Optical transmission module

Abstract

The invention relates to an optical transmission module. The optical transmission module comprises a substrate, a transmitting end and a receiving end, the substrate defines a thickness direction and comprises a light transmission channel and two refraction parts positioned on two opposite sides of the light transmission channel, and at least part of each refraction part has a refractive index which is gradually increased or gradually decreased along the thickness direction; the transmitting end comprises a light transmitter and a driver which are arranged on the substrate, and the light transmitter is electrically connected with the driver through wire bonding; the receiving end comprises an optical receiver and a transimpedance amplifier which are arranged on the substrate, and the optical receiver is electrically connected with the transimpedance amplifier through wire bonding; wherein at least one of the light emitter and the light receiver comprises a light passing surface and a conductive surface which are oppositely arranged, and each light passing surface faces one refraction part.

Description

Technical Field

[0001] The present invention relates to optical transmission technology, and in particular to an optical transmission module. Background Art

[0002] In the existing optical signal transmission technology, the pins of the optical transmitter and its light-emitting surface (or the optical receiver and its light-receiving surface) are arranged on the same side, the light-emitting surface corresponds to an optical waveguide plate, and the pins need to be electrically connected to a circuit board at the same time. Due to the errors in the manufacturing of each component, the light-emitting surface and the optical waveguide plate may not be accurately aligned, resulting in concerns such as poor coupling effect and optical signal loss.

[0003] Furthermore, in existing optical transmission devices, there is often an air gap between the optical waveguide plate and the optical transmitter or the optical receiver, which causes the divergence angle of the light beam emitted from the optical transmitter or the divergence angle of the light emitted from the optical waveguide to increase, which also causes problems such as poor coupling effect and optical signal loss. In addition, the wires connected between the optical transmitter and a driver need to be cross-connected, which are prone to mutual interference, which also leads to poor photoelectric transmission effect, and there are shortcomings that need to be improved urgently.

[0004] Therefore, it is necessary to provide a novel and advanced optical transmission module to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical transmission module which can effectively reduce light loss and has a good photoelectric transmission effect.

[0006] To achieve the above-mentioned purpose, the present invention provides an optical transmission module, comprising: a substrate, a transmitting end and a receiving end. The substrate defines a thickness direction and includes an optical transmission channel and two refractive parts located on two opposite sides of the optical transmission channel, the optical transmission channel includes two first reflection surfaces respectively oblique to the thickness direction, each of the first reflection surfaces corresponds to one of the refractive parts, and each of the refractive parts at least partially has a refractive index that gradually increases or decreases along the thickness direction; the transmitting end includes an optical transmitter and a driver disposed on the substrate, and the optical transmitter is electrically connected to the driver by wire bonding; the receiving end includes an optical receiver and a transimpedance amplifier disposed on the substrate, and the optical receiver is electrically connected to the transimpedance amplifier by wire bonding; wherein at least one of the optical transmitter and the optical receiver includes an optical pass surface and a conductive surface disposed opposite to each other, and each of the optical pass surfaces faces one of the refractive parts.

[0007] To achieve the above-mentioned purpose, the present invention provides an optical transmission module, comprising: a substrate, a transmitting end, a receiving end and at least one light-guiding mechanism. The substrate defines a thickness direction and includes an optical transmission channel and two refractive parts located on two opposite sides of the optical transmission channel, the optical transmission channel includes two first reflection surfaces respectively inclined to the thickness direction, each of the first reflection surfaces corresponds to one of the refractive parts, and each of the refractive parts at least partially has a refractive index that gradually increases or decreases along the thickness direction; the transmitting end includes an optical transmitter and a driver disposed on the substrate, and the optical transmitter is electrically connected to the driver by wire bonding; the receiving end includes an optical receiver and a transimpedance amplifier disposed on the substrate, and the optical receiver is electrically connected to the transimpedance amplifier by wire bonding; at least one of the optical transmitter and the optical receiver is offset from the two refractive parts in the thickness direction, and each of the light-guiding mechanisms is connected between one of the optical transmitter and the optical receiver and one of the refractive parts.

[0008] At least one of the light emitter and the light receiver has a light-transmitting surface and a conductive surface on a side away from the substrate, and each of the light-transmitting surfaces and one of the refractive parts are offset in the thickness direction.

