WO2016199984A1

WO2016199984A1 - Wavelength multiplexing optical receiver modules

Info

Publication number: WO2016199984A1
Application number: PCT/KR2015/011471
Authority: WO
Inventors: 박기성; 이길동; 김석태; 박준희; 박호산
Original assignee: 주식회사 지피
Priority date: 2015-06-11
Filing date: 2015-10-29
Publication date: 2016-12-15
Also published as: JP2017529552A; KR20160145956A; JP6345809B2

Abstract

Disclosed in the present invention are various forms of wavelength multiplexing optical receiver modules. The present invention relates to a wavelength multiplexing optical receiver module for optical communication according to a wavelength division multiplexing (WDM) scheme, comprising: a parallel light receptacle portion comprising a receptacle coupled to an optical fiber connector, which is formed at an end-point terminal of an optical line, and a graded-index (GRIN) lens placed in a space inside the receptacle to convert inputted light into parallel light; a zigzag filter portion, which comprises a glass block having a parallelogram shape, a coating part formed on one side surface of the glass block, and a thin film filter formed on the opposite side surface of the glass block provided with the coating part, for separating optical signals from each wavelength; an optical package portion, which comprises an array lens positioned at the rear end of the zigzag filter portion to convert, into optical signals in a focused light form, optical signals in a parallel light form that are separated and by the zigzag filter portion and emitted therefrom, an array light detecting device arranged on the rear end of the array lens so as to be horizontal with respect to the optical signals in the parallel light form, for detecting electrical signals according to the optical signals from each wavelength that are emitted from the array lens, a reflective mirror for converting the direction of the focused light emitted from the array lens toward the array light detecting device, and a metal optical bench on the upper surface of which the zigzag filter portion, the array lens, the reflective mirror, and the array light detecting device are aligned and mounted; and a preamplifier device portion comprising a transfer impedance-type array preamplifier device for amplifying and outputting an electric signal detected by the light detecting device, an array preamplifier device submount where the array preamplifer device is mounted, and a module housing.

Description

Wavelength Multiplexed Optical Receive Module

The present invention relates to a wavelength multiplexed light receiving module, and more particularly, to a wavelength multiplexed light receiving module using a thin film filter.

As the demand for data gradually increases, the speed and capacity of optical communication are also rapidly increasing. An optical communication system having a transmission capacity of 10 Gbps or more using a single wavelength optical signal has already been commercialized and used. However, in recent metro and periodic transmission networks, a transmission capacity of 40 Gbps or 100 Gbps is required for one strand of optical fiber, and multiplexed optical signals of four different wavelengths having a transmission rate of 10 Gbps or 25 Gbps in one optical fiber are used to multiplex 40 Gbps or 100 Gbps. Optical communication using a wavelength division multiplexing (WDM) method for transmitting data is used.

In the optical division of the wavelength division multiplexing method, an optical transmission module for wavelength division multiplexing the laser light of four wavelengths and an optical signal transmitted through the optical path are demultiplexed into respective wavelengths and detected by the optical detection element as an electrical signal. The “wavelength division multiplexed optical reception module”, which amplifies the detected electrical signals, constitutes the most essential component of the optical communication system. The wavelength multiplexing optical reception module is a demultiplexing device for demultiplexing optical signals having different wavelengths by demultiplexing receptacles, optical coupling lenses, and optical signals received at optical fiber connectors located at the end of the optical path. And a photodetecting device for converting light separated at each wavelength into an electrical signal (photocurrent), and an amplifying device of a transfer impedance type for amplifying these electrical signals.

The wavelength multiplexing optical reception module is divided into two types according to the type of demultiplexing device as follows. The first type of wavelength division multiplexed photoreceiving module is a demultiplexing element as shown in FIG. 1, and uses an arrayed waveguide grating (AWG) element 14 to separate the multiplexed light into respective wavelengths. The optical signals according to the separated wavelengths are converted into electrical signals using the photodetector element 16 and the preamplifier element 18, and then amplified and output.

