Optimized guided wave communication system

• US 4,730,888 A
• Filed: 02/20/1986
• Issued: 03/15/1988
• Est. Priority Date: 02/20/1986
• Status: Expired due to Term

• Current Assignee: Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Original Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Inventors: Darcie, Thomas E., Whalen, Matthew S.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/831,461
• Time in Patent Office: 754 Days
• Field of Search: 350/96.15, 350/96.16, 333/109, 333/111, 455/610, 455/612
• US Class Current: 385/24
• CPC Class Codes: H04J 14/08 Time-division multiplex systems

Abstract

The present invention relates to an optimized guided wave microwave or lightwave communication system or network wherein a plurality of directional couplers (14, 17) (a) are disposed along a bus-like wave guiding means (13, 16), and (b) include separate coupling coefficients which are optimized. More particularly, the present invention relates to a guided wave communication system or network including, for example, a head-end unit (15) which is coupled to one end of a bus-like wave guiding means. Separate directional couplers are disposed along the wave guiding means to couple lightwave or microwave signals either (a) into the bus-like wave guiding means (13) from separate transmitters (11), or (b) from a bus-like wave guiding means (16) to separate receivers (12). The directional couplers disposed along a guiding means each include a separate coupling coefficient which is optimized to only couple enough of the lightwave or microwave energy onto or from the associated guiding means so that either (a) the head-end unit receives a minimal signal power level from each transmitter or (b) the receivers receive a minimal signal power level from the head-end unit, respectively, to provide a predetermined bit error rate regardless of their distance from the head-end unit along the associated wave guiding means.

Claims

1. A guided wave communication system or network associated with a plurality of users, the system or network comprising:

a guiding means (16) including a first end for propagating signal waves introduced into the first end thereof; and

a plurality of directional couplers (17) disposed in a spaced apart relationship along the guiding means, each coupler (a) being separately associated with at least one user of the system or network, and (b) being arranged with a separate coupling coefficient for coupling out from the signal power arriving at the coupler in the guiding means only a minimal signal power level which is necessary to provide a signal with a predetermined bit error rate to the at least one user.

2. A guided wave communication system or network according to claim 1 wherein

the guiding means is an optical guiding means for propagating lightwave signals therein;

and

the directional couplers are optical couplers.

3. A guided wave communication system or network according to claim 1 wherein the system or network further comprises:

a second guiding means (13) including a first end and a second end for propagating signal waves towards the second end thereof from each of the plurality of users; and

a plurality of second directional couplers (14) disposed in a spaced apart relationship along the second guiding means, each second coupler (a) being separately associated with at least one user of the system or network and (b) being arranged with a separate coupling coefficient for coupling a selected predetermined signal power level of a signal transmitted by the at least one associated user into the second guiding means such that the signal power from each of the plurality of users of the system or network is only of a minimal power level to provide a predetermined bit error rate at the second end of the second guiding means.

4. A guided wave communication system or network according to claim 3 wherein

the second guiding means is an optical guiding means for propagating lightwave signals therein;

and

the directional couplers are optical couplers.

5. A guided wave communication system or network according to claim 1 wherein

the guiding means is a waveguide for guiding electromagnetic waves;

and

the directional couplers are waveguide directional couplers with each coupler comprising a separate coupling coefficient.

6. A guided wave communication system or network according to claim 3 wherein

the second guiding means is a waveguide for guiding electromagnetic waves;

and

the second directional couplers are waveguide directional couplers with each second coupler comprising a separate coupling coefficient.

7. A guided wave communication system or network associated with a plurality of users, the system or network comprising:

a guiding means (13) including a first end for propagating signal waves from the plurality of users to the first end thereof; and

a plurality of directional couplers (14) disposed in a spaced apart relationship along the guiding means, each coupler (a) being separately associated with at least one of the plurality of users, and (b) being arranged with a separate coupling coefficient for coupling a separate selected portion of the power of a signal transmitted by the associated at least one user into the guiding means such that a predetermined signal power level is delivered to the first end of the guiding means which is only of a minimal power level to provide a predetermined bit error rate from each of the plurality of users regardless of the number of couplers disposed between a user'"'"'s associated coupler and the first end of the guiding means.

8. A guided wave communication system or network according to claim 7 wherein

the guiding means is an optical guiding means for propagating lightwave signals;

and

the directional couplers are optical couplers.

9. A guided wave communicaton system or network according to claim 7 wherein

the guiding means is a waveguide for guiding electromagnetic waves;

and

the directional couplers are waveguide directional couplers with each coupler being arranged with separate coupling coefficient.