[0009] At least one of the transmitting end and the receiving end further comprises two conducting wires, and the two conducting wires are connected between the driver and one of the transimpedance amplifier and the conductive surface in a non-intersecting manner.

[0010] The optical transmission module further comprises at least one first covering material disposed on the substrate, wherein each of the first covering materials covers and integrally connects the optical transmitter and the driver or the optical receiver and the transimpedance amplifier.

[0011] The light transmission channel includes a transmission layer and a first cladding layer located at one side of the transmission layer. The two refractive parts are integrally connected to the first cladding layer and exposed at one side of the substrate.

[0012] Each of the light-guiding mechanisms is a flexible polymer wire, one end of which is connected to a light-passing surface of one of the light emitter and the light receiver, and the other end is connected to an end surface of the refractive part relatively away from the light transmission channel.

[0013] Each of the light guide mechanisms comprises at least one light guide body and at least one second reflection surface arranged on the at least one light guide body. The second reflection surface of each of the light guide mechanisms corresponds to one of the refractive parts and the first reflection surface in the thickness direction.

[0014] The optical transmission module further comprises at least one second covering material disposed on the substrate, wherein each of the second covering materials covers and integrally connects one of the optical transmitter and the optical receiver and one of the light guide mechanisms.

[0015] Each of the light guiding mechanisms includes a light input end and a light output end, and at least one of the light input end and the light output end has a refractive index that gradually increases or decreases along a light guiding direction of the light guiding mechanism.

[0016] Each of the light-guiding mechanisms comprises a light-entering end and a light-emitting end, and a radial dimension of each of the light-entering end and the light-emitting end is not greater than a radial dimension of a refractive portion.

[0017] Beneficial effects of the present invention: An optical transmission module of the present invention can effectively reduce light loss and has a good photoelectric transmission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of a first preferred embodiment of the present invention.

[0019] Figure 2 for Figure 1 A partial enlarged view of .

[0020] Figure 3 FIG. 1 is a top view schematically showing the connection between a light emitter and a driver according to a first preferred embodiment of the present invention.

[0021] Figure 4 It is a cross-sectional schematic diagram of a second preferred embodiment of the present invention.

[0022] Figure 5 for Figure 4 A partial enlarged view of .

[0023] Figure 6 It is a top view schematic diagram of the connection between a light emitter, a driver and a light guide mechanism according to the second preferred embodiment of the present invention.

[0024] Figure 7 It is a cross-sectional schematic diagram of a third preferred embodiment of the present invention.

[0025] Figure 8 for Figure 7 A partial enlarged view of .

[0026] 1,1a: Optical transmission module

[0027] 10:Substrate

[0028] 11: Optical transmission channel

[0029] 111: first reflection surface

[0030] 112: Transport layer

[0031] 113: First coating

[0032] 114: Second coating

[0033] 12a, 12b: Refraction part

[0034] 121: Refraction layer

[0035] 20: Transmitter

[0036] 21,21a: Light emitter

[0037] 211,311,211a,311a: light pass surface

[0038] 212,312,212a,312a: Conductive surface

[0039] 22: Drive

[0040] 23,33: Wire

[0041] 30: Receiver

[0042] 31,31a: Optical receiver

[0043] 32: Transimpedance Amplifier

[0044] 40: First cladding material

[0045] 50,50a: Light guide mechanism

[0046] 51: Light input end

[0047] 52: Light output end

[0048] 53: Light guide

[0049] 54: Second reflection surface

[0050] 60: Second covering material DETAILED DESCRIPTION

[0051] The following are only examples to illustrate possible implementations of the present invention, but are not intended to limit the scope of the present invention. The "one" or "at least one" preceding the nouns mentioned in the text does not limit the quantity, and it can also be "plural" according to needs. This change in quantity is also within the scope of the protection, which is stated in advance.

[0052] Please refer to Figures 1 to 3 , which shows a preferred embodiment of the present invention. The optical transmission module 1 of the present invention includes a substrate 10, a transmitting end 20 and a receiving end 30.

