JP3719651B2 - Multi-channel optical module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical signal transmission and optical signal processing module which is a component of an optical communication network, or an optical signal transmission multi-channel optical module for connecting information processing apparatuses between optical signals.
[0002]
[Prior art]
In a multichannel optical module having at least two optical signal channels, an optical connection between an optical fiber and an optical functional element or an optical waveguide is a microlens array in which small lenses having the same number as the number of channels are arrayed. In general, a method is used in which linear spherical fibers having a lens effect are arranged in an array and the optical fiber is optically coupled to an optical functional element or an optical waveguide. As a simpler technique, multi-channel collective coupling using one large lens has been attempted.
[0003]
[Problems to be solved by the invention]
Among the methods described above, in the method using a microlens array or a line ball fiber array, it is necessary to make the pitch between channels of the optical functional element or the optical waveguide coincide with the fiber pitch of the optical fiber ribbon (for example, 250 μm). . Therefore, narrowing the pitch for further miniaturization and higher integration of semiconductor optical devices and waveguides, and widening the pitch of semiconductor optical devices for reducing electrical stroke during high-speed signal transmission have been hindered. Furthermore, there is a problem that the inter-channel deviation occurs in the optical coupling characteristics due to the variation in the lens characteristics of the microlens array and the linear ball fiber array, resulting in deterioration of module characteristics and yield reduction.
[0004]
On the other hand, in the case of multi-channel collective optical coupling using a large lens, there has been a problem that the optical characteristics of the lens change with the deviation from the central axis of the lens, resulting in an inter-channel deviation in coupling efficiency. In addition, there is a problem in that it is necessary to design and manufacture a larger lens in order to cope with the increase in the pitch of the semiconductor optical device and the increase in the number of channels in order to reduce electrical crosstalk accompanying the increase in speed. In particular, it is difficult to achieve both the enlargement of the lens and the uniformity of the optical characteristics within the lens surface, resulting in a decrease in lens yield and an increase in cost.
[0005]
The present invention has been made in view of the above situation, and realizes simple multi-channel collective optical coupling including pitch conversion between an optical functional element and an optical fiber, and is flexible in increasing the number of channels and increasing the pitch of semiconductor optical elements. The purpose is to provide a multi-channel optical module that suppresses the complexity and cost increase of the manufacturing process by promoting miniaturization and high speed.
[0006]
Multi-channel optical module of the present invention for achieving the above object, in a multi-channel optical module for optical coupling an array optical element and the array-shaped optical fiber via a lens system,
An aspheric lens having a stable optical characteristic by providing a pitch converting array waveguide between the lens system and the arrayed optical fiber, and disposing an aspheric lens between the lens system and the array waveguide. An image is formed on the corresponding arrayed waveguide or core using the central region of the optical system, and the lens system and the arrayed optical fiber are optically coupled via the pitch converting array waveguide by a simple optical coupling system. It is characterized by performing multi- channel batch connection.
[0007]
Further, the multi-channel optical module of the present invention for achieving the above object, in a multi-channel optical module for optical coupling an array optical element and the array-shaped optical fiber via a lens system,
Said lens system and provided with pitch conversion array waveguide between the array optical element, arranged aspheric lens between the arrayed waveguide and the lens system, non having stable optical characteristics focused on the array waveguide or core portion corresponding with the central region of the spherical lens, by simple optical coupling system, the array optical element and the lens system through the 該Pi pitch conversion array waveguide It is characterized by performing multi- channel simultaneous connection by optical coupling.
[0008]
Further, the multi-channel optical module of the present invention for achieving the above object, in a multi-channel optical module for optical coupling an array optical element and the array-shaped optical fiber via a lens system,
An aspheric lens having a stable optical characteristic by providing a pitch converting array waveguide between the lens system and the arrayed optical fiber, and disposing an aspheric lens between the lens system and the array waveguide. An image is formed on the corresponding arrayed waveguide or core using the central region of the optical system, and the lens system and the arrayed optical fiber are optically coupled via the pitch converting array waveguide by a simple optical coupling system. While performing multi- channel batch connection,
A second pitch converting array waveguide is provided between the lens system and the arrayed optical element, and an aspherical lens is disposed between the lens system and the arrayed waveguide so as to have stable optical characteristics. The center region of the spherical lens is used to form an image on the corresponding arrayed waveguide or core, and the lens system and the arrayed optical element are connected via the second pitch conversion arrayed waveguide by a simple optical coupling system. It is characterized by performing multi- channel simultaneous connection by optical coupling.
