JPH0336508A - Transmission and reception module for wavelength multiplex light - Google Patents

Abstract

PURPOSE:To obtain the wavelength multiplex optical transmission and reception module which suits to size reduction and to improve the manufacture operability by coupling the optical fiber of an optical transmission line side optically with one end of a main waveguide on a waveguide substrate, coupling either a light emitting element or a light receiving element optically with the other end, and coupling the element other than the element which is coupled optically with the main waveguide with one end of a subordinate waveguide. CONSTITUTION:A single or plural light emitting elements 1 for transmission and a single or plural light receiving elements 2 for reception are provided on a single waveguide substrate 3, the optical fiber 5 of the optical transmission side is coupled optically with one end of the main waveguide 4 formed on the waveguide substrate 3, and either of the light emitting elements 1 and light receiving elements 2 are coupled optically with the other end of the main waveguide 4. Then the elements other than the elements which are coupled optically with the main waveguide 4 are coupled optically with one end of the single or plural subordinate waveguides 6 formed on the waveguide substrate 3 so that a specific-length part is close to the main waveguide 4. Consequently, the wavelength multiplex optical transmission and reception module suit to size reduction and is excellent in manufacture operability is obtained.

Description

[Detailed Description of the Invention] Table of Contents Overview Industrial Field of Application Prior Art (Figs. 16 to 18) Means and operations for solving the problems to be solved by the invention (Figs. 1 to 7) Figure) Embodiment (Figures 8 to 15) Summary of Effects of the Invention Regarding a wavelength division multiplexing optical transceiver module used for wavelength division multiplexing optical communication in a subscriber system, it is suitable for miniaturization and has easy manufacturing workability. In order to provide a good wavelength multiplexing optical transceiver module, a single or multiple light emitting elements for transmission and a single or multiple light receiving element for reception are provided on a single waveguide substrate, and the waveguide substrate An optical fiber on the optical transmission line side is optically coupled to one end of the main waveguide formed above, and one of the light emitting element and the light receiving element is optically coupled to the other end of the main waveguide, and a predetermined length thereof is formed. An element other than the element optically coupled to the main waveguide is optically coupled to one end of a single or a plurality of sub-waveguides formed on the waveguide substrate so that the outer part is close to the main waveguide. .

INDUSTRIAL APPLICATION FIELD The present invention relates to a wavelength multiplexed optical transceiver module used for wavelength multiplexed optical communication in a subscriber system.

In recent years, optical fiber communications have become popular and are becoming widespread not only in trunk lines but also in subscriber lines. This is because subscriber systems are required to provide a wide range of services such as regular telephone services, data services, and video information services (for example, CATV), whereas optical fiber communication has the advantage of widening bandwidth. This is because a plurality of pieces of information can be transmitted bidirectionally using two optical fibers, especially when a wavelength multiplexing method is used, and the above requirements are met. A wavelength division multiplexing optical transmitter/receiver module is a key device in performing wavelength division multiplexing optical communication in a subscriber system, and there is a demand for miniaturization and improved manufacturing workability for its practical use.

BACKGROUND ART FIG. 16 shows an example of providing telephone and data services. The optical signal sent from the center office 101 to the central terminal 102 is branched to the remote terminal 103, and bidirectionally transmitted from the remote terminal 103 to each house 11a104. The area between the remote terminal 103 and each home 104 corresponds to a subscriber system, and it is expected that optical fiber transmission in this area will rapidly advance in the future.