[0053] The substrate 10 defines a thickness direction and includes an optical transmission channel 11 and two refractive parts 12a, 12b located on two opposite sides of the optical transmission channel 11, the optical transmission channel 11 includes two first reflective surfaces 111 respectively oblique to the thickness direction, each of the first reflective surfaces 111 corresponds to one of the refractive parts 12a, 12b, and each of the refractive parts 12a, 12b at least partially has a refractive index that gradually increases or decreases along the thickness direction; the transmitting end 20 includes an optical transmitter 21 (for example but not limited to a light emitting diode) and a driver 22 disposed on the substrate 10, and the optical transmitter 21 is electrically connected to the driver 22 by wire bonding; the receiving end 30 includes an optical receiver 31 (for example but not limited to a photodiode (PD)) and a transimpedance amplifier 32 (TIA) disposed on the substrate 10, and the optical receiver 31 is electrically connected to the transimpedance amplifier 32 by wire bonding. Thus, the two refractive parts 12a, 12b are helpful to guide and converge the light, reduce the scattering and loss of the optical signal, and through the connection method of wire bonding, the transmission distance and noise interference can be reduced, and the photoelectric transmission effect is good.

[0054] In this embodiment, at least one of the light emitter 21 and the light receiver 31 includes a light passing surface 211, 311 and a conductive surface 212, 312 disposed opposite to each other, and each of the light passing surfaces 211, 311 faces one of the refractive portions 12a, 12b, which can accurately couple light and facilitate wiring. Figure 3 At least one of the transmitting end 20 and the receiving end 30 further includes two wires 23, 33, which are preferably connected between the driver 22 and the transimpedance amplifier 32 and one of the conductive surfaces 212, 312 in a non-interlaced manner, thereby reducing the signal interference caused by the cross-line, which helps to improve the optical transmission efficiency. In other embodiments, the two wires can also be interlaced with each other, and the setting can be adjusted according to the configuration requirements.

[0055] Preferably, the optical transmission module 1 further includes at least one first covering material 40 disposed on the substrate 10, each of the first covering materials 40 covers and integrally connects the optical transmitter 21 and the driver 22 or the optical receiver 31 and the transimpedance amplifier 32, and is packaged and fixed to effectively avoid relative displacement between components. The first covering material 40 can preferably integrally cover the two wires 23, 33, and the assembly stability is good; the first covering material 40 can, for example, be a molding compound, which has an electromagnetic shielding effect and a thermal conductivity greater than 3W / mK, thereby reducing electromagnetic wave interference and having a good heat dissipation effect. In other embodiments, the first covering material can also cover the optical transmitter, the driver, the optical receiver and the transimpedance amplifier separately to maintain the flexibility of the optical transmission module.

[0056] Each of the refractive parts 12a, 12b includes a plurality of refractive layers 121 stacked one on another along the thickness direction. The plurality of refractive layers 121 have different refractive indices and can be integrally formed or layer by layer formed. The refractive index and thickness of each refractive layer 121 can be adjusted and configured according to light guiding requirements. In detail, the optical transmission channel 11 includes a transmission layer 112 and a first cladding layer 113 (cladding) located on one side of the transmission layer 112. The two refractive parts 12a, 12b are integrally connected to the first cladding layer 113 and exposed on one side of the substrate 10, which is convenient for relative connection with the light passing surface 211, 311 of the optical transmitter 21 or the optical receiver 31. The first reflective surface 111 is used to reflect a light signal and extends from a side of the substrate 10 away from one of the refractive parts 12a, 12b to the first cladding layer 113. The light signal can be transmitted from the light emitter 21 toward the transmission layer 112 or from the transmission layer 112 toward the light receiver 31. The light transmission channel 11 further includes a second cladding layer 114 opposite to the first cladding layer 113. Each of the first cladding layer 113 and the second cladding layer 114 can be gaseous, solid or liquid, such as but not limited to air, water, metal or any other material with a refractive index lower than that of the transmission layer 112, so that the light signal can be transmitted in the light transmission channel 11 in a total reflection manner.

[0057] Please also refer to Figures 4 to 6 The second preferred embodiment shown is different from the first preferred embodiment described above in that: the optical transmission module 1a further includes at least one light guide mechanism 50, at least one of the light emitter 21a and the light receiver 31a is offset from the two refractive parts 12a, 12b in the thickness direction, and each of the light guide mechanisms 50 is connected between one of the light emitter 21a and the light receiver 31a and one of the refractive parts 12a, 12b. Thus, each of the light-passing surfaces 211a, 311a and one of the refractive parts 12a, 12b is coupled to each other through the light guide mechanism 50, which is accurate and easy to process.