In the multi- channel optical module according to any one of claims 1 to 3, the waveguide is provided with a spot size conversion unit.
[0009]
In other words, in the present invention, between the optical functional element array and the optical fiber array or the array optical waveguide with the pitch converter, or between the optical functional element array with the pitch converter and the optical fiber array or the array optical waveguide. Or one general-purpose small aspherical lens used in a one-channel optical element module between an optical functional element array with a pitch converter and an optical fiber array or array optical waveguide with a pitch converter. The optical input / output unit of a multi-channel optical element narrowed by the pitch converter unit is connected to the corresponding array optical waveguide or the core unit of the optical fiber array using the central region of the aspherical lens having stable optical characteristics. And realize multi-channel batch connection with a simple optical coupling system.
[0010]
In this optical coupling system, the optical function element array or the optical fiber array, or the pitch conversion unit provided in the optical function element array and the optical fiber array, the light of the optical function element array is sized to fit the numerical aperture of the lens to be used. By changing the size of the input / output unit, it is possible to cope with the downsizing of the optical module, the increase in the number of channels, and the increase in the pitch for stroke reduction without increasing the size of the lens or adjusting the numerical aperture. As a result, it is possible to avoid the complexity of the assembling process of the multi-channel optical module and the high cost due to the production of the dedicated lens, and it is possible to obtain a multi-channel optical module that can easily realize a reduction in size and cost.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 illustrates the structure of subcarriers of the multichannel optical module according to the first embodiment of the present invention, FIG. 2 illustrates the optical coupling state of subcarriers, FIG. 3 illustrates the comparison between the effective aperture and the laser beam, FIG. 4 is a graph showing coupling loss, and FIG. 5 is a diagram illustrating the overall configuration of the multichannel optical module according to the first embodiment.
[0012]
In this embodiment, for example, an 8-channel semiconductor laser diode (LD) array as an arrayed optical element provided with a waveguide (second pitch converting array waveguide) for converting the pitch between arrays from 250 μm to 75 μm, Optical coupling between an 8-channel optical fiber array (250 μm pitch) as an arrayed optical fiber having a waveguide array (pitch conversion array waveguide) that converts the pitch between arrays from, for example, 250 μm to 150 μm Is described with reference to an example of a multi-channel optical module realized by a single aspherical lens having a magnification of 2 ×.
[0013]
The subcarrier will be described with reference to FIG.
[0014]
The subcarrier 1 is configured by mounting each component on a CuW block (block) 2 made of copper / tungsten alloy subjected to gold plating in the following procedure. 8ch semiconductor laser diode array (LD array) 3 (pitch between channels of output part 75 μm) with pitch conversion waveguide (second pitch conversion array waveguide), PD 4 for power monitor and thermistor 5 for temperature control are made of AlN The wiring board 6 is mounted on the wiring board 6 and is electrically connected by wire bonding or the like. The wiring board 6 and the block 2 are soldered together. Subsequently, an aspherical lens with a magnification of 2 times as a lens system (with stainless steel holder, optical characteristics are effective N / A: 0.6, f = 1.5 mm) equivalent to that of a general-purpose product is placed in the lens mounting groove of block 2 Put.
[0015]
Further, an 8ch optical fiber array (optical fiber array) 9 with a pitch conversion waveguide (pitch conversion array waveguide) whose tip is covered with a stainless steel block 8 is placed on the fiber fixing portion of the block 2. Finely adjust the position of the aspherical lens 7 and the stainless steel block 8 on the block 2, find the position where the 8ch emitted light from the LD array 3 is combined with the optical fiber array 9, and perform the YAG welding to the aspherical lens 7 and the stainless steel block. 8 is fixed in that position.
