KR20100117005A - A photoelectric conversion module - Google Patents

Abstract

PURPOSE: A photoelectric conversion module is provided to reduce an optical loss and improve optical coupling efficiency. CONSTITUTION: An integrated circuit substrate(110) is mounted on a printed circuit substrate. An optical waveguide array is formed on the integrated circuit. A first electrode pad and a second electrode pad are formed on one sidewall of the integrated circuit. An optical device array(120) includes a first electrode bump and a second electrode bump which are connected to the first and second electrode pads on one side opposite to the integrated circuit board. An optical device is installed in the center of the optical device array. A semiconductor chip(140) is mounted on the upper side of the integrated circuit board.

Description

Photoelectric Conversion Modules {A PHOTOELECTRIC CONVERSION MODULE}

The present invention relates to a photoelectric conversion module, and more particularly, to a photoelectric conversion module capable of improving optical coupling efficiency.

Recently, in the information communication technology, as the data to be transmitted becomes high speed and large in capacity, development of an optical communication technology for realizing a high speed communication environment is actively progressing. In optical communication, an electrical signal is converted into an optical signal by a photoelectric conversion element on a transmitting side, and the converted optical signal is transmitted to a receiving side using an optical fiber or an optical wave guide. The photoelectric conversion element on the receiving side converts the received optical signal back into an electrical signal. In order for such a photoelectric conversion element to be applied and commercialized in a system, an electrical connection and an optical coupling must be configured to be efficiently performed.

1 is a cross-sectional view showing an example of a photoelectric conversion module according to the prior art.

Referring to FIG. 1, a photoelectric conversion module according to the related art includes a transmitting side and a receiving side photoelectric conversion elements 10 and 20 disposed on a printed circuit board 30.

The transmission-side photoelectric conversion element 10 includes a first optical element 12 for emitting light to one side of the optical waveguide 32 formed in the printed circuit board 30, and a first optical element 12 for controlling the first optical element 12. A semiconductor chip 14 is included. The receiving side photoelectric conversion element 20 includes a second optical element 22 for receiving an optical signal transmitted through the optical waveguide 32 and a second semiconductor chip 24 for controlling the second optical element 22. Include.

The first and second optical devices 12 and 22 are bonded to the lower portions of the first and second semiconductor chips 14 and 24, respectively. In addition, the first and second optical devices 12 and 22 are disposed to correspond to the end portions of the optical waveguide 32, respectively.

The first and second semiconductor chips 14 and 24 are connected to the signal lines 34 formed on the upper surface of the printed circuit board 30 through the connection bumps 16 and 26, respectively, so that the first and second semiconductor chips 14 and 24 are electrically connected to the printed circuit board 30. Connected.

The driving characteristics of the photoelectric conversion module according to the related art having such a configuration will be described.

Under the control of the first semiconductor chip 14 of the transmission-side photoelectric conversion element 10, the first optical element 12 converts an electrical signal into an optical signal. The optical signal converted through the first optical element 12 is reflected through the first micromirror 32a formed at the transmitting end of the optical waveguide 32 and transmitted to the inside of the optical waveguide 32. The optical signal transmitted to the inside of the optical waveguide 32 is reflected by the second micromirror 32b formed at the receiving end of the optical waveguide 32 so that the second optical element of the receiving photoelectric conversion element 20 ( 22). The second optical device 22 receives an optical signal transmitted through the optical waveguide 32 and converts the optical signal into an electrical signal under the control of the second semiconductor chip 24.

As described above, in the photoelectric conversion module according to the related art, as the first and second optical devices 12 and 22 are spaced apart from each other in a direction perpendicular to the extended direction of the optical waveguide 32, the optical coupling efficiency is deteriorated. have. In general, the first optical device 12 uses a vertical cavity surface emitting laser (VCSEL), and the vertical resonance surface emitting laser has a divergence angle of about 25 to about when it emits light in the air. Since the distance is about 30 degrees, the optical coupling efficiency is greatly reduced as the distance from the optical waveguide 32 becomes longer.

In order to solve the problem that the optical coupling efficiency is reduced, in the photoelectric conversion module according to the related art, the lenses 36a and 36b are disposed between the first and second optical devices 12 and 22 and the optical waveguide 32. A method for improving the optical coupling efficiency by installing the device has been proposed. The lenses 36a and 36b may improve light coupling efficiency by preventing the spread of light emitted from the vertical resonance surface emitting laser. However, since the number of lenses 36a and 36b installed increases according to the separation distance between the first and second optical elements 12 and 22 and the optical waveguide 32, the lenses 36a and 36b are replaced with the first and second optical elements 12 and 22 and the optical waveguides 32 and 36b. An additional process is required for installing between the second optical elements 12 and 22 and the optical waveguide 32, respectively, which is a problem in the mass production.

Meanwhile, as described above, in the photoelectric conversion module according to the related art, light emitted from the first optical device 12 is formed by forming micromirrors 36a and 36b that are inclined at specific angles on both end surfaces of the optical waveguide 32, respectively. Is reflected to advance into the optical waveguide 32 and reflects the light transmitted through the optical waveguide 32 to the second optical element 22. However, the micro mirrors 36a and 36b are made of a metal thin film having a thickness of about several tens of microns, and the micromirrors 36a and 36b are formed to be inclined at a specific angle in the manufacturing process of the photoelectric conversion module or the optical axis is positioned at the correct position. In order to align with the multi-step process is required, there is a problem in that the reliability of the photoelectric conversion module is greatly reduced.

As described above, in the photoelectric conversion module according to the related art, the optical coupling efficiency decreases due to the separation distance in the vertical direction between the optical element and the optical waveguide, so that light is lost during light emission or light reception. In addition, the manufacturing process is complicated by micro mirrors and lenses, which are additionally formed or installed to solve the reduction in the optical coupling efficiency, and in addition, since elements such as micro mirrors are manufactured in a microminiature structure, the optical Not only is it difficult to match, but there is a problem that is easily broken during the manufacturing process. This can be seen that there is a problem that the burden of the process and production costs increases.

Accordingly, the present invention has been made to solve the above-described problem, and has the following objects.