Specifically, in the wavelength multiplexed light receiving module using the array waveguide grating element 14 (hereinafter, abbreviated as 'light receiving module'), a part of the receptacle 11 into which the ferrule 12 is inserted is fastened with an optical fiber connector (not shown). When the multiplexed optical signal enters into the optical reception module, light is combined into the optical waveguide of the array waveguide grating element 14 using the aspherical lens 13, and the optical signal is generated in the array waveguide grating element 14. Separated by their respective wavelengths, they are emitted through their respective output ports.

Each wavelength output and emitted from the optical waveguide of the array waveguide grating element 14 is converged by the lens 15 into the light receiving region of the light detecting element 16 that is responsible for detecting each optical signal. 16) amplifies and outputs each signal from a plurality of preamplifiers 18 of a transfer impedance type connected by wire bonding (not shown) by placing the detected electrical signals according to the converged wavelengths.

In the conventional optical reception module of the first type, the biggest disadvantage is that a large optical loss occurs in the optical path until the optical signal input to the receptacle 11 is finally input to the photodetector 16. The optical loss occurs not only when the input light is input into the optical waveguide of the array waveguide grating element 14 using the aspherical lens 13 but also largely occurs inside the array waveguide grating element 14.

Therefore, in order to reduce the optical loss generated in the array waveguide grating element 14, the warpage of the optical waveguide from the common port of the input end of the array waveguide grating element 14 to the port of each wavelength of the output end should be minimized. In this case, the size of the array waveguide grating element 14 is increased, which causes a problem of increasing the size of the entire optical receiving module. Typically, in the case of the optical receiving module using the array waveguide grating element 14, the total optical insertion loss is large, usually 2 dB or more.

On the other hand, as another type of light receiving module as shown in Figure 2 as a demultiplexer for separating the wavelength of the multiplexed light into four wavelengths thin film filter (25-1 to 25-4 that passes only each wavelength) There is a light receiving module using).

In this case, the demultiplexing element including the thin film filters 25-1 to 25-4 is commonly referred to as a zigzag filter in the industry, and the zigzag filter is a glass block processed to have a predetermined angle as shown in FIG. 2A. The glass block 24 corresponding to the thin film filters 25-1 to 25-4 and the thin film filters 25-1 to 25-4 are formed on the side of the glass block 24 at predetermined intervals. It is composed of another reflective block 24-1 coated with a reflective film that is attached to the other side of the light, the light signals of each wavelength is reflected inside the zigzag filter, only the light of the corresponding wavelength thin film filter (25-1 ~ 25- It is a principle to get out through 4).

Briefly explaining the operation principle of the conventional optical receiving module 20 using the zigzag filter, the optical signal input through the ferrule 22 in the receptacle 21 is spread by the refractive index difference with the air, The optical signal is made into parallel light L by the aspherical lens 23.

When the parallel light L passes through the zigzag filter, it is separated into the optical signals of the respective wavelengths, and the optical signals of the respective wavelengths diverge and diverge into the focus light while passing through the array lens 26. The optical signal is reflected by the reflecting mirror 27 attached obliquely at 45 degrees and input to the light detecting element 28 horizontally attached on the metal optical bench 32.

The photodetector 28 is a plurality of preamplifiers 29 of a transfer impedance type connected by wire bonding (not shown) by placing electrical signals detected according to optical signals of respective wavelengths inputted at the rear ends thereof. It will be amplified and output.

Conventional optical receiving module 20 using the zigzag filter has an advantage that can significantly reduce the insertion loss of the optical signal compared to the optical receiving module 10 using the array waveguide grating element 14, the demultiplexing element itself Size also has the advantage of being smaller.

However, in the optical receiving module 20 using the thin film filters 25-1 to 25-4, the characteristics of the insertion loss and the band pass wavelength of the zigzag filter are greatly increased in the incident angle of the optical signal incident on the thin film filter as shown in FIG. 3. 3, the insertion loss of about 2dB occurs when there is a change in the incident angle of +/- 0.1 degrees in the thin film filter having an angle of incidence of light (AOI) of 10 degrees. The photodetector 28 has a disadvantage in that the deviation of the electrical signal measured according to the input accuracy of the focus light is severe.