[0016]
The optical coupling will be described with reference to FIGS.
[0017]
In the actual optical coupling state, the distance between the LD array 3 and the aspherical lens 7 is about a mm (for example, 0.7 mm), and the distance between the aspherical lens 7 and the optical fiber array 9 is about bmm (for example, 4.5 mm). It has become. The central axes of the LD array 3, the aspheric lens 7 and the optical fiber array 9 are substantially coincident. At this time, since the pitch between channels of the output part of the LD array 3 is 75 μm, the emission center of the laser light is ± 37.5 μm (ch4,5) and ± 112.5 μm (ch3,6) from the central axis of the aspherical lens 7. , ± 187.5 μm (ch2,7), ± 262.5 μm (ch1,8). Further, since the spot size conversion unit is provided in the waveguide, the beam divergence angle is 15 ° in both the direction perpendicular to and parallel to the paper surface in FIG. Therefore, the beam emitted from the end face of the LD array 3 has a circular shape with a diameter of 190 μm (vertical direction) when entering the aspherical lens 7 separated by 0.7 mm, for example.
[0018]
Four circular beams from the LD array 3 and a circle having a radius of 525 μm (N / A: 0.6 and a distance 0.7 mm between the LD array 3 and the aspheric lens 7), which is an effective aperture of the aspheric lens 7. FIG. 3 shows the comparison. As can be seen from the figure, all of the eight beams are incident on the effective aperture of the aspheric lens 7, and as shown in FIG. 2, the emitted light is emitted from the optical fiber array 9 having a pitch twice that of the LD array 3. The image is formed on the end face. The deviation of the incident angle from the vertical incidence of the eight beams into the optical fiber is at most 10 ° (ch1,8), and the influence of this angular deviation on the coupling efficiency is negligible. FIG. 4 shows the insertion loss of the LD array 3 and the optical fiber array 9 actually measured after the subcarrier 1 is completed. As can be seen from the figure, all 8 channels are coupled with a loss of 4 dB to 5 dB, and the same result as that obtained when the tip-end fibers are aligned one by one is obtained.
[0019]
The module fabrication will be described with reference to FIG.
[0020]
As shown in the figure, a Peltier element 12 and a subcarrier 1 are placed and fixed in this order in a module case 11 with terminals for power supply, electrical signal, APC control and temperature control. Thereafter, connection between the electrical terminals of the subcarrier 1 and the module case 11 is performed. Subsequently, the MT ferrule part 10 of the optical fiber array 9 is sealed and fixed to the module case 11 with an epoxy adhesive. Finally, a metal lid 13 is seam welded to the module case 11 in a nitrogen atmosphere to complete the module. The completed module has been confirmed to exhibit the same transmission characteristics as a module using a tip fiber or microlens.
[0021]
The multi-channel optical module according to the above-described embodiment uses an optical coupling structure including pitch conversion between the optical functional element and the optical fiber, so that a small and low-cost multi-channel by a single general-purpose aspheric lens 7 is used. Batch join can be realized. It is also possible to employ a configuration in which the pitch converting array waveguide is provided only between the optical functional element and the aspherical lens 7.
[0022]
A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 illustrates the subcarrier structure of the multichannel optical module according to the second embodiment of the present invention, FIG. 7 illustrates the overall configuration of the multichannel optical module according to the second embodiment, and FIG. 8 illustrates the coupling. A graph representing the loss is shown.
[0023]
In this embodiment, in order to reduce the electric stroke during high-frequency driving, the pitch between channels is increased to, for example, 500 μm, and the pitch is converted to be reduced to, for example, 100 μm (second pitch). 4ch semiconductor laser diode (LD) array light source as an arrayed optical element provided with an array waveguide for conversion) and an optical waveguide array for converting the pitch between channels so as to be narrowed to 200 μm, for example (array converter for pitch conversion). Optical coupling between a 4ch optical fiber array as an arrayed optical fiber provided with a waveguide) is realized by an optical coupling system comprising one laser collimating lens, one optical isolator, and one fiber collimating lens. The configuration, operation, and effects are described by taking a multi-channel optical module as an example.