FIG. 17 is a diagram showing an example of wavelength division multiplexing optical communication in a subscriber system. In the subscriber system, it is hoped that in the future it will be possible to add services such as CATV in addition to telephone services. The three-liquid multiplex system shown in the figure is the most effective system to meet these demands. In the same figure, 111
is the wavelength multiplexing optical transceiver module of the remote terminal,
112 is a wavelength multiplexing optical transceiver module for each household;
These modules are interconnected by - optical fibers 113. In the wavelength multiplexing optical transceiver module 111 of the remote terminal, 114 is a 0.78 μm LD (semiconductor laser) for telephone transmission, 115 is a 1.55 μm PD (photodiode) for telephone reception, and 11
6 is a 1.31μm pigtail for CATV transmission, 117
is an optical multiplexer. On the other hand, in the wavelength multiplexing optical transceiver module 112 of each home, 118 is 0.7 for telephone reception.
8 μm PD, 119 is 1.55 μmL for telephone transmission
D, 120 is a 1.31 μm pigtail for CATV reception, and 121 is an optical multiplexer. LD and F for telephone transmission and reception
D is built into the module and packaged, while the CATV service is in the form of an optical fiber pigtail that can be connected to other equipment, allowing CATV services to be added from the outside as necessary. This is a possible structure. According to this configuration, it is possible to simultaneously provide telephone, data, and CATV services using two optical fibers, increasing the added value of the subscriber system.

FIG. 18 shows a conventional example of a wavelength division multiplexing optical transceiver module. This module functionally corresponds to the wavelength multiplexed optical transceiver module 111 of the remote terminal shown in FIG. In FIG. 18, 122 is a fiber collimator of the optical fiber 113 on the optical transmission line side, and 123 is a CAT.
124 is an LD collimator with a built-in 0.78 μm LD for telephone transmission, 125 is a PD collimator with a built-in 1.55 μm FD for telephone reception, and 126 is glass on which various filter films for optical multiplexing are formed. 127 is a metal substrate on which the collimators and glass blocks are fixed, for example by soldering; 128 is an insulating substrate on which various electronic circuit components such as a preamplifier are mounted; 129 is a substrate 127 on the optical component side.
and a package in which the board 128 on the electronic component side is accommodated;
Reference numeral 130 is a lead for connection to an external circuit. bigdil 1
The light from the LD collimator 124 enters the fiber collimator 122 via the glass block 126, the light from the LD collimator 124 enters the fiber collimator 122 via the glass block 126, and the light from the optical fiber 113 on the optical transmission line side is incident on the FD collimator 125 via the glass block 126. Note that the module on the remote terminal side mentioned above actually only has the function of multiplexing, but the module in each home has the following functions:
Multiplexing and demultiplexing functions are performed by setting the collimator arrangement according to the required functions.

Problems to be Solved by the Invention The conventional module structure requires an optical system for converting the light beam, so there is a limit to miniaturization and there are problems in that manufacturing workability is poor. That is, in order to achieve the optical multiplexing function, a collimator structure is required to convert the light emitted from a light emitting element such as an LD or an optical fiber into a parallel light beam, or to focus the parallel light beam onto a light receiving element such as a PD. Moreover, since the filter needs to be constructed as a bulk type optical component, it is difficult to miniaturize the filter.

The present invention was created in view of these technical problems, and aims to provide a wavelength division multiplexing optical transceiver module that is suitable for miniaturization and has good manufacturing workability.

Means and Effects for Solving the Problems FIG. 1 is a diagram showing the basic configuration of the present invention, and FIG. 2 is a comparative diagram for explaining the effects of the basic configuration of the present invention.

The wavelength multiplexing optical transceiver module in the basic configuration of the present invention includes a single or multiple light emitting elements 1 for transmission and a single or multiple light receiving elements 2 for reception on a single waveguide substrate 3. An optical fiber 5 on the optical transmission line side is optically coupled to one end of the main waveguide 4 formed on the waveguide substrate 3, and one of the light emitting element 1 and the light receiving element 2 is connected to the other end of the main waveguide 4. The elements are optically coupled, and light is connected to the main waveguide 4 at one end of the single or plural sub-waveguides 6 formed on the waveguide substrate 3 so that a predetermined length portion thereof is close to the main waveguide 4. It is constructed by optically coupling elements other than the coupled elements.

