Title:
OPTICAL COMMUNICATION SYSTEM FOR SIMULTANEOUS TRANSMISSION OF BASIC BAND DIGITAL SIGNAL AND MULTIPLEXED MICROWAVE SUBCARRIER
Document Type and Number:
Japanese Patent JPH02210925
Kind Code:
A
Abstract:
PURPOSE: To carry a voice, data, and video channel, and to simultaneously transmit a basic digital signal and a multiple microwave carrier wave/sub-carrier wave by providing a means for generating a light beam and a means for intensely modulating it as a composite modulated signal. CONSTITUTION: In a hybrid light transmitter having a basic band digital signal source 10 and a microwave signal source 14, the output of the signal source 10 and an output through an attenuator 16 of the signal source 14 are connected by a hybrid coupler 12. Then, the output of the coupler 12 is connected through an attenuator 18 by a laser diode 20 as a composite modulated signal. Then, the diode 20 generates a light beam intensely modulated by a modulation signal from the coupler 12, and this modulated light beam is transmitted to one terminal part of an optical fiber 22. Thus, a voice, data, and video channel can be carried, and a basic digital signal and a multiple microwave carrier wave/ sub-carrier wave can be simultaneously transmitted. Then, information carrying capability can be improved.
Inventors:
ROBAATO ORUSUHANSUKI
Application Number:
JP23739689A
Publication Date:
August 22, 1990
Filing Date:
September 14, 1989
Export Citation:
Assignee:
GTE LABORATORIES INC
International Classes:
H04J14/00; H04B10/155; H04B14/08; H04J1/08; H04J4/00; H04J14/02; (IPC1-7): H04J4/00; H04J14/02
Attorney, Agent or Firm:
Motohiro Kurauchi (1 outside)