[0024]
The subcarrier will be described with reference to FIG.
[0025]
The subcarrier 21 is configured by mounting each component on a CuW block (block) 22 made of copper / tungsten alloy subjected to gold plating in the following procedure. For example, a 4ch semiconductor laser diode (LD) array (LD array) 23 (an output channel pitch of 500 μm) with an array waveguide of 100 μm pitch (second pitch conversion array waveguide) is an AlN wiring. Flip chip bonding is performed at a predetermined position on the high-frequency signal line formed on the plate 24. Thereafter, the power monitor PD 25 and the temperature control thermistor 26 are mounted on the wiring board 24 and are electrically connected by wire bonding or the like.
[0026]
Subsequently, for example, an aspherical laser diode (LD) collimating lens (LD collimating lens) 27 (with a stainless steel holder) having a focal length of 1.6 mm and an N / A of 0.6 is placed in the lens mounting groove of the block 22. The position of the LD collimating lens 27 is set so that the distance c between the LD array 23 and the LD collimating lens 27 is equal to the focal length (for example, 1.6 mm). Thereafter, the position of the LD collimating lens 27 is adjusted and fixed by YAG welding so that collimated light parallel to the optical axis is obtained.
[0027]
Similarly to the first embodiment, the divergence angle of the beam from the LD array 23 of this embodiment is 15 ° in both the horizontal direction and the vertical direction, and the signal light is emitted from the LD collimating lens 27 as in FIG. The light enters the effective aperture.
[0028]
The module fabrication will be described with reference to FIG.
[0029]
As shown in the figure, the above-described subcarrier 21 together with the Peltier element 29 and the optical isolator 30 is placed and fixed on a module case 28 with terminals for power supply, electric signal, APC control and temperature control. Then, a metal lid 31 is seam welded to the module case 28 in a nitrogen atmosphere to hermetically seal the module.
[0030]
After hermetic sealing, the output channel of the module is an aspherical collimating lens (for example, focal length: 3.2 mm, N / A: 0.2) 32 and a 4ch optical fiber array with a pitch conversion waveguide (pitch conversion array waveguide) (optical A fiber array) 33 is temporarily placed. The positions of the aspherical collimating lens 32 and the optical fiber array 33 are determined by aligning the optical axes so that the distance from the LD collimating lens 27 is d (for example, 4.8 mm) and e (for example, 8.0 mm).
[0031]
At this time, the image magnification by the two lenses is doubled, and the light beam from the waveguide of 100 μm pitch (from the LD array 23) is imaged at the same 200 μm pitch as the waveguide of the optical fiber array 33. Further, the incident angle of the beam is also tilted at most 80 ° from the direction perpendicular to the end face of the optical fiber, and the influence on the optical coupling due to the tilt is negligible.
[0032]
After temporarily placing the aspherical collimating lens 32 and the optical fiber array 33, the positions of the aspherical collimating lens 32 and the optical fiber array 33 are finely adjusted so that the light output from the four fibers becomes maximum and uniform. The module is completed by fixing by YAG welding.
[0033]
The optical coupling will be described with reference to FIG.
[0034]
The insertion loss of the LD array 23 and the optical fiber array 33 measured using the actually completed module is shown in FIG. Since the insertion loss of the optical isolator 30 is added, the insertion loss slightly increases (about 0.5 dB) compared to the first embodiment shown in FIG. 4, but all four channels are coupled with a loss of 4.54B to 5.5 dB. Thus, the result is inferior to the case where the tip-end fibers are aligned one by one.
[0035]
In the module structure of the present embodiment example, the insertion of an isolator, which has been conventionally difficult with a multi-channel module, is realized, and it is extremely effective for improving the transmission characteristics of the module. Furthermore, since the pitch conversion waveguide is provided in the LD array 23 to reduce the pitch, all four channels can be isolated with a single optical isolator 30, which is effective in simplifying the module structure and reducing the cost. In order to reduce electrical crosstalk, the LD array 23 was widened to a pitch of 500 μm, and it was confirmed that signal degradation due to crosstalk was negligible even when driving 10 Gbps for all 4 channels.
