METHOD FOR TRANSMITTING LOW FREQUENCY SIGNAL IN OPTICAL FIBER COMMUNICATION LINE, METHOD FOR SUPPLYING PUMPING OPTICAL RADIATION TO ACTIVE CORE OPTICAL FIBER OF OPTICAL AMPLIFIER, METHOD FOR TRANSMITTING LOW FREQUENCY SIGNAL TO OPTICAL AMPLIFIER AND OPTICAL AMPLIFIER

Title:

Document Type and Number:

Japanese Patent JP3113244

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To improve the reliability and efficiency of a line by optically connecting the end face of an active core optical fiber part to optical fibers of 1st and 2nd cables, connecting a 1st pumping optical radiation source to one of two end faces of the active cove optical fiber part and making at least one of the end faces of an optical fiber communication line to perform low frequency modulation of optical radiation for signal transmission.
SOLUTION: A coupler 18 that resembles a coupler 17 well is connected to a photodiode 28 through an end face of an optical fiber length part and its other end is connected to a laser 20. Further, the photodiodes 27 and 28 connected to the couplers 17 and 18 are connected to a microprocessor circuit 29 and various circuits that are related to the lasers 19 and 20 are connected to the microprocessor circuit 29 in the same way. When the laser 29 operates, an amplifier outputs a signal VC that is a function of the intensity of pumping optical radiation where the intensity appears on an output of a dichroic coupler 17 through an edge part 26 and sends the signal to the circuit 29.

More Like This:

JPS53102761	PRODUCTION OF OPTICAL FIBER
JP2002504700	Description: Optical Fiber Attenuator and Attenuator System
WO/2006/023525	METHODS OF MAKING AND USING AND APPARATUS AND DEVICES FOR PLACING LIGHT AND SAMPLE IN PHOTO-EMITTING OR ABSORBING DEVICES

Inventors:

Giorgio Grasso
Aldo Righetti
Flavio Fontana

Application Number:

JP12066399A

Publication Date:

November 27, 2000

Filing Date:

July 21, 1990

Export Citation:

Click for automatic bibliography generation Help

Assignee:

Pirelli Cavi e Sistemi S.p.A

International Classes:

G02B6/00; G02F1/35; H01S3/06; H01S3/08; G02B6/44; H01S3/094; H01S3/10; H04B3/46; H04B10/00; H04B17/40; H01S3/067; (IPC1-7): H04B10/17; H01S3/10; H04B3/46; H04B10/08; H04B10/16

Domestic Patent References:

JP62279731A
JP62102585A
JP63261930A
JP2253747A
JP2223237A
JP3258038A
JP6352826B2

Attorney, Agent or Firm:

Yoshiyuki Inaba (2 outside)

Previous Patent: JPH03113243

Next Patent: DEVICE AND METHOD FOR SENSING MOBILE TELEPHONE SET IN PAUSE STATE