CN103383480B - Optical-fiber coupling connector and manufacture method thereof - Google Patents

Abstract

An optical fiber coupling connector, comprising a photoelectric unit having a light-emitting surface and a light-receiving surface, a planar optical waveguide, a ceramic substrate substrate, and a circuit board, the ceramic substrate has opposite first and second surfaces, and the circuit board has an opposite third surface and the fourth surface, the photoelectric unit is electrically arranged on the second surface of the ceramic substrate by the COB process, and the light-emitting surface and the light-receiving surface face the third surface of the circuit board, the planar optical waveguide is located on the third surface of the circuit board, and the ceramic substrate A reflection unit is arranged between the circuit board and the light emitted by the light-emitting surface of the photoelectric unit is reflected by the reflection unit and then coupled into the planar light waveguide. The light emitted by the planar light waveguide is reflected by the reflection unit and received by the light-receiving surface of the photoelectric unit. The present invention also provides a manufacturing method of the above optical fiber coupling connector.

Description

Optical fiber coupling connector and method of manufacturing the same

technical field

The invention relates to an optical fiber coupling connector and a manufacturing method thereof.

Background technique

With the development of cloud technology, high-speed transmission systems with higher and higher bandwidths will be required in the future. At present, IBM is committed to developing the use of planar optical waveguides to replace the traditional copper wire structure, and to use light to transmit high-speed signals instead of transmitting high-speed signals by electricity in the past.

The currently proposed planar optical waveguide architecture is to integrate laser diodes or light-emitting diodes, photodetectors and corresponding driving circuits on an LTCC (low temperature co-fired ceramic, low temperature co-fired ceramic substrate), and it is necessary to set through holes on the LTCC to Align the light window of the laser diode or light-emitting diode and the photodetector with the LTCC. After the light passes through the LTCC, the light in the vertical direction is converted into light in the horizontal direction by a reflection unit, and then coupled into the planar optical waveguide for long-distance transmission.

Due to the relatively small size of laser diodes or light-emitting diodes, photodetectors, and corresponding drive circuits, the precision of the through holes is very high. In addition to the small aperture, high precision is also required, so that the optical fiber coupling The cost of the connector is higher.

Contents of the invention

In view of this, it is necessary to provide a low-cost, high-yield optical fiber coupling connector and a manufacturing method thereof.

An optical fiber coupling connector, comprising a photoelectric unit, a planar optical waveguide, a ceramic substrate substrate and a circuit board, the photoelectric unit has a light-emitting surface and a light-receiving surface, the ceramic substrate has opposite first surfaces and second surfaces, the The circuit board has opposite third surfaces and fourth surfaces, the photoelectric unit is electrically arranged on the second surface of the ceramic substrate by COB process, and the light-emitting surface and the light-receiving surface face the third surface of the circuit board. surface, the planar optical waveguide is located on the third surface of the circuit board, a reflection unit and a lens are arranged between the ceramic substrate and the circuit board, the lens is arranged on the reflection unit, and the optoelectronic The light emitted by the light-emitting surface of the unit is reflected by the reflective unit and then coupled into the planar light waveguide, and the light emitted by the planar light waveguide is reflected by the reflective unit and then received by the light-receiving surface of the photoelectric unit.

A method for manufacturing an optical fiber coupling connector, the optical fiber coupling connector includes a photoelectric unit, a ceramic substrate and a circuit board, the circuit board has a planar optical waveguide, and a reflector is provided between the ceramic substrate and the circuit board A unit and a lens, the lens is arranged on the reflection unit, and the manufacturing method of the optical fiber coupling connector includes the following steps: the photoelectric unit is arranged on the surface of the ceramic substrate by COB process; A ball grid array is arranged on the substrate; the ceramic substrate is turned over so that the photoelectric unit faces the planar light waveguide on the circuit board; the ceramic substrate and the circuit board are connected by the ball grid array.

Compared with the prior art, the optoelectronic unit of the optical fiber coupling connector of this embodiment is arranged on the substrate by COB process, and the light-emitting surface and the light-receiving surface both face the circuit board, so that there is no need to set a through hole with high precision on the substrate. The optical coupling between the photoelectric unit and the planar optical waveguide can be realized. Therefore, the cost of the fiber coupling connector is relatively low, and since the photoelectric unit is arranged on the substrate using a COB process, the yield of the fiber coupling connector is high.

Description of drawings

FIG. 1 is a schematic diagram of an optical fiber coupling connector according to an embodiment of the present invention.

Description of main component symbols

Fiber Coupler 100

Ceramic Substrate 10

first surface 11

second surface 12

Photoelectric unit 13

LED 130

chip 131

circuit board 20

third surface 21

Fourth Surface 22

Planar light guide 30

Reflex unit 40

lens 50

Ball Grid Array 60

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Referring to FIG. 1 , an optical fiber coupling connector 100 provided by an embodiment of the present invention includes a ceramic substrate 10 , a circuit board 20 , a planar optical waveguide 30 , a reflection unit 40 and a lens 50 .

