JPS61156871A - Planar photo printed board - Google Patents

Abstract

PURPOSE:To realize the titled board of high-density mounting by a method wherein a planar photo printed board provided with many electronic-photo circuit elements on the substrate is so constructed as to reduce the intersection of main signal wirings with control signal wirings in such a case. CONSTITUTION:Many electronic-photo circuit elements 2 are mounted on a dielectric or semiconductor substrate 1. These electronic-photo circuit elements are connected to one another with optical waveguides 3, 4 and electric wirings 5. Of these components, the optical waveguides 3 are for photo control signal propagation, and the optical waveguides 4 for photo main signal propagation; further, the electric wirings 5 for electric main signal propagation. In this case, only if consideration is made so that the electric wirings may not intersect with the optical waveguides, any way of intersection between the optical waveguides for control signal and main signal is not problem; accordingly, the location of each of wirings and optical waveguides is extremely facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a plurality of electronic and
The present invention relates to a flat optical printed board that uses optical control signals for optical circuit elements.

(Prior art and its problems) Composite optical printed circuit boards, in which light-emitting elements, light-receiving elements, optical waveguides, electronic circuits, etc. are mounted on dielectric substrates or semiconductor substrates, can run much faster than current electronic computers. Recently, the need for its development has been particularly emphasized as a key technology in constructing a light combination. Regarding this, in July 1984, J.D. Gutsudman (J.

W, Q06dm! n), etc., are the Optical Interconnection Co., Ltd.
He published a paper titled ``N for VLSI Systems'' on page 850 of Proceedings of IEFiE, in which he developed a planar and optical printed circuit board equipped with a composite of optical elements and electronic circuits. It is called optical interconnection in a broader sense, and the basic concept of its configuration is clarified. Figure 5, which describes how to apply control signals such as clock signals to various optical elements and electronic circuit elements provided on a flat optical printed board, is shown in the above-mentioned paper. In one example, a plurality of optical waveguides 52 are provided on a flat optical printed circuit board 51 made of a dielectric or a semiconductor, and a light control signal from a light source 53 is applied to the optical waveguides.

This optical control signal propagates through a 52-ft optical waveguide, and is distributed to each element by a directional coupler 54 provided along the way. Although FIG. 5 only shows the optical control signal, , in the case where a large number of electronic/optical circuit elements are installed on a flat optical printed circuit board and the main signal wiring and control signal wiring intersect with multiple IKs, what should be done is explained in detail. It has not been done.

(Objective of the Invention) The present invention aims to minimize the intersection of main signal wiring and control signal wiring in a flat optical printed circuit board in which a large number of electronic/optical circuit elements are provided on the board. The aim is to realize a planar optical printed circuit board with high-density packaging.

(Structure of the Invention) The structure of the present invention is that a plurality of electronic optical circuit elements are provided on a dielectric substrate or a semiconductor substrate, and these electronic optical circuit elements are connected to a main optical signal propagation device provided on the substrate. It is characterized in that it is connected by an optical waveguide, electrical wiring for electrical main signals, and an optical waveguide for propagating optical control signals.

In particular, with such a configuration, an optical control signal for controlling a plurality of electronic/optical circuit elements is received at at least one point provided on the substrate, and this optical control signal is transmitted from the receiving point to each of the points. If the optical control signal is distributed to each electronic/optical circuit element by an optical waveguide connected to the other electronic/optical circuit elements, the optical control signal will be transmitted to each electronic/optical circuit element at the same time, which will improve the controllability and processing capacity of each element. There are advantages.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of a flat optical printed board according to the present invention, in which a plurality of electron beams, nine in FIG. These electronic/optical circuit elements are mounted on optical waveguides 3 and 4.
Among the ports connected by electrical wiring 5, the optical waveguide 3 is for optical control signal propagation, the optical waveguide 4 is for optical main signal propagation, and the electrical wiring 5 is for electrical main signal. In this case, the main signal refers to the signal input to the electronic/optical circuit element that undergoes some conversion and is sent out again to the signal line, and the control signal refers to the signal input to the electronic/optical circuit element. , a signal used to control the operation of a light-receiving element or an electronic circuit, such as a black signal.Generally, this signal often disappears within the electronic/optical circuit element0. In this embodiment, the optical control signal is input from each point of the optical waveguide 3 for control signal propagation to the Y-branch optical waveguide to each electronic/optical circuit and element. In this case, the optical waveguide 3 for the control signal crosses the optical waveguide 4 for the optical main signal. Generally, when two optical waveguides intersect, if the intersection angle θ of the narrower one is approximately 10 degrees or more, the crosstalk between the light propagating through both waveguides and the mutually guided light is -40 dB.
On the other hand, when electrical wiring and optical waveguides intersect, mode conversion between TI and TM may occur on the optical waveguide where electrodes are present, and the light propagating through the optical waveguide may be lost due to the contact of the electrodes on the surface. However, there are many possibilities for various problems to occur. Therefore, if the control signal is an optical signal as in the embodiment shown in FIG. As long as you take care not to cross each other, it doesn't matter how the control signal and main signal optical waveguides intersect, making it extremely easy to set the position of each wiring and optical waveguide. are doing.

Contrary to the case in Figure 1, if electrical wiring is used for control signals as well, both the main signal and control signal optical waveguides will be
The position must be set so that it does not intersect with electrical wiring for both main and control signals, which is extremely difficult. 'Figure 2 is a diagram showing a specific example of each element used in the flat optical printed circuit board of the embodiment shown in Figure 1. Figure 2 (a) is an optical waveguide section;・In the optical circuit element part, the substrate 11 in the optical waveguide part shown in FIG.
t - For example, if it is 8i, an 8i01 layer 12 is formed on the Si surface, and Btus/Ge01 ft is formed on the 8i01 in it.
The optical waveguide section 13 is formed in a doped and buried manner.The electronic/optical circuit element section shown in FIG. FE
This is an example of a monolithic optical repeater that amplifies the signal with T, converts it into an optical signal again with a semiconductor laser, and outputs it. The optical input signal propagates through the optical waveguide 14, and the FBT 1 also serves as a photodetector.
6) This input light is input to 16c after being converted into an electrical signal.