Therefore, in order to minimize the insertion loss caused by the change of the incident angle into the thin film filter and the deviation of the electrical signal measured from the photodetecting device, the convex lens type injects divergent light into the zigzag filter as parallel light so as to minimize the change of the incident angle. Position and angle alignment of the array lens 26 to accurately enter the aspherical lens 23 and the parallel light separated by the respective wavelengths through the zigzag filter into the light receiving region of the photodetector 28 were very important. .

However, the alignment of the positions and angles of the aspherical lens 23 and the array lens 26 so far are aligned (actively aligned) by measuring the electric signals detected from the photodetecting element 28 by hand, respectively. In terms of time and input manpower, it was very inefficient, and as a result, the manufacturing cost increased and the productivity decreased significantly.

Accordingly, there is a need for a light receiving module having a new structure capable of solving the above problems and at the same time improving performance and productivity and minimizing the manufacturing cost and size.

The present invention is to solve the above-mentioned problems, in the implementation of the wavelength multiplexed light receiving module using a thin film filter, aspherical lens and array lens alignment on the metal optical bench can be made easily, An object of the present invention is to provide a wavelength multiplexing light receiving module capable of reducing the number, size, manufacturing process, and manufacturing cost of modules.

According to an aspect of the present invention, a wavelength multiplexing optical reception module for optical communication using a wavelength division multiplexing (WDM) method, comprising: a receptacle coupled to an optical fiber connector formed at an end of a light path, and positioned in an inner space of the receptacle; A parallel light receptacle unit configured to form a hill-type refractive index lens GRIN LENS configured to convert the input light into parallel light; A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part; An array lens disposed at a rear end of the zigzag filter unit for converting an optical signal in the form of parallel light separated from the zigzag filter unit into an optical signal in the form of a focus light, and in the rear end of the array lens; An array photodetector for detecting an electrical signal corresponding to an optical signal for each wavelength emitted from the array lens and disposed horizontally with an optical signal, and a reflection mirror for converting a direction of focus light emitted from the array lens toward the array photodetector side And an optical package part including a zigzag filter part, an array lens, a reflecting mirror, and a metal optical bench mounted on the upper surface to align and mount the photodetecting device. And a preamplifying device unit comprising an array preamplifying device of a transfer impedance type for amplifying and outputting an electric signal detected by the photodetecting device, an array preamplifying device sub-mount on which the array preamplifying device is mounted, and a module housing; A wavelength multiplexed light receiving module may be provided.

According to another aspect of the present invention, a wavelength multiplexing optical reception module for optical division of the wavelength division multiplexing (WDM) method, comprising: a receptacle coupled to an optical fiber connector formed at an end of a light path, and an internal space of the receptacle; A parallel light receptacle unit positioned to form a hill-shaped refractive index lens (GRIN LENS) for converting input light into parallel light; A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part; An array lens disposed at a rear end of the zigzag filter unit for converting an optical signal in the form of parallel light separated from the zigzag filter unit into an optical signal in the form of a focus light, and in the rear end of the array lens; An array photodetector for detecting an electrical signal according to the focus light emitted from the array lens and disposed perpendicular to the optical signal, an array photodetector submount to which the array photodetector is vertically attached, and the zigzag on an upper surface An optical package unit configured of a filter unit, a metal optical bench on which the array lens, the array photodetector element, and the array photodetector submount are mounted and aligned; And a preamplifier element comprising an array preamplifier of a transfer impedance type for amplifying and outputting an electric signal detected by the photodetector, and an array preamplifier submount and module housing on which the array preamplifier is mounted. Wavelength multiplexed light receiving module comprising; may be provided.

According to still another embodiment of the present invention, a wavelength multiplexing optical reception module for optical communication using a wavelength division multiplexing (WDM) method includes: a receptacle coupled to an optical fiber connector formed at an end of a light path and an inside of the receptacle; A parallel light receptacle unit positioned in a space and configured to have a hill-shaped refractive index lens GRIN LENS configured to convert input light into parallel light; A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part; A reflection mirror for vertically refracting the optical signal in the form of parallel light separated from the zigzag filter unit in a downward direction; and parallel light reflected by the reflection mirror in parallel with the reflection mirror under the reflection mirror. An array lens for converting an optical signal in the form of a focus light into an optical signal in the form of a focus light, and an electrical signal according to the optical signal in the form of a focus light emitted from the array lens in parallel with the array lens below the array lens. An array optical detection element for detecting, and the zigzag filter unit is mounted on the upper surface and aligned, and the reflective mirror, the array lens, the array optical detection element to be placed and aligned in parallel with each other at a predetermined interval to the metal optical bench An optical package unit configured; And a preamplifying device unit comprising an array preamplifying device of a transfer impedance type for amplifying and outputting an electric signal detected by the photodetecting device, an array preamplifying device sub-mount on which the array preamplifying device is mounted, and a module housing; A wavelength multiplexed light receiving module may be provided.

