a stable TDD wireless service for a time division duplexing (TDD) baseband signal, the ROF link apparatus comprising:

• a central access platform (CAP) for:
• receiving various kinds of data including the TDD baseband signal from upper layers,
• multiplexing the data,
• electro-optically converting the multiplexed data, and
• transmitting the converted data as downstream data through an optical fiber;
• and
• a remote access unit (RAU) for:
• receiving the downstream data through the optical fiber,
• opto-electrically converting the received downstream data to the multiplexed data,
• demultiplexing the multiplexed data,
• performing a wireless access process of the demultiplexed data, and
• transmitting the wireless access processed data to a wireless local area network (WLAN) service terminal through an antenna;
• wherein the CAP does not have WLAN Access Points (APs) disposed therein for TDD communications and the RAU includes a TDD access point (AP) for processing a TDD baseband signal among the demultiplexed signals to an RF signal for WLAN communication;
• and
• wherein the CAP includes:
• a TDD processing unit for receiving the TDD baseband signal from the upper layer and downstream processing the received TDD baseband signal;
• a plurality of radio frequency (RF) processing units for receiving RF signals from the upper layers and downstream processing the received RF signals;
• a multiplexer for multiplexing signals separately output from the TDD processing unit to the multiplexer and from the plurality of RF processing units to the multiplexer into a single electrical signal;
• a first electro-optical converter for converting the electrical signals multiplexed by the multiplexer to an optical signal;
• and
• a transmitter for transmitting the converted optical signal through the optical fiber.