First, an object of the present invention is to provide a photoelectric conversion module capable of aligning an optical element and an optical waveguide in a horizontal direction to improve optical coupling efficiency and thereby reducing optical loss.

Secondly, the present invention separates the electrical circuit elements and the optical circuit elements of the photoelectric conversion module independently from each other and disposed on the printed circuit board, through which it is possible to replace independently in the event of an electrical circuit element or optical circuit element failure repair is Another object is to provide a simple photoelectric conversion module.

Third, another object of the present invention is to provide a photoelectric conversion module capable of mass production by reducing the components of the photoelectric conversion module as compared with the prior art and reducing the manufacturing cost.

According to an aspect of the present invention, there is provided a printed circuit board, an optical waveguide array mounted on an upper portion of the printed circuit board and penetrating from one side to the other side, and having a first wall on one side thereof. And an integrated circuit board having second electrode pads formed thereon, and first and second electrode bumps respectively connected to the first and second electrode pads on one side wall facing the integrated circuit board, wherein an optical device Provided is a photoelectric conversion module including an optical device array and a semiconductor chip mounted on the integrated circuit board.

In addition, the present invention according to another aspect for achieving the above object is a printed circuit board, mounted on the printed circuit board, an optical waveguide array is formed therein, the first and second electrode pads on one side wall An integrated circuit board having third and fourth electrode pads formed on the other side wall, and first and second electrodes respectively connected to the first and second electrode pads at portions opposite to one side wall of the integrated circuit board. Third and fourth electrode bumps each having a bump and a first optical element array having a first optical element in a central portion thereof and connected to the third and fourth electrode pads respectively at a portion of the integrated circuit board facing the other side wall of the integrated circuit board. And a second optical device array having a second optical device installed at a central portion thereof, and first and second semiconductor chips mounted on the integrated circuit board, respectively.

In addition, the present invention according to another aspect for achieving the above object is a printed circuit board, an optical waveguide array is formed on the printed circuit board, penetrating from one side to the other side therein, one side wall A first integrated circuit board having first and second electrode pads formed thereon, and mounted on an upper portion of the printed circuit board, the optical waveguide array extending to be formed therein, and having third and fourth electrode pads formed on one side wall thereof. First and second electrode bumps, which are connected to the first and second electrode pads, respectively, are formed at a portion of the second integrated circuit board facing the one side wall of the first integrated circuit board. The first optical element array and the third and fourth electrode bumps respectively connected to the third and fourth electrode pads are formed at portions facing the second integrated circuit board and the one side wall, and the second photons Self-installed second It provides an element array, and a photoelectric conversion module including the first and second integrated circuit board mounted above each of the first and second semiconductor chips on.

In addition, the present invention according to another aspect for achieving the above object is a printed circuit board, an optical waveguide array is formed on the printed circuit board, penetrating from one side to the other side therein, one side wall A bare substrate having first and second electrode pads formed thereon, and first and second electrode bumps respectively connected to the first and second electrode pads on one side wall facing the bare substrate; Provided is a photoelectric conversion module including an optical element array and a semiconductor chip mounted on the printed circuit board.

According to the present invention, the following effects are obtained.

First, according to the present invention, the optical coupling efficiency is provided by installing an electrode pad on one side wall of the optical waveguide array and arranging the optical device to be automatically aligned in the horizontal direction and the direction in which light is transmitted in the optical waveguide array through the electrode pad. Can be improved to reduce light loss.

Second, according to the present invention, the optical device is arranged to be automatically aligned in the horizontal direction and the direction in which the light is transmitted in the optical waveguide array through electrode pads provided on one side wall of the optical waveguide array to achieve a tens of intervals between the optical element and the optical waveguide. It is possible to maintain within the μm to obtain an excellent optical coupling efficiency compared to the photoelectric conversion module according to the prior art.

Third, according to the present invention, the electrical circuit portion (semiconductor chip) and the optical circuit portion (optical waveguide array) of the photoelectric conversion module are physically separated from each other and disposed on the printed circuit board so that the electrical circuit portion or the optical circuit portion can be independently replaced. It is possible to provide a photoelectric conversion module that is easy to troubleshoot.

Fourth, according to the present invention, by arranging the optical elements in the optical waveguide array so that the light is aligned in the horizontal direction and the direction in which the light is transmitted, compared to the photoelectric conversion module according to the prior art, components such as micromirrors and lenses are not required. The number of contrast components can be reduced, which allows for mass production of the module and reduces manufacturing costs.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. In addition, in the drawings, the thickness, width, size, etc. of each component are exaggerated for convenience of description. In addition, when described as 'connected bumps' or 'electrode bumps' throughout the specification, they may be interpreted to include conventional solder balls, respectively. In addition, the same reference numerals denote the same elements throughout the specification.

Example 1

2 is a cross-sectional view illustrating a photoelectric conversion module according to Embodiment 1 of the present invention.

2, the photoelectric conversion module according to the first embodiment of the present invention is a printed circuit board 100, an integrated circuit board mounted on the printed circuit board 100 and formed with an optical waveguide array 111 therein ( IC substrate) 110, a semiconductor chip 140 mounted on the integrated circuit board 110, and an optical element array 120 horizontally aligned with the optical waveguide array 111.

The integrated circuit board 110 may be electrically connected to the printed circuit board 100 by a flip chip bonding method through the first connection bump 101. An optical waveguide array 111 for transmitting an optical signal provided from the optical device array 120 is formed in the integrated circuit board 110.

3 is a view illustrating the optical coupling structure according to the present invention in more detail. FIG. 3 is a perspective view illustrating the integrated circuit board 110 and the optical device array 120.

Referring to FIG. 3, first and second electrode pads 114a and 114b are disposed on one side wall of the integrated circuit board 110 facing the optical device array 120 at upper and lower sides of the optical waveguide array 111. Is formed. In addition, a signal line 129 is formed on the integrated circuit board 110 to transmit an electrical signal from the semiconductor chip 140 or to the semiconductor chip 140. The signal line 129 is integrally formed with the first electrode pad 114a or electrically connected thereto. The second electrode pad 114b is connected to a ground line (not shown) in the integrated circuit board 110.