The wavelength multiplexed light receiving module according to various embodiments of the present invention can minimize the active alignment process of manufacturing the light receiving module, and as the light receiving module is manufactured by assembling and forming a plurality of individual assembly types individually The overall module productivity (manufacturing yield) can be improved.

In addition, it is possible to mass-produce optical receiver modules with excellent characteristics at a low price while improving manufacturing yield, and to reduce the price of optical transceivers that use optical receiver modules as important components, thereby ultimately activating the optical receiver module market and wavelength multiplexing. Technology can greatly contribute to increasing data transmission capacity of optical communication.

1 is a plan view illustrating a wavelength division multiplexing optical reception module using a conventional arrayed waveguide grating (AWG) device.

2 is a plan view and a cross-sectional view showing a wavelength division multiplexed light receiving module using a conventional thin film filter.

FIG. 3 is a graph showing an insertion loss curve according to an incident angle of light of a band pass filter of the wavelength division multiplexed light receiving module using the thin film filter of FIG. 2.

4 is a plan view and a cross-sectional view showing a wavelength division multiplexed light receiving module according to an embodiment of the present invention.

5 is a cross-sectional view illustrating a state in which a silicon V-groove reflection mirror is applied to the optical package of FIG. 4.

6 is an assembly explanatory diagram for explaining an assembly process of the wavelength division multiplexed light receiving module of FIG. 1.

7 is a cross-sectional view illustrating a wavelength division multiplexing light receiving module according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a lens integrated photodetector applied to the optical package unit of FIG. 7.

9 is a plan view and a cross-sectional view illustrating a parallel light receptacle unit and an optical package unit of a wavelength division multiplexed light receiving module according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention can be fully conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. In addition, the same reference numerals may indicate the same components throughout the specification.

4 is a plan view and a cross-sectional view showing a wavelength division multiplexed light receiving module according to an embodiment of the present invention. 5 is a cross-sectional view illustrating a state in which a silicon V-groove reflection mirror is applied to the optical package of FIG. 4.

First, referring to FIG. 4, the wavelength multiplexed light receiving module (hereinafter, abbreviated as “light receiving module”) according to an embodiment of the present invention includes a parallel light receptacle unit 110, a zigzag filter unit 120, The optical package 130 and the preamplifier device 140 are configured.

The parallel light receptacle unit 110 is a configuration for connecting an optical connector (not shown) positioned at an end of a light path and a light receiving module, and includes a cylindrical receptacle 111, a ferrule 112 located inside the receptacle, and a receptacle ( 111 and a cylindrical sleeve 113 positioned between the ferrule 112 and a hill-shaped refractive index lens (GRIN Lens) 114 located inside the rear end receptacle 111 of the ferrule 112. In this case, the ferrule 112, the sleeve 113, and the hill-shaped refractive index lens 114 have the same central axis in the receptacle 111.

The parallel light receptacle unit 110 is characterized in that the insertion of the hill-type refractive index lens 114 in addition to the conventional receptacle portion consisting of only the ferrule and the sleeve, wherein, the ferrule 112 and the hill-type refractive index lens ( 114 may be machined on one surface facing each other. The hill-shaped refractive index lens 114 converts the diffused light emitted through the ferrule 112 into parallel light. The hilly refractive index lens 114 is designed according to the desired refractive index lens 114 because the position of the focal length for making perfect parallel light is determined by the length of the hilly refractive index lens 114. And ease of manufacture can be increased. In addition, the hill-type refractive index lens 114 has a structure that is inserted into the receptacle 111 without a separate alignment process with the ferrule 122 of the same cylindrical structure inside the receptacle 111 having a cylindrical structure, so that only mechanical precision Only the process of fixing in the correct position is required, which makes it possible to produce relatively perfect parallel light without separate active alignment.

