CN110618504A - Optical module - Google Patents
Optical module Download PDFInfo
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- CN110618504A CN110618504A CN201910905022.5A CN201910905022A CN110618504A CN 110618504 A CN110618504 A CN 110618504A CN 201910905022 A CN201910905022 A CN 201910905022A CN 110618504 A CN110618504 A CN 110618504A
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- wave
- focusing lens
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- focusing
- parallel optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
Abstract
The present invention provides an optical module, including: wavelength division demultiplexing components, coupling components and detector chips; the wavelength division demultiplexing component is used for decomposing a received one-path wave combination parallel optical signal containing at least two wavelengths into at least two-path single-wave parallel optical signals; the coupling component is used for carrying out focusing reflection processing on the at least two single-wave parallel optical signals and focusing the at least two single-wave parallel optical signals subjected to focusing reflection processing on a detector chip; the detector chip is used for receiving the at least two paths of single-wave parallel optical signals and converting the at least two paths of single-wave parallel optical signals into electric signals.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical module.
Background
With the rapid development of optical communication and internet technologies, people have higher and higher demands on network traffic, and as a core optical module for data exchange in an optical communication network, the transmission capacity and the transmission rate thereof also need to be further improved.
At present, a traditional 100Gb/s receiving optical module generally adopts a single lens or two lenses to perform light path collimation and focusing, but when the speed (up to 400Gb/s) and the number of channels of the optical module are greatly increased, the optical coupling tolerance is small, the difficulty of the packaging method is high, and the requirements of mass production and high reliability are not satisfied.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide an optical module, which has a better optical tolerance, a simple and convenient structure packaging method, and can meet the requirements of mass production and high reliability.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an embodiment of the present invention provides an optical module, including: wavelength division demultiplexing components, coupling components and detector chips; wherein the content of the first and second substances,
the wavelength division demultiplexing component is used for decomposing a received one-path wave combination parallel optical signal containing at least two wavelengths into at least two-path single-wave parallel optical signals;
the coupling component is used for carrying out focusing reflection processing on the at least two single-wave parallel optical signals and focusing the at least two single-wave parallel optical signals subjected to focusing reflection processing on a detector chip;
the detector chip is used for receiving the at least two paths of single-wave parallel optical signals and converting the at least two paths of single-wave parallel optical signals into electric signals.
In the above aspect, the coupling assembly includes: the device comprises a first focusing lens, a second focusing lens and a reflecting prism;
the first focusing lens, the second focusing lens and the reflecting prism are in a first relative position; the first relative position is a position where an image formed by the focal point of the first focusing lens through the reflecting prism coincides with an image formed by the detector chip through the second focusing lens.
In the above solution, the first focusing lens is configured to focus the at least two single-wave parallel optical signals onto the reflection prism;
the reflecting prism is used for reflecting the at least two paths of single-wave parallel optical signals to the second focusing lens;
the second focusing lens is used for focusing the at least two single-wave parallel optical signals onto the detector chip.
In the above solution, the first focusing lens and the second focusing lens each include a first surface and a second surface, and the first surface and the second surface are opposite surfaces; the first surface is a plane, and the second surface is a convex surface.
In the above solution, the focus of the first focusing lens coincides with the focus point of the optical path of the at least two single-wave parallel optical signals after being focused by the first focusing lens and reflected by the reflecting prism through the image formed by the reflecting prism.
In the above aspect, the optical module further includes: a collimating lens;
the collimating lens is used for receiving a path of wave-combining optical signal containing at least two wavelengths, collimating the path of wave-combining optical signal containing at least two wavelengths into parallel light, obtaining a path of wave-combining parallel optical signal containing at least two wavelengths, and transmitting the path of wave-combining parallel optical signal containing at least two wavelengths.
In the above scheme, the collimating lens and the optical port that emits a combined wave optical signal including at least two wavelengths are located at a second relative position; and the second relative position is a position where the focal point of the collimating lens coincides with the position of the optical center of the optical port.
In the above aspect, the optical module further includes: a turning prism;
the turning prism is used for receiving the one-path wave-combination parallel optical signal containing at least two wavelengths after the collimation processing of the collimating lens, translating the one-path wave-combination parallel optical signal containing at least two wavelengths to a preset direction for a preset distance, and outputting and sending the signal to the wavelength division demultiplexing component.
In the above aspect, the focal point of the second focusing lens is located below the image formed by the focal point of the first focusing lens passing through the reflecting prism.
