Method and apparatus for duplex communication in hybrid fiber-radio systems

a technology of hybrid fiber and radio system, applied in the field of methods and apparatus for duplex communication in hybrid fiberradio system, can solve the problems of high equipment cost, inability to use high-end, high-end, and complex outdoor base stations including sdh/sonet compliant equipment, etc., and achieve the effect of enabling duplex communication

a technology of hybrid fiber and radio system, applied in the field of methods and apparatus for duplex communication in hybrid fiberradio system, can solve the problems of high equipment cost, inability to use high-end, high-end, and complex outdoor base stations including sdh/sonet compliant equipment, etc., and achieve the effect of enabling duplex communication

US20080232799A1Inactive Publication Date: 2008-09-25SAMSUNG ELECTRONICS CO LTD
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  • Method and apparatus for duplex communication in hybrid fiber-radio systems
  • Method and apparatus for duplex communication in hybrid fiber-radio systems
  • Method and apparatus for duplex communication in hybrid fiber-radio systems

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Embodiment Construction

[0025]Korean Patent Application No. 2002-22704, filed on Apr. 25, 2002, and entitled: “Method And Apparatus For Duplex Communication In Hybrid Fiber-Radio System” is incorporated by reference herein in its entirety.

[0026]The present invention will now be described more fully with reference to the accompanying drawings, in which preferred embodiments of the invention are shown.

[0027]FIG. 1 illustrates a configuration of a central station in a hybrid fiber-radio system for duplex communication. The central station includes a master laser 12 and a slave laser 16. A radio frequency source unit 11 generates electrical signals at a radio frequency and is connected to the master laser 12. The radio frequency source unit 11 drives the master laser 12 using a direct modulation method. An optical signal output from the master laser 12 is injected into the slave laser 16 by the routing operation of an optical circulator 17, and mode locks the slave laser 16. A modulated data signal from a modu...

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Abstract

An apparatus and method for enabling cost-effective duplex communication by diplexing one of down stream signals for frequency up-conversion in a hybrid fiber-radio system includes diplexing an unmodulated mode signal among beating signals between a master laser and an injection-locked slave laser and using the diplexed signal for down-conversion in upstream transmission, thereby eliminating the need for expensive high-frequency local oscillators for frequency conversion. Higher radio frequency signals can be generated using beating between basic modes and satellite modes such as FWM conjugates of the master laser and slave laser. Cost-effective systems, stabilization of a light source and improved transmission performance may be achieved by using a diplexer instead of an expensive high-frequency local oscillator.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a divisional application based on pending application Ser. No. 10 / 423,760, filed Apr. 25, 2003, the entire contents of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method and apparatus for enabling cost-effective duplex communication by diplexing one of down stream signals for frequency upconversion in a hybrid fiber-radio system.[0004]2. Description of the Related Art[0005]Increasing demands for new mobile internet services including video and interactive services have resulted in the exhaustion of the available frequency band for wireless communications, and so triggered the development of the 4th generation wireless communication system. As the next generation communication system of the IMT-2000 (International Mobile Telecommunication), micro / millimeter-wave communication utilizing signals in the band of 3 GHz to 300 GHz is drawing a...

Claims

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Application Information

Patent Timeline
25 Sep 2008
Publication
US20080232799A1
IPC
H04B10/24; H04J14/00; H04B10/00; H04B10/508; H04B10/548; H04B10/58; H04J14/02
CPC
H04B10/25752; H04B10/25; H04B10/2575
Inventors
KIM, A-JUNG