As described above, the parallel light receptacle unit 110 includes an aspherical convex lens configured to make parallel light in a conventional light receiving module, and an aspherical surface while measuring the photocurrent of the photodetecting device to position the aspherical convex lens at an accurate focal length. By using an active alignment method to find and fix the position of the convex lens, an increase in complexity of the assembly process and a decrease in manufacturing yield may be solved.

The zig-zag filter unit 120 is a demultiplexing element for separating optical signals for each wavelength, and is formed at a constant interval on one side of the glass block 123 having a parallelogram shape and at one side of the glass block 123. It may be configured to include a thin film filter (124-x: 124-1 ~ 124-4) for passing the optical signal. In this case, the

coating parts

121 and 122 may be formed on the other side of the glass block 123 on which the thin film filters 124-x 124-1 to 124-4 are formed.

The

coating parts

121 and 122 are formed in the remaining areas except for the anti-reflective coating 121 formed in a predetermined area corresponding to the area where the optical signal is incident through the hill-type refractive index lens 114 and the non-reflective coating. The reflective film 122 may be formed to be divided.

At this time, the anti-reflective coating 121 formed on one side of the glass block 123 serves to minimize the loss due to the reflection of the optical signal incident through the hill-shaped refractive index lens 114 to the glass block 123, The reflective coating 122 serves to cause the optical signal returned from the thin film filter 124-1 formed on the opposite side to be reflected again and then incident to the thin film filters 124-2 to 124-4.

The zigzag filter unit 120 is first coated with a non-film coating 121 on a portion of one side of the glass plate having a predetermined refractive index and thickness, and then the reflecting film coating 122 on another area of the same surface and cut out to have a predetermined size. Next, the cut glass block is polished at a precise angle so that its cross section is in the form of a parallelogram, and then the prefabricated thin film filters 124-x: 124-1 to 124-4 are formed with a coating of the glass block 123. It may be produced through a process of attaching sequentially to a predetermined position on the other side corresponding to the side.

The zigzag filter unit 120 according to this type of structure and manufacturing process reduces the number of parts required and also simplifies the assembly process compared to the conventional structure having a form of attaching to the side of the glass block by manufacturing a separate reflective film, thereby simplifying the zigzag filter unit. The manufacturing cost can be lowered.

The optical package unit 130 may include an array lens 131, a reflective mirror 132, an array photodetector 133, and a metal optical bench 134.

In this case, the array lens 131 is an integrated lens for converting divergent light into a focus light, the array photodetecting device 133 is an integrated photodetector in one component, its role is conventional May be similar to

The reflective mirror 132 is configured to refract the focus light emitted by the array lens 131 to the array photodetecting element 133 by being positioned on the upper side of the array photodetecting element 133. It consists of a coated rod-shaped mirror and can be positioned at an angle (about 45 degrees).

The metal optical bench 134 is a component in which the zigzag filter unit 120, the array lens 131, the reflection mirror 132, and the array photodetector 133 are seated and fixed, and each component is seated and aligned. The alignment groove 135 and the seating portion 135a may be formed to be fixed. In detail, an alignment groove of a shape corresponding to the glass block 123, the array lens 131, and the array photodetecting element 133 of the zigzag filter unit 120 may be formed on the upper side of the metal optical bench 134. have. In addition, a mounting portion 135a may be formed to protrude from the upper side of the array photodetector 133 so that the reflective mirror 132 may be inclined at a predetermined angle.

The metal optical bench 134 in which the alignment groove 135 and the mounting portion 135a are machined for the alignment and seating of the respective components is adapted to the conventional active alignment in the case of the respective components, especially the array lens 131. It is possible to align the position of each component with only mechanical precision without the need to perform, and in the case of the reflective mirror 132, there is no need to provide a separate component for angle adjustment, mounting, thereby reducing the manufacturing process time and cost By reducing the production efficiency can be improved. In addition, as the components are aligned and seated in the alignment groove 135 and the seating portion 135a of the metal optical bench 134, damage of the components due to external force and deformation of the alignment state are prevented, thereby improving mechanical durability of the optical package portion. Can be.