The optical device array 120 is connected to the first electrode bump 121a connected to the first electrode pad 114a of the integrated circuit board 110 and the second electrode pad 114b of the integrated circuit board 110. The second electrode bump 121b and an optical element (light emitting unit or light receiving unit) 122 that are optically connected to the optical waveguide array 111 are included.

In fabricating the integrated circuit board 110, the optical device array 120 is provided with a predetermined standard, and thus the first and second electrode pads 114a and 114b and the optical waveguide array 111 are integrated into the integrated circuit board ( When formed in the 110, the first and second electrode bumps 121a and 121b and the first and second electrode bumps 121a and 121b formed in the optical element array 120 are formed to correspond to the specifications and positions of the optical element 122. By forming the two electrode pads 114a and 114b and the optical waveguide array 111, the optical coupling between the optical waveguide array 111 and the optical element 122 can be efficiently achieved relatively easily.

4 is a view as viewed from the side after connecting the optical element array 120 to the integrated circuit board 110.

As shown in FIG. 4, the first and second electrode pads 114a and 114b of the integrated circuit board 110 are formed to correspond to the first and second electrode bumps 121a and 121b of the optical device array 120. The optical waveguide array 111 is formed to correspond to the optical device 122. Accordingly, the optical coupling between the optical waveguide array 111 and the optical device 122 may be achieved by simply connecting the integrated circuit board 110 and the optical device array 120 in the arrow direction B as shown in FIG. 3. Can be achieved efficiently.

In addition, the size of the first and second electrode pads 114a and 114b formed on one side wall of the integrated circuit board 110 is larger than that of the first and second electrode bumps 121a and 121b of the optical device array 120. It is preferable to form. Through this, the position adjustment of the optical element array 120 can be performed within a predetermined range, thereby ensuring a position matching margin between the optical waveguide array 111 and the optical element 112. In addition, various metals such as copper (Cu), aluminum (Al), and gold (Au) may be used for the first and second electrode pads 114a and 114b. In addition, the first and second electrode pads 114a and 114b may be made of various materials such as nickel (Ni), gold (Au), tin (Sn), silver (Ag), etc. to improve bonding performance with the optical device array 120. A plated film of material may be coated.

In FIG. 2, the integrated circuit board 110 is electrically connected to an upper portion of the printed circuit board 100 by a flip chip bonding method through the first connection bumps 101. The integrated circuit board 110 is used as an intermediate medium that allows the semiconductor chip 140 to be electrically connected to the printed circuit board 100 easily.

The semiconductor chip 140 has a large number of electrodes and an electrode spacing of only several tens of micrometers, so that the structure of the printed circuit board 100 may be complicated and the cost may increase significantly in order to directly bond the same to the printed circuit board 100. Can be. Accordingly, the semiconductor chip 140 is not directly mounted on the printed circuit board 100, but is mounted on the integrated circuit board 110, thereby allowing the integrated circuit between the semiconductor chip 140 and the printed circuit board 100. The substrate 110 is used as an electrical connection medium to electrically connect the semiconductor chip 140 and the printed circuit board 100.

As such, the semiconductor chip 140 having the driving circuit for driving the optical device array 120 is mounted on the integrated circuit board 110. The semiconductor chip 140 is electrically connected to the integrated circuit board 110 through the second connection bump 141 and the signal line 129. In addition, a resin-based material may be filled between the semiconductor chip 140 and the integrated circuit board 110 to alleviate thermal stress between the integrated circuit board 110 and the semiconductor chip 140.

In addition, although not shown, a predetermined gap between the printed circuit board 100 and the integrated circuit board 110 may be used to relieve stress caused by a difference in thermal expansion coefficient between elements (parts) when the external temperature changes. May be filled with a resin-based material.

In addition, a light transmissive epoxy may be filled between the integrated circuit board 110 and the optical device array 120 to increase optical coupling efficiency. As the light transmissive epoxy, it is preferable to use a polymer-based epoxy having a refractive index similar to that of the optical waveguide array 111 and having good light transmittance at the wavelength of use of the optical element array 120. For example, the light transmissive epoxy has a refractive index of 1.4 to 1.6, it is preferable that the epoxy having a light transmittance of 80 to 95% at the wavelength of the light emitted from the optical element array 120.

On the other hand, optical coupling between the optical element array 120 and the optical waveguide array 111 is not necessarily made of a light-transmissive epoxy, it is conventional to use an auxiliary sleeve or the like within the range that the optical coupling efficiency is not significantly reduced. It may be coupled by a packaging technique.

2 and 3, the optical device array 120 includes any one selected from the group consisting of a vertical cavity surface emitting laser (VCSEL), a light emitting diode (LED), and a photo diode. Optical elements can be used.

In addition, the optical waveguide array 111 is preferably formed of a silica optical waveguide or a polymer optical waveguide. However, the present invention is not limited to these materials and may be formed of any material as long as it is a transparent material such as glass in addition to silica and polymer.

Driving characteristics of the photoelectric conversion module according to Embodiment 1 of the present invention having such a structure are as follows.

First, the signal transmitted through the electrical wiring 105 formed in the printed circuit board 100 is transmitted to the driving circuit of the semiconductor chip 140 via the integrated circuit board 110. The electrical signal of the driving circuit is transmitted to the optical device 122 of the optical device array 120 through the second connection bump 141 and the signal line 129. The optical device 122 (in the case of a light emitting device) converts an input electrical signal into an optical signal and transmits the optical signal to the optical waveguide array 111, and the optical signal transmitted to the optical waveguide array 111 is an optical waveguide array 111. Along the direction of the arrow shown in FIG. 2.

Example 2

5 is a cross-sectional view illustrating a photoelectric conversion module according to a second exemplary embodiment of the present invention.

Referring to FIG. 5, in the photoelectric conversion module according to the second exemplary embodiment of the present invention, the first optical device array 220a and the second optical device array 220b are connected to both sides of the integrated circuit board 210. Has a structure similar to the photoelectric conversion module according to Embodiment 1 of the present invention shown in FIG.

