System for simultaneous high-efficiency data down-conversion and data modulation using EAM modulator

Abstract

The invention belongs to the technical field of radio-on-fiber (ROF) communication systems, and discloses a system proposal for remotely transmitting local oscillation (LO) signals and simultaneously performing data down-conversion and uplink data modulation with nonlinear characteristics of an EAM. Sidebands of all stages which are sent by a central station are taken as the LO signal, a base station selectively filters by an optical band pass filter so that the base station only needs one EAM and one optical filter to realize data uplink transmission without laser source and local oscillation radio frequency source, thus greatly reducing devices of the base station, and reducing cost of the base station. In the precondition that the central station is not changed, the cost of the whole system can be reduced by changing the base station modulator into the EAM, thus the feasibility of the proposal is high, and the system can be easily realized.

Description

(1) Technical field [0001] The invention belongs to the technical field of a radio-over-fiber (Radio-over-Fiber, abbreviated as ROF) communication system, and uses an electro-absorption modulator (EAM) to simplify the configuration of a base station. (2) Background technology [0002] With the rapid development of digital multimedia technologies such as IPTV and VOD, traditional wireless communication systems cannot meet the growing demand for broadband services. There is an urgent need for a wireless communication method that can improve higher bandwidth. On the other hand, due to the fact that a large number of laid optical fiber cables have not been fully utilized, the development speed of the telecommunications business in the long-distance backbone network and the metropolitan area network has been slow in recent years. Therefore, the millimeter-wave optical fiber wireless communication technology that organically combines the advantages of optical fiber and wireless c...

AI Technical Summary

Problems solved by technology

However, in the above solution, in order to effectively convert the uplink data into the desired IF signal, it is necessary to transmit a large number of optical LO signals from the central station to the base station, which increases the cost of the system to a certain extent

And so far, the results obtained and the expected transmission distance of the IF signal based on the baseband transmission method are very limited

Images