[0058] Specifically, at least one of the light emitter 21a and the light receiver 31a has the light-passing surface 211a, 311a and the conductive surface 212a, 312a on the side away from the substrate 10, and each of the light-passing surfaces 211a, 311a and one of the refractive parts 12a, 12b are offset in the thickness direction, which helps to shorten the configuration spacing between the light emitter 21a and the driver 22 or the light receiver 31a and the transimpedance amplifier 32, thereby shortening the wire bonding distance, which also helps to improve the photoelectric transmission efficiency.

[0059] In this embodiment, each of the light guide mechanisms 50 is a flexible polymer wire, one end of which is connected to the light passing surface 211a, 311a of one of the light emitter 21a and the light receiver 31a, and the other end is connected to an end surface of the refractive portion 12a, 12b relatively away from the light transmission channel 11. Each of the light guide mechanisms 50 includes a light input end 51 and a light output end 52, and at least one of the light input end 51 and the light output end 52 has a refractive index that gradually increases or decreases along a light guiding direction of the light guide mechanism 50, effectively guiding the optical signal and avoiding scattering loss. Preferably, a radial dimension of each of the light input end 51 and the light output end 52 is not greater than a radial dimension of the refractive portion 12a, 12b, and the radial dimension of each of the light input end 51 and the light output end 52 gradually increases toward the refractive portion 12a, 12b, which can provide a light guiding effect, facilitate coupling, and reduce light loss. In other embodiments, each of the light-incoming end portion and the light-emitting end portion may also have only a single radial dimension; each of the light-incoming end portion and the light-emitting end portion may also have a single refractive index.

[0060] Preferably, the optical transmission module 1a further includes at least one second covering material 60 disposed on the substrate 10, each of the second covering materials 60 covers and integrally connects one of the optical transmitter 21a and the optical receiver 31a and one of the light guide mechanisms 50, and the assembly stability is good. Further, the first covering material 40 only covers the driver 22 (or the transimpedance amplifier 32) and part of the two wires 23, 33, and at the same time maintains a distance from the second covering material 60, so that the optical transmission module 1 maintains better flexibility. The materials of the first covering material 40 and the second covering material 60 are different. The second covering material 60 is preferably made of a low refractive index material, and the refractive index of the low refractive index material is lower than the refractive index of the light guide mechanism 50. Preferably, the refractive index of the low refractive index material is between 1.45 and 1.6, and can be selected according to the material of the light guide mechanism 50 to provide a better light guide effect. Furthermore, each of the second covering materials 60 preferably completely covers one of the light-passing surfaces 211a, 311a and one end surface of the refractive portion 12a, 12b, effectively reducing light loss. In other embodiments, the materials of the first covering material and the second covering material may be the same; the first covering material and the second covering material may be connected as one; the light emitter, the driver and the light guide mechanism may be covered and packaged as one by the first covering material or the second covering material; the light receiver, the transimpedance amplifier and the light guide mechanism may be covered and packaged as one by the first covering material or the second covering material.

[0061] Please also refer to Figure 7 and Figure 8The third preferred embodiment shown in the figure is mainly different from the second preferred embodiment described above in that each of the light guide mechanisms 50a includes at least one light guide 53 and at least one second reflection surface 54 disposed on the at least one light guide 53. The second reflection surface 54 of each of the light guide mechanisms 50a corresponds to one of the refractive portions 12a, 12b and the first reflection surface 111 in the thickness direction. The at least one light guide 53 is, for example but not limited to, an integrally formed light guide lens and includes two second reflection surfaces 54. One of the two second reflection surfaces 54 faces the light passing surface 211a, 311a of the light transmitter 21a or the light receiver 31a, and the other faces one of the refractive portions 12a, 12b, so as to guide the light signal to be turned and transmitted, and the structural strength and assembly stability are good. In other embodiments, the at least one light guide may also include a plurality of light guide lenses that are interconnected, and may be provided with different numbers of second reflective surfaces according to configuration requirements; each of the light guides may also be made of other light guide materials to allow light to be transmitted between one of the light passing surfaces and one of the refractive parts.