In the photoelectric conversion module according to the second exemplary embodiment of the present invention, the integrated circuit board 210 is bonded to the upper portion of the printed circuit board 200 by a flip chip bonding method through the first connection bump 201. Signal lines 229 are formed on the integrated circuit board 210 to transmit electrical signals from the first and second semiconductor chips 240a and 240b, and signal lines are formed on the upper side of the integrated circuit board 210. First electrode pads 214a connected to 229 are formed. In addition, an optical waveguide array 211 is formed inside the integrated circuit board 210. In addition, a second electrode pad 214b connected to a ground line formed in the integrated circuit board 210 is formed on a lower surface of the integrated circuit board 210.

The first optical device array 220a is connected to the first electrode bump 221a connected to the first electrode pad 214a of the integrated circuit board 210 and the second electrode pad 214b of the integrated circuit board 210. A second electrode bump 221b to be connected and an optical waveguide array 211 (or a single optical waveguide) formed therein through the integrated circuit board 210 and a light emitting part 222a optically connected in a horizontal direction. do.

The second optical device array 220b is connected to the third electrode bump 221c connected to the third electrode pad 214c of the integrated circuit board 210 and the fourth electrode pad 214d of the integrated circuit board 210. A fourth electrode bump 221d connected thereto, and an optical waveguide array 211 (or a single optical waveguide) optically connected to the optical waveguide array 211 (or a single optical waveguide) formed therein through the integrated circuit board 210. .

In the photoelectric conversion module according to the second exemplary embodiment of the present invention, since the first and second optical device arrays 220a and 220b are provided in the same predetermined size, the first to fourth electrode pads are formed on the integrated circuit board 210. When the optical waveguide array 211 and the optical waveguide array 211 are formed, the first to fourth electrode bumps 221a to 221d formed on the first and second optical element arrays 220a and 220b, the light emitting unit 222a, The first to fourth electrode pads 214a to 214d and the optical waveguide array 211 should be formed on the integrated circuit board 210 to correspond to the size and position of the light receiving unit 222b.

The first to fourth electrode pads 214a to 214d and the optical waveguide array 211 may include the first to fourth electrode bumps 221a to 221d of the first and second optical device arrays 220a and 220b and the light emitting unit ( 222a and the first to fourth electrode pads 214a to 214d and the first to fourth electrode bumps 221a to 221d of the integrated circuit board 210 as formed in accordance with the size and position of the light receiving unit 222b. The optical coupling between the optical waveguide array 211, the light emitting portion 222a, and the light receiving portion 222b can be efficiently achieved only by connecting the.

Driving characteristics of the photoelectric conversion module according to the second embodiment of the present invention having such a structure are as follows.

First, the electrical signal in the large-scale integration (LSI) 280 is transmitted to the first semiconductor chip 240a through the signal line 229 of the integrated circuit board 210. The first semiconductor chip 240a generates a new electrical signal in response to the input electrical signal and transmits the new electrical signal to the first optical device array 220a. The light emitting unit 222a of the first optical device array 220a converts an electrical signal into an optical signal and transmits the electrical signal in the arrow direction A through the optical waveguide array 211. The optical signal transmitted from the first optical element array 220a through the optical waveguide array 211 is received by the light receiving unit 222b of the second optical element array 220b disposed opposite the first optical element array 220a. Is sent to. The light receiving unit 222b of the second optical device array 220b converts the received optical signal into an electrical signal and transmits the converted optical signal to the second semiconductor chip 240b through the signal line 229, and the second semiconductor chip 240b The amplified electric signal is transmitted to the large-scale integrated circuit 280.

Example 3

6 is a cross-sectional view illustrating a photoelectric conversion module according to a third exemplary embodiment of the present invention.

Referring to FIG. 6, in the photoelectric conversion module according to the third exemplary embodiment of the present invention, first and second integrated circuit boards 310a and 310b are mounted on the printed circuit board 300, respectively. Except that the first and second optical device arrays 320a and 320b are mounted on the side surfaces of the second integrated circuit boards 310a and 310b, the structure is similar to that of the photoelectric conversion module according to the second embodiment of the present invention.

As illustrated in FIG. 6, the first and second integrated circuit boards 310a and 310b are spaced apart from each other on the printed circuit board 300, and the first integrated circuit board 310a and the second integrated circuit board 310b are disposed on the printed circuit board 300. Are formed therein and connected to each other through an extended optical waveguide array 311.

In the first integrated circuit board 310a, a first signal line 329a for transmitting an electrical signal of the first semiconductor chip 340a is formed on the first integrated circuit board 310a, and the first integrated circuit board 310a is formed. The first electrode pad 314a connected to the first signal line 329a is formed on the upper surface of the circuit board 310a. In addition, an optical waveguide array 311 is formed in the first integrated circuit board 310a. The optical waveguide array 311 extends into the second integrated circuit board 310b. Further, although not shown, a second electrode pad 314b connected to a ground line formed in the first integrated circuit board 310a is formed on the lower surface of the first integrated circuit board 310a.

In the second integrated circuit board 310b, the second integrated circuit board 310b includes the second signal line 329b, the third electrode pad 314c, and the same as the first integrated circuit board 310a described above. The fourth electrode pad 314d is formed. The second signal line 329b is formed on the second integrated circuit board 310b, and the third and fourth electrode pads 314c and 314d are formed on one side wall of the second integrated circuit board 310b.

The first optical device array 320a is disposed on the side of the first integrated circuit board 310a. One side wall of the first optical device array 320a may include first and second electrode bumps 321a and 321b connected to the first and second electrode pads 314a and 314b of the first integrated circuit board 310a, respectively. Is formed. In the first optical element array 320a, a light emitting part 322a connected to the optical waveguide array 311 is formed.

The second optical device array 320b is disposed on the side of the second integrated circuit board 310b. One side wall of the second optical device array 320b includes third and fourth electrode bumps 321c and 321d connected to the third and fourth electrode pads 314c and 314d of the second integrated circuit board 310b, respectively. Is formed. In addition, a light receiving unit 322b connected to the optical waveguide array 311 is formed in the second optical device array 320b.

