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1. US5959767 - Loss-less optical cross-connect

Office United States of America
Application Number 08777890
Application Date 31.12.1996
Publication Number 5959767
Publication Date 28.09.1999
Grant Number 5959767
Grant Date 28.09.1999
Publication Kind A
IPC
H04B 9/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
9Transmission systems employing electromagnetic waves other than radio waves, e.g. light, infra-red
H04J 14/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
14Optical multiplex systems
G02B 6/00
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
H01S 3/06
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
H01S 3/10
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H04B 10/02
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
02Details
CPC
H04Q 11/0005
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
H04Q 2011/0011
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
0007Construction
0011using wavelength conversion
H04Q 2011/0013
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
0007Construction
0013using gating amplifiers
H04Q 2011/0015
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
0007Construction
0015using splitting combining
H04Q 2011/0018
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
0007Construction
0018using tunable transmitters or receivers
H04Q 2011/0039
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
QSELECTING
11Selecting arrangements for multiplex systems
0001using optical switching
0005Switch and router aspects
0037Operation
0039Electrical control
Applicants Lucent Technologies
Inventors Fatehi Mohammad T.
Knox Wayne Harvey
Agents Murgia Gregg J.
Title
(EN) Loss-less optical cross-connect
Abstract
(EN)

A loss-less optical cross-connect advantageously employs a plurality of optical rare earth-doped fiber optical amplifiers as gain-switched optical connections, for example, gain-switched optical distributors and gain-switched optical selectors. Each of the optical rare earth-doped fiber optical amplifiers acts as an ON/OFF switch. Also, both the gain-switched optical distributors and selectors employed in the optical cross-connect arrangement of this invention are a natural fit into today's optically amplified optical communication systems. In one embodiment, this is realized by employing a pump select circuit in conjunction with a plurality of pumps and the plurality of corresponding rare earth-doped fiber optical amplifiers. The particular pump and corresponding optical amplifier are selected by use of a control circuit arrangement to determine which output port or ports is (are) connected to the input port. The rare earth-doped fiber optical amplifiers and the corresponding pumps are employed advantageously for both the gain-switched optical distributors and the gain-switched optical selectors. In another embodiment, a so-called tuned pump arrangement is employed in conjunction with a plurality of filters and a corresponding plurality of rare earth-doped fiber optical amplifiers. A pump tuning arrangement is employed to control the tunable pump in order to select the appropriate one of a plurality of optical amplifiers to be activated, thus routing the input signals at any of a plurality of given wavelengths to the corresponding output line (or lines if broadcasting capability is employed). Again, the rare earth-doped fiber optical amplifiers and the corresponding pumps are employed advantageously for both the gain-switched optical distributors and the gain-switched optical selectors.