Claims

1. An optical transmission module, characterized in that: include: A substrate, defining a thickness direction, including a light transmission channel and two refractive parts located at two opposite sides of the light transmission channel, the light transmission channel including two first reflective surfaces respectively oblique to the thickness direction, each of the first reflective surfaces corresponding to one of the refractive parts, and each of the refractive parts at least partially having a refractive index that gradually increases or decreases along the thickness direction; a transmitting end, comprising a light emitter and a driver disposed on the substrate, wherein the light emitter is electrically connected to the driver by wire bonding; and A receiving end, comprising an optical receiver and a transimpedance amplifier disposed on the substrate, wherein the optical receiver is electrically connected to the transimpedance amplifier by wire bonding; At least one of the light emitter and the light receiver comprises a light-transmitting surface and a conductive surface that are arranged opposite to each other, and each of the light-transmitting surfaces faces one of the refractive parts.

2. An optical transmission module, characterized in that: include: A substrate, defining a thickness direction, including a light transmission channel and two refractive parts located at two opposite sides of the light transmission channel, the light transmission channel including two first reflective surfaces respectively oblique to the thickness direction, each of the first reflective surfaces corresponding to one of the refractive parts, and each of the refractive parts at least partially having a refractive index that gradually increases or decreases along the thickness direction; A transmitting end, comprising a light emitter and a driver disposed on the substrate, wherein the light emitter is electrically connected to the driver by wire bonding; a receiving end, comprising an optical receiver and a transimpedance amplifier disposed on the substrate, wherein the optical receiver is electrically connected to the transimpedance amplifier by wire bonding; and At least one light guide mechanism, at least one of the light emitter and the light receiver is offset from the two refractive parts in the thickness direction, and each of the light guide mechanisms is connected between one of the light emitter and the light receiver and one of the refractive parts.

3. The optical transmission module according to claim 2, wherein: At least one of the light emitter and the light receiver has a light-transmitting surface and a conductive surface on a side away from the substrate, and each of the light-transmitting surfaces and one of the refractive parts are offset in the thickness direction.

4. The optical transmission module according to claim 1 or 3, characterized in that: At least one of the transmitting end and the receiving end further comprises two conducting wires, and the two conducting wires are connected between the driver and one of the transimpedance amplifier and the conductive surface in a non-intersecting manner.

5. The optical transmission module according to claim 1 or 2, characterized in that: The invention also comprises at least one first covering material arranged on the substrate, wherein each of the first covering materials covers and integrally connects the light emitter and the driver or the light receiver and the transimpedance amplifier.

6. The optical transmission module according to claim 1 or 2, characterized in that: The light transmission channel includes a transmission layer and a first cladding layer located at one side of the transmission layer. The two refractive parts are integrally connected to the first cladding layer and exposed at one side of the substrate.

7. The optical transmission module according to claim 2, wherein: Each of the light-guiding mechanisms is a flexible polymer wire, one end of which is connected to a light-passing surface of one of the light emitter and the light receiver, and the other end is connected to an end surface of the refractive part relatively away from the light transmission channel.

8. The optical transmission module according to claim 2, wherein: Each of the light guide mechanisms comprises at least one light guide body and at least one second reflection surface arranged on the at least one light guide body. The second reflection surface of each of the light guide mechanisms corresponds to one of the refractive parts and the first reflection surface in the thickness direction.

9. The optical transmission module according to claim 2, wherein: The invention also comprises at least one second covering material arranged on the substrate, wherein each of the second covering materials covers and integrally connects one of the light emitter and the light receiver and one of the light guide mechanisms.

10. The optical transmission module according to claim 2, wherein: Each of the light guiding mechanisms includes a light input end and a light output end, and at least one of the light input end and the light output end has a refractive index that gradually increases or decreases along a light guiding direction of the light guiding mechanism.

11. The optical transmission module according to claim 2, wherein: Each of the light-guiding mechanisms comprises a light-entering end and a light-emitting end, and a radial dimension of each of the light-entering end and the light-emitting end is not greater than a radial dimension of a refractive portion.

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