In the photoelectric conversion module according to the third exemplary embodiment of the present invention, the first and second optical device arrays 320a and 320b are provided with the same predetermined standard. Therefore, the first to fourth electrode pads 314a to 314d and the optical waveguide array 311 to the first and second integrated circuit boards 310a and 310b are disposed on the first and second optical element arrays 320a and 320b. The first to fourth electrode bumps 321a to 321d, the light emitter 322a, and the light receiver 322b are formed to correspond to the specifications and positions of the first to fourth electrode bumps 321a to 321d. Accordingly, only the operation of connecting the first to fourth electrode bumps 321a to 321d to the first to fourth electrode pads 314a to 314d causes the optical waveguide array 311 to be connected to the light emitting portion 322a and the light receiving portion 322b. It is possible to connect stably, through which optical coupling is efficiently achieved.

The driving characteristics of the photoelectric conversion module according to Embodiment 3 of the present invention having such a structure are as follows.

First, the electrical signal output from the first large-scale integrated circuit 380a is transmitted to the first semiconductor chip 340a through the first connection bump 341a and the first signal line 329a. The first semiconductor chip 340a generates a new electrical signal in response to the input electrical signal, and the generated electrical signal is the second connection bump 341b, the first signal line 329a, and the first electrode pad 314a. And the first electrode bump 321a are transmitted to the light emitting unit 322a of the first optical device array 320a. The light emitter 322a converts an input electrical signal into an optical signal and provides the optical waveguide array 311.

The optical signal provided from the light emitting unit 322a to the optical waveguide array 311 is transmitted to the light receiving unit 322b of the second optical element array 320b in the arrow direction A. FIG. The light receiving unit 322b converts the transmitted optical signal into an electrical signal, and thus, receives the first light through the third electrode bump 321c, the fourth electrode pad 314c, the second signal line 329b, and the third connection bump 341c. Transferred to the semiconductor chip 340b. The first semiconductor chip 340b amplifies the input electric signal and transmits the electrical signal to the second large-scale integrated circuit 380b through the third connection bump 341c, the second signal line 329b, and the fourth connection bump 341d. do.

Example 4

7 is a cross-sectional view illustrating a photoelectric conversion module according to a fourth exemplary embodiment of the present invention.

Referring to FIG. 7, the photoelectric conversion module according to the fourth embodiment of the present invention is similar to the first to third embodiments in the structure and method of aligning the optical element array and the optical waveguide array. However, in the photoelectric conversion module according to the fourth embodiment of the present invention, as in the first to third embodiments, the optical waveguide array is not formed in the integrated circuit board but in the bare substrate in which the integrated circuit is not formed. Have different structures.

As shown in FIG. 7, the photoelectric conversion module according to the fourth exemplary embodiment of the present invention includes a bare substrate 410 mounted on the printed circuit board 400 and an optical waveguide array 411 formed in the bare substrate 410. The optical element array 420 optically connected to the transmission direction and the horizontal direction, and the semiconductor chip 440 mounted on the printed circuit board 400 in the horizontal direction and the bare substrate 410.

As described above, in the photoelectric conversion module according to the fourth embodiment of the present invention, the optical waveguide array is implemented in the bare substrate instead of the integrated circuit board. The reason is that the optical waveguide is formed in the state in which various types of integrated circuits are formed, such as an integrated circuit board. This is because forming an array follows a lot of constraints on the process. Therefore, in Embodiment 4 of the present invention, the optical waveguide array 411 may be implemented in the bare substrate 410 instead of the integrated circuit board, thereby simplifying the process.

The bare substrate 410 and the semiconductor chip 440 are mounted on the printed circuit board 400 by flip chip bonding. The semiconductor chip 440 is connected to the first signal line 402 formed on the printed circuit board 400 through the first connection bump 401a. The second signal line 429 formed under the bare substrate 410 is connected to the first signal line 402 through the second connection bump 401b.

The bare substrate 410 is a pure substrate without an integrated circuit, and is formed of a material having dielectric properties. For example, the semiconductor material may be formed of a semiconductor material that is not doped with cinnamic impurities. An optical waveguide array 411 is formed in the bare substrate 410, and first and second electrode pads 414a and 414b are formed on one side wall of the bare substrate 410, respectively.

The optical waveguide array 411 is preferably formed of a silica optical waveguide or a polymer optical waveguide. However, embodiments of the present invention are not limited thereto, and may be formed of any material as long as it is a transparent material such as glass capable of transmitting light with a predetermined refractive index. In addition, the shape of the cross section of the optical waveguide is not limited to the quadrangle, and various forms including a circular shape are possible.

The optical device array 420 is connected to the first and second electrode pads 414a and 414b of the bare substrate 410 through the first and second electrode bumps 401c, respectively. The optical device array 420 includes an optical device (light emitting unit or light receiving unit) 412 optically connected to the optical waveguide array 411 in a horizontal direction.

Driving characteristics of the photoelectric conversion module according to the fourth exemplary embodiment of the present invention shown in FIG. 7 will be described.

First, the electrical signal output from the semiconductor chip 440 having the driving circuit for driving the optical element array 420 is first signal line (above the printed circuit board 400 through the first connection bump 401a). 402). The electrical signal transmitted to the first signal line 402 is transmitted to the second signal line 429 of the bare substrate 410 through the second connection bump 401b. The electrical signal transmitted to the second signal line 429 is transmitted to the optical device array 420 via the second electrode pad 414b and the second electrode bump 401c. The optical element array 420 converts an input electrical signal into an optical signal and emits light through the optical element 412 (in the case of the light emitting unit). The optical signal emitted through the optical element 412 is transmitted in the direction of the arrow through the optical waveguide array 411.

Example 5

8 is a cross-sectional view illustrating a photoelectric conversion module according to a fifth exemplary embodiment of the present invention.

Referring to FIG. 8, the photoelectric conversion module according to the fifth exemplary embodiment of the present invention is disposed on the printed circuit board 500 by separating an electric circuit device and an optical circuit device independently from each other like the photoelectric conversion module according to the fourth embodiment. do. However, the fifth embodiment has a structure different from that of the fourth embodiment in the connection structure for electrically connecting the electric circuit element and the optical circuit element.

