Compact-size optical amplifier having separate functions

• US 5,515,200 A
• Filed: 10/28/1993
• Issued: 05/07/1996
• Est. Priority Date: 10/30/1992
• Status: Expired due to Fees

• Current Assignee: Avanex Corporation (Lumentum Holdings Inc.)
• Original Assignee: Pirelli Cavi S.p.A. (Pirelli & C SPA)
• Inventors: Vanoli, Stefano, Delrosso, Giovanni, Armiraglio, Massimo
• Primary Examiner(s): Hellner, Mark
• Application Number:
  US08/144,820
• Time in Patent Office: 922 Days
• Field of Search: 385/135, 385/88, 385/89, 385/92, 359/341
• US Class Current: 359/341.1
• CPC Class Codes: H01S 3/06704 Housings; Packages
• CPC Class Codes: H01S 3/06754 Fibre amplifiers H01S3/06708 takes precedence
• CPC Class Codes: H04B 10/291 in which processing or amplification is carried out without conversion of the main signal from optical form
• CPC Class Codes: H04B 10/2912 characterised by the medium used for amplification or processing
• CPC Class Codes: H04B 2210/003 Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators

Abstract

An optical amplifier (1) includes optical components including at least one optical amplifying active fiber and a pump laser supplying pumping power to the amplifying fiber through an optical coupler, light guide sections (14) for connecting the optical components, and electronic and electrical power supply and control components (41,42). The amplifier is characterized in that it includes:

an optical unit (15) including all the optical components (2-13) and the connection light guide sections (14),

an electronic unit (16) including all the electronic and electrical components (41,42) and being separate from the optical unit (15),

a plate between the optical unit and the electronic unit; and

electrical interconnections (43,44) between the optical unit (15) and the electronic unit (16).

The clear separation of the electronic components (41,42) from the optical components (2-13) affords size reductions and rationalization of the amplifier (1) implementation procedure.

Claims

1. An optical amplifier comprising:

an electronic unit comprising a plurality of electrically operable electronic components mounted on a support, said electronic unit being without optical components;

an optical unit comprising at least one active optical amplifying fiber, a laser pump for supplying pumping power to said fiber, optical coupling means coupling said pump to said fiber and light guide sections interconnecting optical components, all mounted on an organizer frame, said optical unit being without electronic components;

a plate intermediate said electronic unit and said optical unit, said plate having an aperture therein for the passage of electrical conductors; and

electrical conductors extending from optical components on said organizer frame through said aperture to electronic components on said support

whereby the electronic components can be assembled on said support independently of the assembly of said optical components on said organizer frame and the amplifier can be assembled by bringing the optical unit and the electronic unit together with said plate therebetween and providing electrical connections of said electrical conductors to the respective components.

2. An optical amplifier according to claim 1, wherein the optical (15) and electronic (16) units and said plate (38) are superimposed and the electrical conductors (43,44) extend substantially vertically from said organizer frame to said electronic components on said support.

3. An optical amplifier according to claim 2, wherein said support comprises an electronic circuit board (41).

4. An optical amplifier according to claim 3, wherein said electrical conductors comprise pins (43) extending vertically upwards from the optical unit (15) and further comprising mating receiving and/or soldering sockets (44) formed on said electronic circuit board (41).

5. An optical amplifier according to claim 1, wherein the optical components further include a directional coupler (2,12) associated with a respective optical meter (3,13), and an optical isolator (4,11), and wherein the optical unit (15) further comprises:

a base plate (17);

said organizer frame (18) is mounted on said base plate (17);

a winding drum (22,23), said active optical amplifying fiber (7,10), being wound on said drum which is mounted on the underside of the organizer frame (18);

a window (29) through the organizer frame (18) for securing the laser pump (26) on the plate (17), and extending through the organizer frame (18);

a socket (33) formed on the organizer frame (18) for securing the optical meter (3,13);

receiving sockets (24,25,34) formed on the organizer frame (18) for the optical coupling means (5,8), the directional coupler (2,12), and the insulator (4,11);

openings (35) formed through the organizer frame (18) to pass the light guide sections therethrough; and

gathering means (36,37) provided on the organizer frame (18) top to gather up the connection light guide sections (14).

6. An optical amplifier according to claim 5, wherein the gathering means comprise a raised peripheral top edge (36) on the organizer frame resulting in the organizer frame (18) top having a substantially tray-like shape.

7. An optical amplifier according to claim 6, wherein the peripheral edge (36) is formed with inwardly projecting elevations.

8. An optical amplifier according to claim 5, wherein the pump laser source (6,9) is set askew centrally of the organizer frame (18) and the plate (17).

9. An optical amplifier according to claim 5, having two amplification stages and comprising two active optical amplifying fibers (7,10) and two winding drums (22,23), each fiber being stored on a respective one of two winding drums (22,23), said drums being mounted side-by-side on the underside of the organizer frame (18).