In the above scheme, the number of channels of the first focusing lens and the second focusing lens is the same as the number of optical paths of the at least two single-wave parallel optical signals.
In the optical module provided by the embodiment of the present invention, the wavelength division demultiplexing component decomposes a received one-path combined wave parallel optical signal including at least two wavelengths to obtain at least two-path single-wave parallel optical signals; and carrying out focusing and reflecting treatment on the at least two single-wave parallel optical signals through a coupling assembly, and focusing the at least two single-wave parallel optical signals subjected to focusing and reflecting treatment on a detector chip to realize the reception of the optical signals. Therefore, the optical module can have larger optical coupling tolerance through the combined action of the wavelength division demultiplexing component and the coupling component, so that the received optical signal is accurately focused on the detector chip.
Drawings
Fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
fig. 2 is a schematic 3D structure diagram of an optical module according to an embodiment of the present invention;
fig. 3 is a schematic side view of a 3D structure of a coupling component in an optical module according to an embodiment of the present invention;
fig. 4 is a schematic optical path diagram of a coupling component in an optical module according to an embodiment of the present invention;
fig. 5 is a schematic optical path diagram of a collimating lens and an optical port in an optical module according to an embodiment of the present invention;
fig. 6 is a schematic overall optical path diagram of an optical module according to an embodiment of the present invention;
fig. 7 is an overall optical path schematic diagram of another optical module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a 3D application example of an optical module according to an embodiment of the present invention;
fig. 9 is a perspective view of a 3D structure of a coupling assembly in an optical module according to an embodiment of the present invention;
fig. 10 is a perspective view of a 3D structure of an optical module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to achieve a better optical coupling tolerance, an embodiment of the present invention provides an optical module, fig. 1 is a schematic structural diagram of the optical module provided in the embodiment of the present invention, and as shown in fig. 1, the optical module 100 includes: a wavelength division demultiplexing component 101, a coupling component 102 and a detector chip 103; wherein the content of the first and second substances,
the wavelength division demultiplexing component 101 is configured to decompose a received one-path combined wave parallel optical signal including at least two wavelengths into at least two-path single-wave parallel optical signals;
the coupling component 102 is configured to perform focusing and reflecting processing on the at least two single-wave parallel optical signals, and focus the at least two single-wave parallel optical signals subjected to focusing and reflecting processing on the detector chip 103;
the detector chip 103 is configured to receive the at least two single-wave parallel optical signals and convert the at least two single-wave parallel optical signals into electrical signals.
It should be noted that the optical module 100 in the embodiment of the present invention may be used in a high-speed light receiving device.
The one-path wave-combining parallel optical signal containing at least two wavelengths received by the wavelength division demultiplexing component 101 is a parallel collimated optical signal. Here, parallel collimation processing of the optical signal may be achieved by a collimating lens; that is, the wavelength division demultiplexing component 101 may receive a parallel optical signal of a combined wave including at least two wavelengths, which is obtained by collimating through a collimating lens.
The wavelength division demultiplexing component 101 is configured to implement decomposition of the composite optical signal, and decompose the composite optical signal into a plurality of single-wave optical signals. The wavelength division demultiplexing component 101 includes an incident end surface and an exit end surface.
The incident end surface of the wavelength division demultiplexing component 101 is configured to receive a combined-wave parallel optical signal including at least two wavelengths, and the exit end surface of the wavelength division demultiplexing component 101 is configured to emit the at least two single-wave parallel optical signals. For example, a combined parallel optical signal containing 4 wavelengths enters the entrance end face of the wavelength division demultiplexing module 101, and through demultiplexing processing of the wavelength division demultiplexing module 101, 4 single-wave parallel optical signals with different wavelengths are emitted from the exit end face of the wavelength division demultiplexing module 101.
The focusing reflection treatment comprises focusing treatment and reflection treatment; the focusing processing means processing the at least two single-wave parallel optical signals through a focusing lens to realize focusing of an optical path; the reflection processing means processing the parallel optical signal containing at least two paths of single waves through a reflection prism to realize the reflection of the optical path.
Here, through the combined action of the wavelength division demultiplexing component 101 and the coupling component 102, the optical signal can be precisely focused on the detector chip 103, and the whole optical element depends on the optical path structure, so that the optical coupling tolerance is large.
It should be noted that, as described above, in order to realize the collimation of the divergent optical signal into the parallel optical signal; the light module further includes: a collimating lens; the collimating lens is used for receiving a path of wave-combining optical signal containing at least two wavelengths, collimating the path of wave-combining optical signal containing at least two wavelengths into parallel light, obtaining a path of wave-combining parallel optical signal containing at least two wavelengths, and transmitting the path of wave-combining parallel optical signal containing at least two wavelengths.