8, in the photoelectric conversion module according to the fifth embodiment of the present invention, the semiconductor chip and the bare substrate are not mounted on the printed circuit board by the bonding method using the connection bumps as in the fourth embodiment, and the semiconductor chip 540 The bare substrate 510 is directly mounted on the printed circuit board 500.

An optical waveguide array 511 is formed in the bare substrate 510, and first and second electrode pads 514a and 514b, which are vertically separated from the optical waveguide array 511, are formed on one side wall.

The optical device array 520 is connected to the bare substrate 510 through the first and second electrode bumps 519. The first and second electrode bumps 519 are connected to the first and second electrode pads 514a and 514b respectively formed on one side wall of the bare substrate 510. The optical device 522 of the optical device array 520 is automatically connected to the optical waveguide array 511 by connecting the first and second electrode bumps 519 with the first and second electrode pads 514a and 514b. .

The first signal line 542 is formed on the semiconductor chip 540, and the first signal line 542 is bonded to the wire 518 with the second signal line 529 formed on the bare substrate 510.

Driving characteristics of the photoelectric conversion module according to Embodiment 5 of the present invention shown in FIG. 8 will be described.

The electrical signal output from the semiconductor chip 540 having the driving circuit for driving the optical element array 520 is transmitted to the first signal line 542 and the electrical signal transmitted through the first signal line 542. Is transmitted to the second signal line 529 of the bare substrate 510 through the wire 518. The electrical signal transmitted to the second signal line 529 is transmitted to the optical device array 520 via the second electrode pad 514b and the second electrode bump 519. The optical element 522 (in the case of the light emitting unit) converts an input electric signal into an optical signal to emit light. The optical signal emitted from the optical device 522 is transmitted in the direction of the arrow through the optical waveguide array 511 of the bare substrate 510.

Example 6

9 is a cross-sectional view illustrating a photoelectric conversion module according to a sixth embodiment of the present invention.

Referring to FIG. 9, the photoelectric conversion module according to the sixth embodiment of the present invention is disposed on the printed circuit board 600 by separating the electric circuit device and the optical circuit device independently from each other like the photoelectric conversion module according to the fourth embodiment. do. However, in the sixth embodiment, unlike the fourth embodiment, the semiconductor chip 640 is not mounted on the printed circuit board 600 by the flip chip bonding method, but is integrated by the flip chip bonding method on the printed circuit board 600. The circuit board 630 is mounted on the top.

As described above, according to the sixth embodiment of the present invention, the semiconductor chip 640 is not directly mounted on the printed circuit board 600, unlike the fourth embodiment, but the integrated circuit board 630 mounted on the printed circuit board 600. It has a structure mounted on the top. The reason for this is that when the driving circuit configured in the semiconductor chip 640 has a high speed action, it is advantageous to mount it on the integrated circuit board 630 instead of directly mounting it on the printed circuit board 600 in view of economy.

In addition, in the sixth embodiment of the present invention, the integrated circuit board 630 is electrically connected to the upper portion of the printed circuit board 600 by a flip chip bonding method through the first connection bump 601a. The integrated circuit board 630 is used as an intermediate medium that allows the semiconductor chip 640 to be electrically connected to the printed circuit board 600 easily. That is, the semiconductor chip 640 has a large number of electrodes and an electrode spacing of only a few tens of micrometers, so that the structure of the printed circuit board 600 is complicated and costs are greatly increased if the semiconductor chip 640 is directly bonded to the printed circuit board 600. To prevent this, the semiconductor chip 640 and the printed circuit board 600 are electrically connected by using the integrated circuit board 630 as an electrical connection medium between the semiconductor chip 640 and the printed circuit board 600.

The bare substrate 610 is mounted on the printed circuit board 600 by flip chip bonding. The bare substrate 610 is a pure substrate without an integrated circuit, and is formed of a material having dielectric properties. An optical waveguide array 611 is formed in the bare substrate 610, and first and second electrode pads 614a and 614b are formed on one side of the bare substrate 610 with respect to the optical waveguide array 611. In addition, a second signal line 629 connected to the second electrode pad 614b is formed under the bare substrate 610.

The optical device array 620 is connected to the first and second electrode pads 614a and 614b of the bare substrate 610 through the first and second electrode bumps 619, respectively. The optical element array 620 includes an optical element (light emitting unit or light receiving unit) 622 optically connected to the optical waveguide array 611 in a horizontal direction.

Driving characteristics of the photoelectric conversion module according to Embodiment 6 of the present invention shown in FIG. 9 will be described.

First, the electrical signal output from the semiconductor chip 640 having the driving circuit for driving the optical device array 610 is transmitted to the integrated circuit board 630 through the third connection bump 617. The electrical signal transmitted to the integrated circuit board 630 is transmitted to the first signal line 602 through the first connection bump 601a, and the electrical signal transmitted to the first signal line 602 is transmitted to the second connection bump ( It is transmitted to the second signal line 629 of the bare substrate 610 through 601b. The electrical signal transmitted to the second signal line 629 is transmitted to the optical device array 620 through the second electrode pad 614b and the second electrode bump 619. The optical element array 620 converts an input electrical signal into an optical signal and emits light through the optical element 622. Light emitted from the optical device 622 is transmitted through the optical waveguide array 611 of the bare substrate 610 disposed adjacently.

Example 7

10 is a cross-sectional view illustrating a photoelectric conversion module according to a seventh embodiment of the present invention.

Referring to FIG. 10, the photoelectric conversion module according to the seventh embodiment of the present invention is disposed on the printed circuit board 700 by separating the electric circuit device and the optical circuit device independently from each other like the photoelectric conversion module according to the fourth embodiment. do. However, in the seventh embodiment, unlike the fourth embodiment, the bare substrate 710 is connected to the first signal line 702 formed on the printed circuit board 700 through the connection pin 701b.