The preamplification element unit 140 includes an array preamplification element 141 and an array preamplification element 141 in which the optical reception module housing 141 and the transfer impedance type preamplification (TIA) elements are integrated into one configuration. And an array preamplifier element submount 143 to be seated.

5 is a cross-sectional view illustrating a state in which a V-groove-etched silicon semiconductor is applied to the optical package of FIG. 4.

Meanwhile, as shown in FIG. 5, the silicon V instead of the flat reflective mirror 136 for refracting the focus light emitted by the array lens 131 to the optical package portion is located below the array photodetecting element 133. Groove reflection mirror 136 may be configured. The silicon V-groove reflecting mirror 136 is a V-groove on the silicon semiconductor and the reflective film is coated on the etched inclined surface, the silicon V-groove reflecting mirror 136 is a conventional flat reflection mirror 132 Compared to using the reflective mirror 136, the cost of the optical package unit 130 can be reduced more effectively.

However, when the light is folded to the array photodetector 133 using the silicon V-groove reflection mirror 136, the reflection angle is about 45 degrees, which is the angle of the inclined surface that appears during wet etching of silicon. . In this case, although the light incident on the array photodetector 133 is incident to about 80.3 degrees instead of 90 degrees, this can be adjusted according to the position of the reflecting mirror, thus having a large influence (or change) on the output photocurrent value ( A) none.

The parallel light receptacle unit 110, the zigzag filter unit 120, the optical package unit 130, and the preamplification element unit 140 constituting the light receiving module according to an embodiment of the present invention are manufactured in separate assemblies, respectively. And assembling is possible, these assembling process will be described with reference to FIG.

First, the assembling step-1 process of attaching the zigzag filter unit 120 to a predetermined position of the optical package unit 130 is performed. At this time, when performing the assembly step-1 process, the distance between the zigzag filter unit 120 and the array lens 131 does not affect the characteristics of the module, but the twisted degree of the zigzag filter unit 120 greatly affects the optical loss and wavelength characteristics. Will be affected. On the other hand, the metal optical bench 134 according to the present invention, as the alignment groove 315 is formed, the zigzag filter unit 120 just by mounting the zigzag filter unit 120 in the alignment groove 315 The assembly can be made in a state where the twist of the minimization is minimized.

In the assembling step-1, the assembling step-2 process of attaching the optical package unit 130 in which the zigzag filter unit 120 is assembled to a predetermined position in the preamplifier element unit 140 is performed. The accuracy of this assembly process does not affect the optical properties of the light-receiving module, so precise positioning accuracy is not required. In addition, the array photodetector element of the optical package unit 130 assembled in the preamplifier element 140 is connected to the array preamplifier 142 of the preamplifier element 140 by wire bonding. Phase omitted).

Lastly, the assembling step of assembling the parallel light receptacle unit 110 to the assembly in which the zigzag filter unit 120, the optical package unit 130, and the preamplification element unit 140 completed by the assembling step-2 are assembled. -3 process is performed. In this assembling process, while receiving light through the receptacle of the parallel light receptacle unit 110, the parallel light receptacle is read at a position where the maximum electric signal value can be obtained while reading the output electric signal (photocurrent) value of the corresponding array photodetecting device. It must be assembled in an active alignment manner to fix the portion (110). At this time, the electrical signal values of at least two array photodetectors must be actively aligned so that the values exceed a predetermined reference value. The light path of the parallel light L has the shortest photodetector and the longest photodetector (ex: 124-). It may be effective to align while measuring the electrical signal values of 1, 124-4.

Hereinafter, a wavelength division multiplexing optical reception module according to another embodiment of the present invention will be described.

7 is a cross-sectional view illustrating a wavelength division multiplexing light receiving module according to another embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating a lens integrated photodetector applied to the optical package unit of FIG. 7.

Referring to FIG. 7, in the light receiving module according to another embodiment of the present invention, the array photodetecting device 133, which is one of the components constituting the optical package unit 130, is formed of metal optics in contrast to an embodiment of the present invention. It is characterized in that it is attached to the array photodetector submount 237 perpendicular to the top of the bench 234, rather than attached to the upper surface of the bench 234. According to this structure, it is not necessary to refract the direction of the light incident on the array photodetector 233, such as the reflective mirror 132 or the silicon V-groove reflective mirror 136, which is configured in the optical package part of the embodiment. Components may be eliminated, allowing for the manufacture of more compact light receiving modules.