The one-path wave-combined optical signal containing at least two wavelengths received by the collimating lens can be emitted by an optical port; the light port can be round, square, etc. Specifically, the optical port is an optical receiving port, and the optical port may be a part of the optical module, and is configured to receive a combined wave optical signal including at least two wavelengths and transmitted or transmitted by another laser device \ an optical fiber, and the like.
Optionally, the optical module may further include: a turning prism; the turning prism is used for receiving the one-path wave-combination parallel optical signal containing at least two wavelengths after the collimation processing of the collimating lens, translating the one-path wave-combination parallel optical signal containing at least two wavelengths to a preset direction for a preset distance, and sending the one-path wave-combination parallel optical signal containing at least two wavelengths to the wavelength division demultiplexing component.
It should be noted that the turning prism can simplify the structural design of the high-speed optical module, reduce the structural design limitation, and improve the flexibility of the optical path structure and the mechanical structure.
The preset direction can be vertical directions such as upward direction, downward direction and the like, the preset distance can be any distance, and the preset distance can be set according to actual needs. It should be noted that the preset direction and the preset distance are required to be set to ensure that one combined wave parallel optical signal containing at least two wavelengths and collimated by the collimating lens can be received, and the one combined wave parallel optical signal containing at least two wavelengths and translated by the preset distance can be transmitted to the incident end face of the wavelength division demultiplexing component.
It should be further noted that, in order to ensure that the optical module has better optical coupling tolerance, the coupling assembly provided in the embodiment of the present invention may be composed of two focusing lenses and a reflecting prism, that is, the coupling assembly includes: the device comprises a first focusing lens, a reflecting prism and a second focusing lens;
the first focusing lens and the second focusing lens respectively comprise a first surface and a second surface, and the first surface and the second surface are opposite surfaces; the first surface is a plane, and the second surface is a convex surface.
The first focusing lens is used for focusing the at least two single-wave parallel optical signals to the reflecting prism;
the reflecting prism is used for reflecting the at least two paths of single-wave parallel optical signals to the second focusing lens;
the second focusing lens is used for focusing the at least two single-wave parallel optical signals onto the detector chip.
The positional relationship between the above optical devices may be:
the first focusing lens, the second focusing lens and the reflecting prism are in a first relative position; the first relative position is a position where an image formed by the focal point of the first focusing lens through the reflecting prism coincides with an image formed by the detector chip through the second focusing lens.
The collimating lens and an optical port for transmitting a combined wave optical signal containing at least two wavelengths are positioned at a second relative position; and the second relative position is a position where the focal point of the collimating lens coincides with the position of the optical center of the optical port.
The following describes the specific structure of the optical module in detail:
fig. 2 is a schematic 3D structure diagram of an optical module according to an embodiment of the present invention; as shown in fig. 2, the collimating lens 104 is fixed in the light-passing hole of the optical carrying platform by a metal ring; the center of the collimator lens 104 is aligned with the center of the reflection slope of the bending prism 105, and the center of the light exit surface of the bending prism 105 is aligned with the center of the incident end surface of the wavelength division demultiplexing assembly 101. The first focusing lens 1021 corresponds to the emergent end face of the wavelength division demultiplexing component 101 and is used for decomposing the wavelength division demultiplexing component 101 to obtain four paths of single-wave parallel optical signals, and focusing the four paths of single-wave parallel optical signals to the reflecting prism 1022; the reflection prism 1022 reflects the four-path single-wave parallel light signals to the second focusing lens 1023; and then focused on the center of the photosensitive surface of the detector chip 103 through the second focusing lens 1023. The photosensitive surface of the detector chip 103 is a surface corresponding to the second surface of the second focusing lens 1023.
In fig. 2, the coupling assembly 102 is composed of a first focusing lens 1021, a reflection prism 1022, and a second focusing lens inside the dotted line. A combined wave optical signal including at least two wavelengths incident into the optical module may be emitted from the optical port 106 shown in fig. 2; wherein the optical port 106 can be fixed to the metal ring by active coupling. Thus, a combined-wave optical signal including at least two wavelengths emitted from the optical port 106 can be collimated by the collimating lens 104 to be a combined-wave parallel optical signal including at least two wavelengths, and the combined-wave optical signal is emitted to the turning prism 105 to be transmitted to the wavelength division demultiplexing component 101 through optical path translation, and is decomposed in the wavelength division demultiplexing component 101 to be a four-path single-wave parallel optical signal, and then the four-path single-wave parallel optical signal is output to the first focusing lens 1021, focused by the first focusing lens 1021, reflected by the reflecting prism 1022, focused by the second focusing lens 1023, and finally focused on the photosensitive surface of the detector chip 103.