Pin holes (not shown) may be formed in an array form on the printed circuit board 710 so that the connection pins 701b may be inserted and fastened. In this case, the pin hole is formed of a conductive material, and the connection pin 701b is electrically connected to the connection pin 701b during insertion and fastening. In addition, the pin hole fixes the connection pin 701b at a constant pressure when the connection pin 701b is inserted.

The connection pin 701b is also electrically connected to the first signal line 702 formed on the printed circuit board 710. A through hole may be formed in the first signal line 702 to allow the connection pin 701b to pass therethrough. The connection pin 701b is inserted into the pin hole of the printed circuit board 700 through the through hole of the first signal line 702.

Since the configuration other than the connecting pin 701b and the pin hole has the same configuration as that of the fourth embodiment, a detailed description thereof will be replaced with the contents described in the fourth embodiment of the present invention.

As described above, in the seventh embodiment of the present invention, unlike the fourth embodiment, the bare board 710 is connected to the first signal line 702 formed on the printed circuit board 700 through the connecting pin 701b. have. The reason is to improve the detachability from the printed circuit board 700 when the bare substrate 710 is defective. That is, when the bare board 710 is defective by easily connecting the bare board 710 with the printed circuit board 700 through the first signal line 702 by using a relatively easy connection pin 701b. It can be removed from 700 and replaced.

Driving characteristics of the photoelectric conversion module according to the seventh exemplary embodiment of the present invention shown in FIG. 10 will be described.

First, the electrical signal output from the semiconductor chip 740 having the driving circuit for driving the optical device array 720 is first signal line 702 on the printed circuit board 700 through the connection bump 701a. Is sent to. The electrical signal transmitted to the first signal line 702 is transmitted to the second signal line 729 of the bare substrate 710 through the connecting pin 701b. The electrical signal transmitted to the second signal line 729 is transmitted to the optical device array 720 via the second electrode pad 714b and the second electrode bump 701c. The optical element array 720 converts an input electrical signal into an optical signal and emits light through the optical element 712 (in the case of the light emitting unit). The optical signal emitted through the optical element 722 is transmitted in the direction of the arrow through the optical waveguide array 711.

As described above, according to the present invention, the optical coupling between the optical waveguide array and the optical element can be easily achieved by simply connecting the electrode pads formed on the optical waveguide array side and the electrode bumps formed on the optical element array side. The transfer of high-speed, large-capacity electrical signals between large-scale integrated circuits on a circuit board can be easily and quickly made by the optical element array and the optical waveguide array. In addition, in the present invention, as the optical device is directly coupled to the optical waveguide array, the distance between the optical device and the optical waveguide array can be maintained within several tens of μm, thereby obtaining an excellent optical coupling efficiency as compared with the conventional photoelectric conversion module.

As described above, although the technical spirit of the present invention has been described in detail in the preferred embodiments, it should be noted that the above-described embodiments are for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

1 is a cross-sectional view showing a photoelectric conversion module according to the prior art.

2 is a cross-sectional view showing a photoelectric conversion module according to Embodiment 1 of the present invention.

3 is a perspective view illustrating an integrated circuit board 110 and an optical device array 120 shown in FIG. 2.

4 is a view as viewed from the side after connecting the optical element array 120 to the integrated circuit board 110 shown in FIG.

5 is a sectional view showing a photoelectric conversion module according to a second embodiment of the present invention.

6 is a sectional view showing a photoelectric conversion module according to a third embodiment of the present invention.

7 is a sectional view showing a photoelectric conversion module according to a fourth embodiment of the present invention.

8 is a sectional view showing a photoelectric conversion module according to a fifth embodiment of the present invention.

9 is a sectional view showing a photoelectric conversion module according to a sixth embodiment of the present invention;

10 is a sectional view showing a photoelectric conversion module according to a seventh embodiment of the present invention;

<Explanation of symbols for the main parts of the drawings>

120, 220a, 220b, 320a, 320b 420, 520, 620, 720: optical element array

110, 210, 310a, 310b, 630: integrated circuit board

410, 510, 610, 710: bare board

111, 211, 311, 411, 511, 611, 711: optical waveguide array

100, 200, 300, 400, 500, 600, 700: printed circuit board

140, 240a, 240b, 340a, 340b, 440, 540, 640, 740: semiconductor chip

129, 229, 329a, 329b, 402, 429, 542, 529, 602, 629, 702, 729: signal line

122, 222a, 222b, 322a, 322b, 422, 522, 622, 712: optical element

114a, 114b, 214a, 214b, 214c, 214d, 314a, 341b, 314c, 314d, 414a, 414b, 514a, 514b, 614a, 614b, 714a, 714b: electrode pad

 121a, 121b, 221a, 221b, 221c, 221d, 321a, 321b, 321c, 321d, 401c, 519, 619, 701c: electrode bump

101, 141, 201, 241, 301a, 301b, 341a, 341b, 341c, 341d, 401a, 401b, 601a, 601b, 701a: connection bump

701b: connecting pin

Claims (30)