The ceramic substrate 10 may be a low temperature co-fired ceramic substrate (low temperature co-fired ceramic), which has a first surface 11 and a second surface 12 opposite to each other, and a photoelectric unit 13 is electrically disposed on the second surface 12 . The photoelectric unit 13 includes a light-emitting diode 130, a chip 131 and a photodiode (not shown in the figure). The faces are all facing the circuit board 20 .

The chip 131 is used to drive the light emitting diode 130 to emit light and process the electrical signal output by the photodiode. Of course, in other implementation manners, the chip 131 can also be divided into two independent ones, which respectively drive the light emitting diode 130 to emit light and process the electrical signal output by the photodiode.

The circuit board 20 is electrically connected to the ceramic substrate 10 through a ball grid array (BGA) 60 , and the circuit board 20 can be a printed circuit board or a flexible circuit board. The circuit board 20 has opposite third surface 21 and fourth surface 22 , the third surface 21 faces the second surface 12 of the ceramic substrate 10 , in other words, the third surface 21 faces the light-emitting surface of the LED 130 and the light-receiving surface of the photodiode.

The planar optical waveguide 30 is disposed on the third surface 21 of the circuit board 20 for coupling with the photoelectric unit 13 to realize light transmission.

The lens 50 and the reflective unit 40 are disposed between the ceramic substrate 10 and the circuit board 20 , and the reflective unit 40 is located on the third surface 21 of the circuit board 20 , and the lens 50 is disposed on the reflective unit 40 .

During the optical signal transmission process of the optical fiber coupling connector 100, the chip 131 drives the light-emitting diode 130 of the photoelectric unit 13 to emit light that is substantially perpendicular to the ceramic substrate 10, and the light is incident on the lens 50, and the light emitted from the lens 50 is reflected by the reflection unit 40 The light becomes substantially parallel to the circuit board 20 , and the light substantially parallel to the circuit board 20 enters the planar optical waveguide 30 for transmission. Similarly, the optical signal emitted from the planar optical waveguide 30 is reflected by the reflection unit 40 and then incident on the lens 50, the light emitted from the lens is received by the photodiode and converted into an electrical signal, and the chip 131 processes the electrical signal to obtain a fiber-optic coupling connection The signal transmitted by the device 100.

In the manufacturing process, the photoelectric unit 13 is arranged on the second surface 12 of the ceramic substrate 10 by COB process, and then the ball grid array 60 is arranged on the ceramic substrate 10, and the ceramic substrate 10 is turned over so that the photoelectric unit 13 faces the circuit board 20 The planar optical waveguide 30 is connected to the ceramic substrate 10 and the circuit board 20 through the ball grid array 60 .

The light-emitting surface and the light-receiving surface of the photoelectric unit 13 of the fiber-optic coupling connector 100 are both facing the circuit board 20, and there is no need to set a through hole with high precision on the ceramic substrate 10, so that the photoelectric unit 13 and the planar optical waveguide 30 can realize optical communication. Coupling, so that the cost of the optical fiber coupling connector 100 is lower; and because the photoelectric unit 13 is disposed on the ceramic substrate 10 using a COB process, the yield rate of the optical fiber coupling connector 100 is higher.

It can be understood that those skilled in the art can also make other changes within the spirit of the present invention to be used in the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (6)

1. A fiber coupling connector, comprising a photoelectric unit, a planar optical waveguide, a ceramic substrate and a circuit board, the photoelectric unit has a light-emitting surface and a light-receiving surface, and the ceramic substrate has opposite first and second surfaces, so The circuit board has opposite third surface and fourth surface, the photoelectric unit is electrically arranged on the second surface of the ceramic substrate by COB process, and the light-emitting surface and the light-receiving surface face the first surface of the circuit board Three surfaces, the planar optical waveguide is located on the third surface of the circuit board, a reflective unit and a lens are arranged between the ceramic substrate and the circuit board, the lens is arranged on the reflective unit, the The light emitted by the light-emitting surface of the photoelectric unit is reflected by the reflection unit and coupled into the planar light waveguide, and the light emitted by the planar light waveguide is reflected by the reflection unit and received by the light-receiving surface of the photoelectric unit. 2. The optical fiber coupling connector according to claim 1, wherein the ceramic substrate is a low temperature co-fired ceramic substrate. 3. The optical fiber coupling connector as claimed in claim 1, wherein the ceramic substrate is electrically connected to the circuit board through a ball grid array. 4. The optical fiber coupling connector according to any one of claims 1-3, wherein the circuit board is a printed circuit board or a flexible circuit board. 5. The optical fiber coupling connector according to claim 4, wherein the photoelectric unit comprises a light emitting diode and a photodiode. 6. A manufacturing method of an optical fiber coupling connector, the optical fiber coupling connector includes a photoelectric unit, a ceramic substrate and a circuit board, the circuit board has a planar optical waveguide, and the ceramic substrate and the circuit board are arranged There is a reflective unit and a lens, and the lens is arranged on the reflective unit. The manufacturing method of the optical fiber coupling connector includes the following steps: The photoelectric unit is arranged on the surface of the ceramic substrate by COB process; setting a ball grid array on the ceramic substrate; flipping the ceramic substrate so that the optoelectronic unit faces the planar optical waveguide on the circuit board; The ceramic substrate and the circuit board are connected by a ball grid array.