When the optical module does not include the turning prism 105, the optical port 106, the metal ring, and the collimating lens 104 may be moved by a predetermined distance in a predetermined direction, so that the optical signal emitted from the optical port 106 can be aligned with the incident end surface of the wavelength division demultiplexing module 101. In fig. 2, when the turning prism 105 is not included in the optical module, the light opening 106, the metal ring, and the collimator lens 104 need to be moved upward by a predetermined distance as a whole.
It should be further noted that, in order to achieve coupling alignment of the optical path and improve coupling tolerance, the first focusing lens 1021 needs to correspond to at least two single-wave parallel optical signals obtained after being decomposed by the wavelength division demultiplexing component 101, so as to achieve focusing processing on the at least two single-wave parallel optical signals, and thus, the first focusing lens 1021 may be an array focusing lens or at least two single focusing lenses; when at least two single focusing lenses are selected to form the focusing lens, each single focusing lens corresponds to one single-wave parallel optical signal. Based on this, as shown in fig. 2, when four single-wave parallel optical signals are obtained after being decomposed by the wavelength division demultiplexing component 101, the first focusing lens 1021 may be an array focusing lens or a combination of 4 single focusing lenses, and when the combination of 4 single focusing lenses is selected, each single focusing lens corresponds to one single-wave parallel optical signal in the four single-wave parallel optical signals.
Accordingly, since the second focusing lens 1023 needs to focus at least two single-wave parallel optical signals reflected by the reflection prism 1022, the second focusing lens 1023 may be an array focusing lens or at least two single focusing lenses; when at least two single focusing lenses are selected to form the focusing lens, each single focusing lens corresponds to one single-wave parallel optical signal. Based on this, as shown in fig. 2, when the four single-wave parallel optical signals are obtained after being decomposed by the wavelength division demultiplexing assembly 101, the second focusing lens 1023 may be an array focusing lens or a combination of 4 single focusing lenses, and when the combination of 4 single focusing lenses is selected, each single focusing lens corresponds to one single-wave parallel optical signal in the four single-wave parallel optical signals reflected by the reflection prism 1022.
In fig. 2, since the reflection prism 1022 is located on the optical path support, the position of the reflection prism 1022 is blocked by the optical path support. Here, to better illustrate the position of the reflection prism 1022, the embodiment of the present invention provides a schematic side view of a 3D structure of a coupling assembly in an optical module as shown in fig. 3, a first focusing lens 1021 and the reflection prism 1022 are both attached to a plane of an optical path support; the reflecting prism 1022 is adhered to an inclined surface of the optical path bracket. Here, when the reflection prism 1022 is a 45 ° reflection prism, the inclined surface of the optical path holder to which the 45 ° reflection prism 1022 is attached is also 45 °. The second focusing lens 1023 is adhered to a cushion block which is placed on the PCBA; the detector chip 103 is also placed on the PCBA.
The center of the second face, i.e., the convex surface, of each of the first focusing lenses 1021 is aligned with the center line of the inclined surface of the reflection prism 1022. The center of the second face of the second focusing lens 1023 is aligned with the center of the light-sensitive face of the detector chip 103.
It should be noted that fig. 2 to 3 illustrate the positional relationship of each optical device in the optical module, but in order to better implement the coupling of the optical path and increase the optical coupling tolerance of the optical module, in practical applications, the relative position of each optical component in the optical module needs to be defined to ensure that a large optical coupling tolerance can be achieved.
The relative position of each optical component in the optical path in the embodiment of the invention mainly comprises the following steps: the relative position of the optical assemblies in the coupling assembly, and the relative position between the collimating lens and the optical port from which the optical signal is emitted.
As described above, in the embodiment of the present invention, the first focusing lens, the second focusing lens, and the reflecting prism are disposed at the first relative position, and the collimating lens and the optical port that emits the combined wave optical signal including at least two wavelengths are disposed at the second relative position. The first relative position is a position where an image formed by the focal point of the first focusing lens through the reflecting prism coincides with an image formed by the detector chip through the second focusing lens. The second relative position is a position where the focal point of the collimating lens coincides with the position of the optical center of the optical port.
