Optimizing method for dual and locked mode optical fiber wireless wave division multiplexing system

Abstract

The invention relates to an optimization method for the radio wavelength division multiplexing system of a double-mode locked-mode optical fiber. In a base station, a light beam splitter is used for splitting a downlink signal which is sent to the base station by a junction center into two beams of signals, wherein, one beam of signal passes through a photorectifier, an amplifier and a filter and then is send out by an antenna; the other beam of signal passes through an optical isolator and then is sent to a multimode laser. The multimode laser separates single sideband optical carrier signals without the downlink signal from the signals, and then the single sideband optical carrier signals are sent into an external modulator. Uplink data signals after the frequency conversion are modulated by the external modulator on the single sideband optical carrier signals, and then conveyed to the junction center through the optical fiber. By adopting an optical branching device and a multimode laser, a carrier wave is extracted from the dual wavelength of downlink carrier data in the base station for loading uplink data, thus the equipment and the link are not required to be additionally provided for sending the carrier wave which is used by the uplink data. The optical radio system of the invention has good feasibility and saves system resources while improving the system efficiency.

Description

technical field [0001] The invention belongs to the technical field of radio-over-fiber (Radio-over-Fiber, abbreviated as ROF) communication system, and specifically relates to the optimization of a system using dual-mode mode-locked optical fiber wireless wavelength division multiplexing technology. Background technique [0002] The communication frequency adopted by the next-generation ultra-wideband wireless communication technology will extend to the millimeter wave band. In order to overcome the limitation of wireless communication transmission distance and meet the broadband requirements in wireless communication, the existing optical fiber communication technology must be used. Radio-over-Fiber (ROF) technology fully combines the high bandwidth of optical fiber and the flexibility of high-frequency wireless transmission technology, and integrates wireless and optical networks into a network that can increase access network capacity and mobility. , and a new type of ac...

AI Technical Summary

Problems solved by technology

Each base station needs two light sources occupying two optical channels to transmit uplink and downlink signals. The generation of these two light sources requires two wavelength division multiplexing light sources and two single-mode lasers with specified wavelengths, one of which is sent to The base station is only used as the carrier of the uplink signal, using too many wavelength division multiplexing light sources, resulting in low efficiency of the entire system and a high cost

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