3 FETs15. t6. The signal is amplified at 17 and applied to the semiconductor laser 18 . The signal converted back into light from the semiconductor laser is passed through the optical waveguide 19.

It is further transferred to the next electronic/optical circuit element section. At this time,
The control signal that clocks the signal is transmitted through the optical waveguide 20.
The optical control signal of the light is converted into an electrical signal by the photodetector 21 and F E T l'
5) is applied to the gate 15c. Also, the electrical signal is signal line 2
From 2.23, the source 15a of FET 15 and the FET
It is connected to the gate 17c of No. 17, etc., and is supplied to the descending electronic/optical circuit elements. In addition, 15a, 16a
, 17a is the source of each FET, 15b, 16
b, 17b indicates the drain.

In the embodiment shown in FIG. 1, the case where the optical main signal optical waveguide and the optical control signal optical waveguide intersect is described.
As shown in FIG. 3, it can be used in the same way even if either one is embedded in the substrate. That is, a part of the optical waveguide section 32t is embedded in the substrate 31 and lifted onto the surface at the electronic/optical circuit element 33 to input an optical signal into the element, while the other optical waveguide 34 is provided on the surface of the substrate. In fact, a more complex optical circuit configuration is possible by combining the flat part and the buried part. In addition, as a method of embedding an optical waveguide in a substrate, for example,
The 'rt+' layer with a slightly higher refractive index is diffused into the molten glass, and then by applying an electric field, this Tt layer is drawn into the glass and embedded. This can be easily achieved by diffusion.

FIG. 4 is a perspective view showing another embodiment of the flat optical printed circuit board according to the present invention, in which a substrate 41 made of a dielectric or a semiconductor
A plurality of electronic/optical circuit elements 42 are mounted on the top, and these elements are connected to an optical waveguide 43 for optical main signal propagation. They are connected by electrical main signal wiring 44. The optical waveguide 45 for optical control signal propagation is connected to the optical control signal generator 4 provided on the substrate.
In such a configuration, each electronic optical circuit element has a Y branch at each point so that the optical signal outputted from the electronic optical circuit element 6 is inputted to each electronic optical circuit element.

In this case, the optical waveguides for the main optical signal and the optical waveguide for optical control intersect, but in this case, the optical waveguides for the main optical signal and the optical waveguide for optical control intersect. When an optical control signal is output from one location and distributed to multiple locations using an all-optical waveguide, this crossover can occur particularly frequently. This problem can be easily solved by limiting it to .

(Effects of the Invention) The embodiments of the present invention have been described above. According to the present invention, a large number of electronic/optical circuit elements configured on a dielectric substrate or a semiconductor substrate can be connected to main signal lines and control signal lines. It has become extremely easy to design the wiring when connecting the wires, and therefore the feasibility has become much higher.Also, the signal processing speed is much faster than that of an electronic computer.

This makes it possible to realize optical combinations.1.In this embodiment, the case where the optical main signal waveguide and the optical control signal optical waveguide intersect is explained, but if the number of electronic/optical circuit elements is Of course, even if the number of elements is small and can be configured without intersecting each other, it is also included in the scope of this patent claim.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a flat optical printed board according to the present invention. 1 Substrate, 2 Electronic/Optical Circuit Element, 3 Optical Waveguide for Optical Control Signal, 4 Optical Main Signal Moonlight Waveguide, 5 Wiring for Electrical Signal Figure 2 is an embodiment of the flat/original printed board according to the present invention. Figure 2 (a) is a detailed diagram of each element used in the optical waveguide,
FIG. 2(b) shows an 〇118i substrate, 14. which is an electronic optical circuit element section. 19. 20 optical waveguide, 12 8i0x
Layer, 15, 16.17 FET transistor, 13
B+02+B! O@-Ge02.18 semiconductor laser, 22, 23 Electrical wiring FIG. 3 is a diagram showing an example of a buried optical waveguide that can be used in this embodiment. 31 Substrate, 33 Electronic optical circuit element 32° 34 Optical waveguide FIG. 4 is a perspective view showing another embodiment of the flat optical printed board according to the present invention. 41 Substrate, 42 Electronic optical circuit, 43 Optical waveguide for optical main signal, 44 Wiring for electric main signal, 45 Optical waveguide for original control signal, 46 Optical control signal generator. Figure 5 is a perspective view of a conventional flat optical printed circuit board. Illustrated. 51 Planar optical printed board, 52 Optical waveguide, ';1'l
Figure 1: Substrate 5: Electrical main signal wiring Figure 2 +1: Si substrate +4.19, 20: Optical waveguide 12: SiO2 layer +5.16.17: F
ET transistor 13: SiO>+8203・GeO2
18: Semiconductor laser 22. 23: 'Electrical wiring 73 Figure 31, substrate 32. 34: Optical waveguide 33: Electronic optical circuit element

Claims (1)

[Claims] A plurality of electronic optical circuit elements are provided on a dielectric substrate or a semiconductor substrate, and these electronic optical circuit elements are connected to each other by an optical waveguide for optical main signal propagation provided on the substrate, electrical wiring for electrical main signal, and optical A flat optical printed board characterized by being connected by an optical waveguide for control signal propagation.