Here, the first relative position and the second relative position will be described:
with respect to the first relative position, i.e. the relative distance between the first focusing lens 1021, the reflection prism 1022 and the second focusing lens 1023 in the coupling assembly 102, can be set as follows: an image formed by the focal point of the first focusing lens 1021 in the reflection prism 1022 coincides with an image formed by the detector chip 103 in the second focusing lens 1023.
In addition, the first relative position enables an image formed by the reflection prism 1022 through the focal point of the first focusing lens 1021 to be overlapped with the optical path focal point of the at least two single-wave parallel optical signals focused by the first focusing lens 1021 and reflected by the reflection prism 1022.
Referring to the specific drawings, the first relative position is now described, and fig. 4 is a schematic optical path diagram of a coupling component in an optical module according to an embodiment of the present invention, as shown in fig. 4, a thin black solid line represents an optical path, a thick black solid line represents a hard circuit board PCBA, and a dashed black line represents a schematic focal point diagram and an imaging diagram of the first focusing lens 1021.
Fig. 4 shows a schematic diagram of the optical path of the single-wave parallel light signal in the first focusing lens 1021, the reflection prism 1022, and the second focusing lens 1023; here, the optical path diagram is a side view; in fig. 4, the optical signal incident on the first focusing lens 1021 is one of the at least two single-wave parallel optical signals decomposed by the wavelength division demultiplexing component.
As shown in fig. 4, the one single-wave parallel optical signal is incident on the first surface X of the first focusing lens 1021, passes through the first surface X, is focused by the second surface Y of the first focusing lens 1021 and is emitted to the emission prism 1022, and after being reflected by the emission prism 1022, the one single-wave parallel optical signal realizes focusing of an optical path at point C' in fig. 4; after focusing, the light is emitted to the first surface X of the second focusing lens 1023, and after passing through the first surface X, the light is focused by the second surface Y of the second focusing lens 1023 and emitted to the center D of the photosensitive surface of the detector chip 103. The second focusing lens 1023 is stuck on the spacer Z.
As described above, the first surface X and the second surface Y of the first focusing lens 1021 and the second focusing lens 1023 are both flat surfaces and convex surfaces; the first surface X is an incident end surface, and the second surface Y is a focusing end surface.
In practical applications, the first focusing lens 1021 and the second focusing lens 1022 may be convex lenses; the convex lens is a lens with a thicker central part and a thinner edge, and can focus light. Thus, the first surface X of the convex lens is used for receiving light rays and transmitting light rays; the second surface Y of the convex lens is used for focusing the light rays penetrating through the first surface X.
In the embodiment of the present invention, the at least two single-wave parallel optical signals enter from the first surfaces X of the first focusing lens 1021 and the second focusing lens 1023, enter into the second surfaces Y of the first focusing lens 1021 and the second focusing lens 1023, and are focused through the second surfaces Y.
The photosensitive surface of the detector chip 103 can sense optical signals, so that the optical signals can be received, and after the optical signals are received, the detector chip 103 converts the received optical signals into electrical signals, so that subsequent other processing can be realized.
As shown in fig. 4, said f1The dotted line AC represents a focal length of the first focus lens 1021 at a focal point of the first focus lens 1021, the point a is a center point of the second surface of the focus lens, and the point C is a focal point f of the first focus lens 10211Is located. Point B is an intersection of the focal length AC and the reflection surface of the reflection prism 1022, and point C' is a focal point f of the first focusing lens 10211An image f formed by the reflection prism 10221' in position; wherein BC and BC' are conjugated with respect to the reflecting prism 1022.
Preferably, the reflecting prism is a 45 ° reflecting prism.
As shown in fig. 4, the point C' is also an optical path focusing point of a single-wave parallel optical signal after being focused by the first focusing lens 1021 and reflected by the reflection prism 1022. That is, the focal point f of the first focus lens 10211Image f passing through reflection prism 10221'is overlapped with a focusing point C' of at least two single-wave parallel optical signals after being focused by the first focusing lens 1021 and reflected by the reflecting prism 1022.
Further, in fig. 4, f2Is the focal point of the second focusing lens 1022, said f2Located below point C'. The one single-wave parallel optical signal is focused at point C' and then diverged to propagate downward, and is focused on the center D of the photosensitive surface of the detector chip 103 through the second focusing lens 1023. The central D point of the photosurface is imaged by the second focusing lens 1023 at point C.
Note that the focal point of the second focusing lens 1023 is located below the image formed by the focal point of the first focusing lens 1021 through the reflection prism 1022.