On the other hand, it is characterized in that using the lens integrated photodetector 238, the array photodetection element 233 of the optical reception module according to another embodiment of the present invention shown in FIG. Lens integrated photodetector 238 is a lens integrally modularized on the back of the light-receiving area of the light-detecting device, if the light is input to the light-receiving area through the front of the existing photodetecting device, the lens integrated photodetecting device is The light input through the lens is input to the light receiving area through the back of the photodetecting device.

In this way, since the optical package unit 230 using the lens integrated photodetector element 238 is not required, an array lens for converting the parallel light L passing through the zigzag filter unit 220 into the focus light is not required. Simplify the process and reduce the size of the fabrication module.

9 is a plan view and a cross-sectional view illustrating a parallel light receptacle unit 320 and an optical package unit 330 of a wavelength division multiplexed light receiving module according to another embodiment of the present invention.

Referring to FIG. 9, the optical receiving module according to another embodiment of the present invention has a difference in the optical package unit compared to the optical receiving module according to the exemplary embodiment described above, and thus, regarding the optical package unit 330. I will explain only.

According to another embodiment of the present invention, the optical package unit 330 includes an array lens 331 positioned between the zigzag filter unit 320 and the reflective mirror 333, and the reflective mirror 332 and the array photodetector device ( 333) is moved to position between them. At this time, the array lens 331 is placed in parallel with the array photodetector element 333 in the same line in the vertical direction.

In addition, the distance between the array lens 331 and the array photodetection element 333 is located at a predetermined position on both edges of the metal optical bench 334 such that the array photodetection element 333 is positioned at the focal length of the array lens 331. The jaws are made to align the array lens 331. This may correspond to the seating portion described in the embodiment.

The optical reception module according to various embodiments of the present invention as described above can minimize the active alignment process of manufacturing the optical reception module, and the optical reception module is formed by separately manufacturing and assembling a plurality of individual assembly configurations. This can improve overall module productivity (manufacturing yield).

In addition, the module can be miniaturized, and the components can be reduced, thereby reducing the manufacturing process and manufacturing cost, thereby reducing the price of the optical transceiver using the optical receiving module as an important component. Using wavelength multiplexing technology can greatly contribute to increasing data transmission capacity of optical communication.

* The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those of ordinary skill in the art to which the present invention pertains. Not limited by the drawings, all or some of the embodiments may be selectively combined to enable various modifications.

Claims

In the wavelength multiplexed optical reception module for wavelength division multiplexing (WDM) optical communication,

A parallel light receptacle unit including a receptacle coupled to an optical fiber connector formed at an end of a light path, and a hill-type refractive index lens (GRIN LENS) positioned in an inner space of the receptacle to convert input light into parallel light;

A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part;

An array lens disposed at a rear end of the zigzag filter unit for converting an optical signal in the form of parallel light separated from the zigzag filter unit into an optical signal in the form of a focus light, and in the rear end of the array lens; An array photodetector for detecting an electrical signal corresponding to an optical signal for each wavelength emitted from the array lens and disposed horizontally with an optical signal, and a reflection mirror for converting a direction of focus light emitted from the array lens toward the array photodetector side And an optical package part including a zigzag filter part, an array lens, a reflecting mirror, and a metal optical bench mounted on the upper surface to align and mount the photodetecting device. And

A preamplifier element comprising an array preamplifier of a transfer impedance type for amplifying and outputting an electrical signal detected by the photodetector, an array preamplifier for mounting the array preamplifier, and a module housing; Wavelength multiplexed light receiving module comprising.
In the wavelength multiplexed optical reception module for wavelength division multiplexing (WDM) optical communication,

A parallel light receptacle unit including a receptacle coupled to an optical fiber connector formed at an end of a light path, and a hill-type refractive index lens (GRIN LENS) positioned in an inner space of the receptacle to convert input light into parallel light;

A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part;