[0036]
The multi-channel optical module according to the above-described embodiment realizes small-sized and low-cost multi-channel collective coupling using the aspheric collimating lens 32 by using an optical coupling structure including pitch conversion between the optical functional element and the optical fiber. be able to. It is also possible to employ a configuration in which the pitch converting array waveguide is provided only between the optical functional element and the aspherical collimating lens 32.
[0037]
A third embodiment of the present invention will be described with reference to FIGS. FIG. 9 illustrates the structure of a two-dimensional surface-emitting laser array applied to the multichannel optical module according to the third embodiment of the present invention, and FIG. 10 illustrates the multichannel optical module according to the third embodiment. FIG. 11 illustrates the structure of the subcarrier of the multi-channel optical module according to the third embodiment, FIG. 12 illustrates the fabrication of the carrier, and FIG. 13 illustrates the third embodiment. FIG. 14 shows the description of the overall configuration of such a multi-channel optical module, and FIG. 14 shows the incident position of the emitted light beam from the two-dimensional surface-emitting laser array with respect to the effective aperture.
[0038]
In the present embodiment, an 8ch (4 × 2) two-dimensional surface emitting laser (VCSEL) array 41 as an arrayed optical element having an array pitch of 125 μm, for example, shown in FIG. 10ch, which is an optical signal transmission medium shown in FIG. 10, and has 8 channels (8 × 8) having a waveguide array 55 (pitch conversion and conversion from (8 × 1) to (4 × 2) of the waveguide array) at the tip. 1) Explaining the configuration, operation, and effects of a multi-channel optical module that realizes optical coupling with an optical fiber array 42 (250 μm pitch) using a single aspherical lens with a stainless steel holder with a magnification of 2 ×. It is.
[0039]
The subcarrier will be described with reference to FIGS.
[0040]
FIG. 11 shows an outline of subcarriers of an 8-channel optical transmission module using the two-dimensional surface-emitting laser (VCSEL) array 41 (FIG. 9) used in this embodiment. The subcarrier substrate 43 is made of AlN, and wire bonding pads 44 for 8 channels (4 × 2 lattice arrangement) are formed on the surface, and 9 tin lead ball grid arrays (8 channels and thermistors are combined on the back surface). BGA) 45 is formed. The solder balls of the ball grid array 45 corresponding to the wire bonding pads 44 are electrically connected. The two-dimensional surface-emitting laser array 41 is bonded onto the chip mount pad on the surface of the subcarrier substrate 43, and each two-dimensional surface-emitting laser array 41 is connected to the wire bonding pad 44 by wire bonding. Thereafter, the temperature control thermistor 46 is mounted at a specified position, and the subcarrier 47 is completed.
[0041]
The module fabrication will be described with reference to FIGS.
[0042]
The completed subcarrier 47 is soldered and fixed to a predetermined position on an AlN carrier 48 (multilayer wiring board) shown in FIG. 12 by a ball grid array (BGA). In addition, an 8-channel two-dimensional surface emitting laser (VCSEL) driver IC (IC) 49 is mounted at a predetermined position on the carrier 48, and the carrier is completed by connecting to an IC power supply pad, a ground pad, and a high-frequency signal wiring pad. To do. As shown in FIG. 13, the completed carrier is fixed on the Peltier element 50 and fixed together with the Peltier element 50 in a module case 51 having signal, power supply, and ground terminals. Each signal / power / ground pad 52 on the carrier fixed in the module case 51 is connected to a corresponding terminal pad 53 on the module case 51.