In this way, through the combined action of the first focusing lens 1021, the reflection prism 1022 and the second focusing lens 1023, the at least two single-wave parallel optical signals can be precisely focused on the photosensitive surface of the detector chip 103, and the whole optical element is supported by the optical path structure, so that the optical coupling tolerance is large.
Regarding the second relative position, i.e. the relative position of the collimating lens and the light port:
fig. 5 is a schematic diagram of an optical path of a collimating lens and an optical port in an optical module according to an embodiment of the present invention, where, as shown in fig. 5, 104 denotes the collimating lens, 106 denotes the optical port, and 2 black solid lines denote a process of collimating divergent light rays into parallel light rays.
The collimating lens 104 is placed at a preset position; the preset position is a position where the focal point of the collimating lens 104 coincides with the position of the optical center of the optical port 106. f is the focus of the collimating lens 104, V is the position of the focus f of the collimating lens 104, and V is also the position of the optical center of the optical port 106; the position of the optical center of the optical port 106 is the central point position of the optical port. For example, assuming that the light port 106 is circular, the light center is located at a circular point.
Here, the optical signal emitted from the optical port 106 is divergent, and after passing through the collimator lens 104, the divergent optical signal becomes parallel collimated light to be emitted.
Thus, through the above positional relationship, a combined wave optical signal including at least two wavelengths emitted by the optical port 106 can enter the collimating lens 104 as losslessly as possible, and the collimation of the optical path is realized through the collimating lens 104, so as to obtain a combined wave parallel optical signal including at least two wavelengths. And a basis is provided for the wavelength division demultiplexing component to demultiplex the optical signal when the one-path wave-combination parallel optical signal containing at least two wavelengths enters the wavelength division demultiplexing component.
Here, the overall optical path of the optical module is described, and the overall optical path is embodied by the positional relationship and the corresponding optical path of the optical devices such as the wavelength division demultiplexing component, the coupling component, the collimating lens, the optical port, and the detector chip:
fig. 6 is a schematic overall optical path diagram of an optical module according to an embodiment of the present invention, and as shown in fig. 6, components in the optical module include a wavelength division demultiplexing component 601, a coupling component 602, a detector chip 603, and a collimating lens 604; wherein, the coupling assembly 602 includes a first focusing lens, a reflective prism, and a second focusing lens. In fig. 6, the light port is denoted by 605.
The collimating lens 604 is located between the optical port 605 and the wavelength division demultiplexing component 601, and is configured to receive a combined-wave optical signal including at least two wavelengths emitted from the optical port, collimate the combined-wave optical signal including at least two wavelengths into parallel light, obtain a combined-wave parallel optical signal including at least two wavelengths, and emit the combined-wave parallel optical signal including at least two wavelengths to an incident end surface of the wavelength division demultiplexing component 601.
The wavelength division demultiplexing component 601 is located between the collimating lens 604 and the coupling component 602, and a combined wave parallel optical signal including at least two wavelengths, which is incident to an incident end face of the wavelength division demultiplexing component 601, is demultiplexed by the wavelength division demultiplexing component 601 and then emitted to a first surface of a first focusing lens of the coupling component 602 by an emergent end face of the wavelength division demultiplexing component 601.
It should be noted that, in this embodiment, the one-path wavelength-multiplexed parallel optical signal including at least two wavelengths after being collimated by the collimating lens 604 is directly received by the wavelength division demultiplexing component 601.
Fig. 7 is an overall optical path schematic diagram of another optical module according to an embodiment of the present invention; as shown in fig. 7, the optical module includes: a wavelength division demultiplexing component 701, a coupling component 702, a detector chip 703, a collimating lens 704 and a turning prism 706; the coupling component 702 includes a first focusing lens, a reflective prism, and a second focusing lens. In fig. 7, the optical ports are indicated at 705.
The turning prism 706 is located between the collimating lens 704 and the wavelength division demultiplexing component 701, and is configured to receive a combined parallel optical signal that includes at least two wavelengths and is collimated by the collimating lens 704, translate the combined parallel optical signal that includes at least two wavelengths to a preset direction by a preset distance, and transmit the translated combined parallel optical signal to an incident end surface of the wavelength division demultiplexing component 701.
In the embodiment of the positional relationship shown in fig. 7, the predetermined direction of the optical path turning is upward, and the predetermined distance is a distance MN from the center of the collimator lens 704 to the upper surface of the wavelength division demultiplexing assembly 701.