An array lens disposed at a rear end of the zigzag filter unit for converting an optical signal in the form of parallel light separated from the zigzag filter unit into an optical signal in the form of a focus light, and in the rear end of the array lens; An array photodetector for detecting an electrical signal according to the focus light emitted from the array lens and disposed perpendicular to the optical signal, an array photodetector submount to which the array photodetector is vertically attached, and the zigzag on an upper surface An optical package unit configured of a filter unit, a metal optical bench on which the array lens, the array photodetector element, and the array photodetector submount are mounted and aligned; And

A preamplifying element unit comprising an array preamplifying element of a transfer impedance type for amplifying and outputting an electric signal detected by the photodetecting element, an array preamplifying element submount on which the array preamplifying element is mounted, and a module housing; Wavelength multiplexed light receiving module comprising a.
In the wavelength multiplexed optical reception module for wavelength division multiplexing (WDM) optical communication,

A parallel light receptacle unit including a receptacle coupled to an optical fiber connector formed at an end of a light path, and a hill-type refractive index lens (GRIN LENS) positioned in an inner space of the receptacle to convert input light into parallel light;

A glass block having a parallelogram shape, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed, and thus a zigzag filter for separating an optical signal for each wavelength. part;

A reflection mirror for vertically refracting the optical signal in the form of parallel light separated from the zigzag filter unit in a downward direction; and parallel light reflected by the reflection mirror in parallel with the reflection mirror under the reflection mirror. An array lens for converting an optical signal in the form of a focus light into an optical signal in the form of a focus light, and an electrical signal according to the optical signal in the form of a focus light emitted from the array lens in parallel with the array lens below the array lens. An array optical detection element for detecting, and the zigzag filter unit is mounted on the upper surface and aligned, and the reflective mirror, the array lens, the array optical detection element to be placed and aligned in parallel with each other at a predetermined interval to the metal optical bench An optical package unit configured; And

A preamplifier element comprising an array preamplifier of a transfer impedance type for amplifying and outputting an electrical signal detected by the photodetector, an array preamplifier for mounting the array preamplifier, and a module housing; Wavelength multiplexed light receiving module comprising.
The method according to any one of claims 1 to 3,

The parallel light receptacle unit further includes a closed rule positioned in the receptacle inner space on the front side of the hill-shaped refractive index lens, and a cylindrical sleeve disposed between the closed rule and the receptacle, the inner space of the receptacle and the hill refractive index lens. Wherein the closure rule and the sleeve are all positioned to have the same central axis.
The method according to any one of claims 1 to 3,

The coating part is formed on one side of the glass block located at the rear end of the hill-shaped refractive index lens, the anti-reflective coating is formed in a predetermined area where light is input from the hill-shaped refractive index lens, and the anti-reflective coating is formed Wavelength multiplexed light receiving module formed by dividing the reflective film formed in the remaining area except for.
The method according to claim 1,

The reflective mirror is a wavelength multiplexed light receiving module formed of any one of a reflective mirror coated with a reflective film on one surface or a silicon V-groove reflective mirror which is etched with a V-groove on a silicon semiconductor and coated with a reflective film on the etched inclined surface. .
The method according to claim 2,

And the array photodetector is formed of a lens integrated photodetector in which a lens for converting an optical signal in parallel light into an optical signal in focus light is formed integrally with the photodetector.
The method according to any one of claims 1 to 3,

The zigzag filter unit, the array lens, the array photodetection element, and an alignment groove portion or a seating portion formed of a protruding inclined surface or a multi-layer jaw are respectively formed on the metal optical bench to partially insert and align the reflective mirror. Wavelength multiplexed light receiving module.
The method according to any one of claims 1 to 3,

And said parallel light receptacle portion, said zigzag filter portion, said optical package portion and said preamplification element portion are separately manufactured and formed by assembling them together.
The method of claim 9,

And the parallel light receptacle unit is assembled (formed) outwardly away from the center of one surface of the module housing of the preamplification element unit.
The method of claim 10,

When the parallel light receptacle unit is assembled to one surface of the module housing of the preamplifier device unit, the parallel light receptacle unit reads the output electric signal value of the array photodetector element according to the light input through the parallel light receptacle unit to obtain a maximum electric signal value. A wavelength multiplexing light receiving module assembled through an active alignment method of fixing parallel light receptacles.