[0043]
Subsequently, for optical coupling between the two-dimensional surface emitting laser (VCSEL) array 41 and the optical fiber array 42, an aspherical lens 53 having the same magnification of 2.4 times as the lens used in the first embodiment is provided on the carrier. Secure to. At this time, the distance between the two-dimensional surface-emitting laser (VCSEL) array 41 and the aspherical lens 53 is amm (0.7 mm), as in the first embodiment, and the two-dimensional surface-emitting laser (VCSEL) array 41 and the aspherical surface. The central axes of the lenses 53 are coincident.
[0044]
For this reason, as shown in FIG. 14, the 8ch laser beam emitting part has a channel (ch2, 3, 6, 6) centered at ± 62.5 μm in the X direction and ± 62.5 μm in the Y direction from the center axis of the lens. 7) and channels (ch1,4,5,8) having centers at positions ± 187.5 μm in the X direction and ± 62.5 μm in the Y direction from the central axis. Further, the laser light from the two-dimensional surface emitting laser (VCSEL) array 41 is a circular beam, and the spread angle thereof is about 10 ° in both the X direction and the Y direction in FIG. Therefore, when the beam emitted from the end face of the two-dimensional surface emitting laser (VCSEL) array 41 enters the aspherical lens 53 separated by 0.7 mm, it has a circular shape with a diameter of about 140 μm (vertical direction). .
[0045]
FIG. 14 shows a two-dimensional surface emitting laser (VCSEL) array with four circular beams from the two-dimensional surface emitting laser (VCSEL) array 41 and a radius of 525 μm (N / A: 0.6) which is an effective aperture of the aspheric lens 53. The circle of 41 and the aspherical lens 53 (obtained from a distance of 0.7 mm) is shown in comparison. All four beams are incident on the effective aperture, and the emitted light has a 2.4 times pitch (300 μm) of the two-dimensional surface emitting laser (VCSEL) array 41 at a position about 6 mm away from the lens center by the aspherical lens 53. The image is formed as eight beams (having a beam diameter of about 8 μm).
[0046]
An optical fiber array 42 having a waveguide array 55 that performs pitch conversion and (8 × 1) to (4 × 2) conversion of the waveguide arrangement is placed near the imaging position in the module case 51, and actually 2 Dimensional surface emitting laser (VCSEL) ch1 and 8 of the array 41 are emitted to perform active alignment of the optical fiber array 42, and the waveguide array 55 and the optical fiber array 42 are fixed by UV curing resin. Finally, the module case 51 is covered with a lid 54 in a nitrogen atmosphere, and the fiber outlet is sealed with resin to complete the module. After completion, the insertion loss between the two-dimensional surface emitting laser (VCSEL) array 41 and the optical fiber array 42 was measured, and it was confirmed that all 8 channels were optically coupled with the same coupling loss 4 dB to 5 dB as in FIG. It was.
[0047]
The multi-channel optical module according to the above-described embodiment can be directly applied to the optical coupling of a two-dimensional multi-channel optical element by using an optical coupling structure including pitch conversion between the optical functional element and the optical fiber. 53 can realize a small and low-cost multi-channel collective coupling, and has excellent extensibility.
[0048]
【The invention's effect】
The multi-channel optical module of the present invention can simplify the optical coupling system of the multi-channel optical transceiver module and can be configured using parts equivalent to the optical coupling system of the single-channel optical transceiver module. Reduction can be achieved. Therefore, simple multi-channel collective optical coupling including pitch conversion between the optical functional element and optical fiber is realized, and it is flexible to increase the number of channels and widen the pitch of semiconductor optical elements, and promotes miniaturization and high speed. Thus, it becomes possible to obtain a multi-channel optical module in which the manufacturing process is complicated and the cost is suppressed.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a subcarrier structure of a multichannel optical module according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of an optical coupling state of subcarriers.
FIG. 3 is a comparative explanatory view of an effective opening and a laser beam.
FIG. 4 is a graph showing coupling loss.
FIG. 5 is an overall configuration diagram of a multi-channel optical module according to the first embodiment.
FIG. 6 is an explanatory diagram of a subcarrier structure of a multi-channel optical module according to a second embodiment.
FIG. 7 is an explanatory diagram of the overall configuration of a multi-channel optical module according to a second embodiment.