It should be noted that the one-wave-combined parallel optical signal including at least two wavelengths entering the turning prism 706 is a parallel optical signal, and similarly, the one-wave-combined parallel optical signal including at least two wavelengths transmitted to the wavelength division demultiplexing component 701 after being processed by the turning prism 706 is also a parallel optical signal.
At least two paths of single-wave parallel optical signals sent by the wavelength division demultiplexing component 701 are respectively aligned with the centers of at least 2 convex mirrors of the first focusing lens; the center of the light exit surface of the turning prism 706 and the center of the entrance end face of the wavelength division multiplexer assembly 701 are aligned.
The wavelength division demultiplexing component 701 is positioned between the turning prism 706 and the coupling component 702; for receiving a parallel optical signal of a combined wave including at least two wavelengths after the translation processing of the turning prism 706.
It should be noted that, in the embodiment of the positional relationship shown in fig. 7, the turning prism 706 is provided so that the optical module may have various possibilities of positions of components in the package by changing the direction of the optical path if there is a change in other positions during the actual packaging process.
Therefore, the optical signals emitted by the optical port can be well coupled into the detector chip through the matching of the components.
It should be noted that after the optical path in the optical module is designed, a specific hardware package structure needs to be designed, and fig. 8 is a schematic diagram of an application example of a 3D structure of the optical module provided in the embodiment of the present invention; as shown in fig. 8, the detector chip and the optical circuit support are placed on the PCBA801, and the detector chip and the PCBA801 are directly electrically connected. The optical path holder 802 carries a first focusing lens and a reflecting prism. The wavelength division demultiplexing components, turning prisms, collimating lenses and optical ports are all placed on the optical load-bearing platform 803. The light path bracket 802 is placed on the PCBA801, and the PCBA801 is fixedly connected with the optical bearing platform 803; the WDM component and the turning prism are aligned to the passive mounting through the positioning boss on the optical bearing platform 803. The optical platform 803 may be made of metal, such as tungsten copper, stainless steel, kovar, etc.
Fig. 9 is a perspective view of a 3D structure of a coupling assembly in an optical module according to an embodiment of the present invention; such as
As shown in fig. 9, the reflection prism and the first focusing lens are attached to the optical path bracket, the inclined surface of the reflection prism is adhered to one inclined surface of the optical path bracket, and when the reflection prism is 45 °, the inclined surface of the optical path bracket for adhering the reflection prism is also 45 °. The detector chip is placed on the PCBA and electrically connected with the PCBA; the spacer is placed on the PCBA, and the second focusing lens is attached to the upper surface of the spacer.
Fig. 10 is a perspective view of a 3D structure of a light module according to an embodiment of the present invention; in fig. 10 is shown PCBA108, spacer 107, metal ring 109, glass mount 110, optical port 106, turning prism 105, collimating lens 104, wavelength division demultiplexing component 101, first focusing lens 1021, reflecting prism 1022, detector chip 103, second focusing lens 1023. The collimating lens 104 is fixed in the clear aperture of the optical carrier platform by a metal ring 109.
The second focusing lens 1023 includes at least two channels corresponding to the at least two single-wave parallel optical signals, in other words, each channel in the second focusing lens 1023 corresponds to one single-wave parallel optical signal; the centers of the second focusing lenses 1023 are aligned one-to-one with the centers of the photosensitive surfaces of the detector chips 103.
In the embodiment of the present invention, the detector chip, the first focusing lens, and the second focusing lens may be in an array form, that is, the detector chip is an array detector chip; the second focusing lens and the first focusing lens are array focusing lenses. Of course, the first focusing lens, the second focusing lens and the detector chip may also be a single focusing lens and a single detector chip, and when the first focusing lens, the second focusing lens and the detector chip are in a single form, the number of the first focusing lens, the second focusing lens and the detector chip is the same as the number of single-wave optical signals obtained after the composite optical signal is decomposed, that is, 4 paths of single-wave optical signals are obtained after the composite optical signal is decomposed by the wavelength division demultiplexing component. 4 first focusing lenses, 4 second focusing lenses, 4 detector chips are provided.
Here, the number of optical paths emitted from the emission end face of the wavelength division demultiplexing component is the same as the number of single focusing lenses included in the first focusing lens, wherein each single focusing lens can receive and emit one optical signal; that is, the number of channels of the first focusing lens is the same as the number of optical paths of the at least two single-wave parallel optical signals.
It should be noted that, in the above method for packaging the light receiving path and the optical module, most of the optical components are in a passive mounting manner, and only the light receiving port and the light path support are integrally coupled in an active manner; therefore, the packaging process method is simple and convenient. Here, the receiving light port and the light path support are integrally coupled in an active manner, which is more favorable for monitoring the responsivity of the light module.