Printed circuit board; An integrated circuit board mounted on an upper portion of the printed circuit board and having an optical waveguide array penetrating from one side portion to the other side, and having first and second electrode pads formed on one side wall; An optical element array having first and second electrode bumps connected to the first and second electrode pads, respectively, on one side wall facing the integrated circuit board, and having an optical element in a central portion thereof; And A semiconductor chip mounted on the integrated circuit board Photoelectric conversion module comprising a. The method of claim 1, The first and second electrode pad is a photoelectric conversion module, the position is formed so that the optical coupling is generated between the optical waveguide array and the optical element when connected to the first and second electrode bumps. The method of claim 1, The first and second electrode pads have a larger size than the first and second electrode bumps. The method of claim 1, A photoelectric conversion module filled with a transparent epoxy resin between the integrated circuit board and the optical device array. The method of claim 1, The optical device is any one selected from a vertical cavity surface emitting laser (VCSEL), a light emitting diode (LED) or a photo diode. The method of claim 1, A first connection bump connecting the integrated circuit board and the printed circuit board; A signal line formed on the integrated circuit board and connected to the first electrode pad; And A second connection bump connecting the semiconductor chip and the signal line Photoelectric conversion module further comprising. Printed circuit board; An integrated circuit board mounted on the printed circuit board, an optical waveguide array formed therein, first and second electrode pads formed on one side wall, and third and fourth electrode pads formed on the other side wall; A first optical element array having first and second electrode bumps connected to the first and second electrode pads, respectively, at a portion of the integrated circuit board facing one side wall; A second optical element array having third and fourth electrode bumps connected to the third and fourth electrode pads, respectively, on a portion of the integrated circuit board facing the other side wall, and having a second optical element in a central portion thereof; And First and second semiconductor chips mounted on the integrated circuit board, respectively Photoelectric conversion module comprising a. The method of claim 7, wherein And the first and second electrode pads are configured to determine positions at which optical coupling is generated between the optical waveguide array and the first optical element when the first and second electrode pads are connected to the first and second electrode bumps. The method of claim 7, wherein And the third and fourth electrode pads are configured to determine positions at which optical coupling occurs between the optical waveguide array and the second optical element when the third and fourth electrode pads are connected to the third and fourth electrode bumps. The method of claim 7, wherein The first and second electrode pads are formed to have a larger size than the first and second electrode bumps, and the third and fourth electrode pads are formed to be larger than the third and fourth electrode bumps. The method of claim 7, wherein And a light transmissive epoxy resin filled between the integrated circuit board and the first optical device array and between the integrated circuit board and the second optical device array. The method of claim 7, wherein Each of the first and second optical devices is any one selected from a vertical cavity surface emitting laser (VCSEL), a light emitting diode (LED), and a photo diode. The method of claim 7, wherein A first connection bump connecting the integrated circuit board and the printed circuit board; A signal line formed on the integrated circuit board and connected to the first and third electrode pads; And Second connection bumps connecting the first and second semiconductor chips to the signal line, respectively; Photoelectric conversion module further comprising. Printed circuit board; A first integrated circuit board mounted on the printed circuit board and having an optical waveguide array formed therein and penetrating from one side to the other, and having first and second electrode pads formed at one side wall; A second integrated circuit board mounted on the printed circuit board, the optical waveguide array extending to be formed therein, and having third and fourth electrode pads formed on one side wall; A first optical element array having first and second electrode bumps connected to the first and second electrode pads, respectively, on a portion of the first integrated circuit board facing the side wall; A second optical element array having third and fourth electrode bumps connected to the third and fourth electrode pads, respectively, at a portion of the second integrated circuit board facing one side wall, and having a second optical element at a central portion thereof; And First and second semiconductor chips mounted on the first and second integrated circuit boards, respectively. Photoelectric conversion module comprising a. The method of claim 14, And the first and second electrode pads are configured to determine positions at which optical coupling is generated between the optical waveguide array and the first optical element when the first and second electrode pads are connected to the first and second electrode bumps. The method of claim 14, And the third and fourth electrode pads are configured to determine positions at which optical coupling occurs between the optical waveguide array and the second optical element when the third and fourth electrode pads are connected to the third and fourth electrode bumps. The method of claim 14, The first and second electrode pads are formed to have a larger size than the first and second electrode bumps, and the third and fourth electrode pads are formed to be larger than the third and fourth electrode bumps. The method of claim 14, And a light transmissive epoxy resin filled between the first integrated circuit board and the first optical device array and between the second integrated circuit board and the second optical device array. The method of claim 14, Each of the first and second optical devices is any one selected from a vertical cavity surface emitting laser (VCSEL), a light emitting diode (LED), and a photo diode. The method of claim 14, A first connection bump connecting the first integrated circuit board and the printed circuit board; A second connection bump connecting the second integrated circuit board and the printed circuit board; A first signal line formed on the first integrated circuit board and connected to the first electrode pad; A second signal line formed on the second integrated circuit board and connected to the third electrode pad; A third connection bump connecting the first semiconductor chip and the first signal line; And A fourth connection bump connecting the second semiconductor chip and the second signal line Photoelectric conversion module further comprising. Printed circuit board; A bare substrate mounted on the printed circuit board and having an optical waveguide array penetrating from one side portion to the other side, and having first and second electrode pads formed on one side wall; An optical element array having first and second electrode bumps connected to the first and second electrode pads, respectively, on one side wall facing the bare substrate, and having an optical element in a central portion thereof; And A semiconductor chip mounted on the printed circuit board Photoelectric conversion module comprising a. The method of claim 21, The first and second electrode pad is a photoelectric conversion module, the position is formed so that the optical coupling is generated between the optical waveguide array and the optical element when connected to the first and second electrode bumps. The method of claim 21, The first and second electrode pads have a larger size than the first and second electrode bumps. The method of claim 21, A photoelectric conversion module filled with a transparent epoxy resin between the integrated circuit board and the optical device array. The method of claim 21, The optical device is any one selected from a vertical cavity surface emitting laser (VCSEL), a light emitting diode (LED) or a photo diode. The method of claim 21, A first signal line formed on the printed circuit board; A second signal line formed under the bare substrate and connected to the second electrode pad; A first connection bump connected to the semiconductor chip and the first signal line; And A second connection bump connecting the first signal line and the second signal line; Photoelectric conversion module further comprising. The method of claim 21, A first signal line formed on the semiconductor chip; A second signal line formed on the bare substrate and connected to the second electrode pad; And A wire connecting the first signal line and the second signal line Photoelectric conversion module further comprising. The method of claim 21, And an integrated circuit board mounted between the semiconductor chip and the printed circuit board. 29. The method of claim 28, A first signal line formed on the printed circuit board; A first connection bump connecting the integrated circuit board and the first signal line; A second signal line formed under the bare substrate and connected to the second electrode pad; A second connection bump connecting the first signal line and the second signal line; A third connection bump connecting the semiconductor chip and the integrated circuit board; Photoelectric conversion module further comprising. The method of claim 21, A first signal line formed on the printed circuit board; A second signal line formed under the bare substrate and connected to the second electrode pad; A connection bump connected to the semiconductor chip and the first signal line; And A connection pin connecting the first signal line and the second signal line Photoelectric conversion module further comprising.

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