FIG. 8 is a graph showing coupling loss.
FIG. 9 is a structural explanatory diagram of a two-dimensional surface emitting laser array applied to a multi-channel optical module according to a third embodiment of the present invention.
FIG. 10 is a structural explanatory diagram of an optical fiber array applied to a multi-channel optical module according to a third embodiment.
FIG. 11 is an explanatory diagram of a subcarrier structure of a multi-channel optical module according to a third embodiment.
FIGS. 12A and 12B are explanatory diagrams of manufacturing a carrier. FIGS.
FIG. 13 is an explanatory diagram of the overall configuration of a multi-channel optical module according to a third embodiment.
FIG. 14 is an explanatory diagram of an incident position of an emitted light beam from a two-dimensional surface-emitting laser array with respect to an effective opening.
[Explanation of symbols]
1,21,47 Subcarrier 2,22 CuW block (block)
3 8ch semiconductor laser diode array (LD array)
4,25 PD4 for power monitor
5, 26, 46 Thermistor 6, 24 Wiring board 7, 53 Aspherical lens 8 Stainless block 9 8ch optical fiber array (optical fiber array)
10 MT ferrule section 10
11, 28, 51 Module case 12, 29, 50 Peltier element 13, 31, 54 Lid 23 4ch semiconductor laser diode array (LD array)
27 Aspherical laser diode collimating lens (LD collimating lens)
30 optical isolator 32 aspherical isolator lens 33 4ch optical fiber array (optical fiber array)
41 8ch (4 × 2) 2D surface emitting laser (VCSEL) array 42 8ch (4 × 2) optical fiber array 43 Subcarrier substrate 44 Wire bonding 45 Ball grid array (BGA)
49 Two-dimensional surface emitting laser (VCSEL) Driver IC (IC)
55 Waveguide Array for Pitch Conversion and Planar Array Conversion

Claims (4)

In a multi- channel optical module that optically couples an arrayed optical element and an arrayed optical fiber via a lens system,
An aspheric lens having a stable optical characteristic by providing a pitch converting array waveguide between the lens system and the arrayed optical fiber, and disposing an aspheric lens between the lens system and the array waveguide. An image is formed on the corresponding arrayed waveguide or core using the central region of the optical system, and the lens system and the arrayed optical fiber are optically coupled via the pitch converting array waveguide by a simple optical coupling system. A multi- channel optical module characterized by performing multi- channel batch connection. In a multi- channel optical module that optically couples an arrayed optical element and an arrayed optical fiber via a lens system,
Said lens system and provided with pitch conversion array waveguide between the array optical element, arranged aspheric lens between the arrayed waveguide and the lens system, non having stable optical characteristics focused on the array waveguide or core portion corresponding with the central region of the spherical lens, by simple optical coupling system, the array optical element and the lens system through the 該Pi pitch conversion array waveguide A multi- channel optical module characterized by optically coupling and performing multi- channel batch connection. In a multi- channel optical module that optically couples an arrayed optical element and an arrayed optical fiber via a lens system,
An aspheric lens having a stable optical characteristic by providing a pitch converting array waveguide between the lens system and the arrayed optical fiber, and disposing an aspheric lens between the lens system and the array waveguide. An image is formed on the corresponding arrayed waveguide or core using the central region of the optical system, and the lens system and the arrayed optical fiber are optically coupled via the pitch converting array waveguide by a simple optical coupling system. While performing multi- channel batch connection,
A second pitch converting array waveguide is provided between the lens system and the arrayed optical element, and an aspherical lens is disposed between the lens system and the arrayed waveguide so as to have stable optical characteristics. The center region of the spherical lens is used to form an image on the corresponding arrayed waveguide or core, and the lens system and the arrayed optical element are connected via the second pitch conversion arrayed waveguide by a simple optical coupling system. A multi- channel optical module characterized by optically coupling and performing multi- channel batch connection. Multi-channel optical module, characterized in that the multi-channel optical module according to any one of claims 1 to 3, the waveguide is provided with a spot size conversion unit.

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