Thus, an embodiment of the present invention provides an optical module, including: the device comprises an optical bearing platform, a collimating lens, a turning prism, a wavelength division demultiplexing component, a reflecting prism, a first focusing lens, a light path support, a second focusing lens and a detector chip. In the optical path structure, the collimating lens is used for collimating optical signals emitted from the optical port into parallel light, and after wavelength routing is performed through the wavelength division demultiplexing component, at least two paths of optical signals are matched through the first focusing lens, the reflecting prism and the second focusing lens which are arranged behind the collimating lens, so that the collimated light is focused and aligned on the detector chip. The optical coupling tolerance of the optical path structure of the optical module provided by the embodiment of the invention is large, the packaging method is simple and convenient, the reliability is high, and the purpose of industrial batch manufacturing can be achieved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A light module, characterized in that the light module comprises: wavelength division demultiplexing components, coupling components and detector chips; wherein the content of the first and second substances,
the wavelength division demultiplexing component is used for decomposing a received one-path wave combination parallel optical signal containing at least two wavelengths into at least two-path single-wave parallel optical signals;
the coupling component is used for carrying out focusing reflection processing on the at least two single-wave parallel optical signals and focusing the at least two single-wave parallel optical signals subjected to focusing reflection processing on a detector chip;
the detector chip is used for receiving the at least two paths of single-wave parallel optical signals and converting the at least two paths of single-wave parallel optical signals into electric signals.
2. The light module of claim 1,
the coupling assembly, comprising: the device comprises a first focusing lens, a second focusing lens and a reflecting prism;
the first focusing lens, the second focusing lens and the reflecting prism are in a first relative position; the first relative position is a position where an image formed by the focal point of the first focusing lens through the reflecting prism coincides with an image formed by the detector chip through the second focusing lens.
3. The light module of claim 2,
the first focusing lens is used for focusing the at least two single-wave parallel optical signals onto the reflecting prism;
the reflecting prism is used for reflecting the at least two paths of single-wave parallel optical signals to the second focusing lens;
the second focusing lens is used for focusing the at least two single-wave parallel optical signals onto the detector chip.
4. The light module of claim 2,
the first focusing lens and the second focusing lens respectively comprise a first surface and a second surface, and the first surface and the second surface are opposite surfaces; the first surface is a plane, and the second surface is a convex surface.
5. The light module of claim 3,
the focus of the first focusing lens is superposed with the light path focus point of at least two single-wave parallel optical signals which are processed by the focusing of the first focusing lens and reflected by the reflecting prism through the image formed by the reflecting prism.
6. The light module of claim 1, further comprising: a collimating lens;
the collimating lens is used for receiving a path of wave-combining optical signal containing at least two wavelengths, collimating the path of wave-combining optical signal containing at least two wavelengths into parallel light, obtaining a path of wave-combining parallel optical signal containing at least two wavelengths, and transmitting the path of wave-combining parallel optical signal containing at least two wavelengths.
7. The optical module of claim 6, wherein the collimating lens is in a second relative position to an optical port that emits a combined wave optical signal comprising at least two wavelengths; and the second relative position is a position where the focal point of the collimating lens coincides with the position of the optical center of the optical port.
8. The light module of claim 6, further comprising: a turning prism;
the turning prism is used for receiving the one-path wave-combination parallel optical signal containing at least two wavelengths after the collimation processing of the collimating lens, translating the one-path wave-combination parallel optical signal containing at least two wavelengths to a preset direction for a preset distance, and sending the one-path wave-combination parallel optical signal containing at least two wavelengths to the wavelength division demultiplexing component.
9. The optical module according to claim 2, wherein a focal point of the second focusing lens is located below an image formed by the focal point of the first focusing lens through the reflection prism.
10. The optical module of claim 2, wherein the number of channels of the first focusing lens and the second focusing lens is the same as the number of optical paths of the at least two single-wave parallel optical signals.
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| CN201910905022.5A CN110618504A (en) | 2019-09-24 | 2019-09-24 | Optical module |
| PCT/CN2019/124100 WO2021056832A1 (en) | 2019-09-24 | 2019-12-09 | Optical module |
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| CN201910905022.5A CN110618504A (en) | 2019-09-24 | 2019-09-24 | Optical module |
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| WO2021056832A1 (en) | 2021-04-01 |
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Application publication date: 20191227 |