According to this configuration, by bringing the predetermined length portion of the sub-waveguide 6 close to the main waveguide 4, multiplexing or demultiplexing of wavelength-multiplexed light is performed. This eliminates the need for bulk optical components for this purpose, making it possible to downsize the module and improve manufacturing workability.

When attempting to achieve a function such as multiplexing simply by using a waveguide structure, a configuration as shown in FIG. 2 may be proposed. That is, instead of placing the predetermined length portions of all the sub waveguides 6 close to the main waveguide 4 as in the basic configuration of the present invention, the predetermined length portions of the sub waveguides 6' are sequentially connected to the main waveguide 4 starting from the main waveguide 4. 4 or the sub-waveguide 6'. Compared to this configuration, the configuration of the present invention is effective in narrowing the width of the module, and this effect becomes more significant as the number of multiplexed wavelengths increases. Thus, according to the present invention,
The module can be further miniaturized than when a waveguide structure is simply adopted.

FIG. 3 is a diagram for explaining the setting of waveguide parameters,
FIG. 4 is a diagram showing an example of the relationship between coupling loss and wavelength in the vicinity of the main waveguide and sub-waveguide, and the setting of waveguide parameters will be explained based on these diagrams.

FIG. 3(a) is a diagram schematically showing the adjacent portion of the main waveguide 4 and the sub-waveguide 6, and FIG. 3(b) is a diagram showing (b)-(b).
FIG. 3 is a diagram schematically showing a cross section taken along a line. Now, the width of the main waveguide 4 and the sub waveguide 6 is a1, the height is b, the distance between the waveguides is C1, the coupling length is L1, the refractive index of the main waveguide 4 and the sub waveguide 6 is nl, and the surrounding medium corresponding to the cladding The refractive index of n
S, the wavelength of the propagating light is λ, then the perfect coupling length for optical coupling from one of the main waveguide 4 and the sub waveguide 6 to the other with minimum loss is π a 1 for the E mode. It is given as a solution that satisfies k-total π π ].

here, 8 (k.

- to 1 ky2 ) It is.

Also, k.

k.

teeth, 8 a=pπ−2jan−’k.

ξ.

...■ ξ5 ...■ ηS ...■ This is a solution that satisfies the following.

If you only consider the basic mode, p=　1゜ q = 1 is fine.

Even for the E mode, the complete bond length can be determined by simply changing the equations (1) and (2) to the following equations.

k, b=qπ-2tan-', 77s +
++■In this way, each parameter a* b* cr
By appropriately setting n and +n, the complete coupling length for light of a predetermined wavelength can be determined.

FIG. 4 is a graph showing the relationship between coupling loss and wavelength when, for example, light with a wavelength of 1.31 μm is coupled between the main waveguide 4 and the sub waveguide 6. The solid line is TE polarized light (
Polarized light whose electric field vector vibration plane is parallel to the waveguide substrate>, and the broken line corresponds to TM polarized light (polarized light whose electric field vector vibration plane is perpendicular to the waveguide substrate>). This section is suitable for demultiplexing light with a wavelength of 1.31 μm from wavelength-multiplexed light that has been wavelength-multiplexed so that the maximum wavelength is 1.31 μm, but it is suitable for applications where the maximum wavelength is 1°31 μm.
Wavelength 1.31 from wavelength multiplexed light that is not made to be
It is not suitable for applications that separate μm light. This is because, as is clear from the graph, in the region where the wavelength exceeds 1.31 μm, there are countless wavelengths where the coupling loss is 0. For example, light with a wavelength of 1.31 μm and light with a wavelength of 1.55 μm exist.
m light is wavelength multiplexed, the wavelength is 1°31
This is because it is not necessarily possible to separate only μm light. Also, from such wavelength multiplexed light, the wavelength is 1.31
Rather than demultiplexing only μm light, the wavelength is 1.31 μm.
m light and wavelength is 1. When attempting to separate light of 55 μm, the wavelength is l.

There is almost no polarization dependence for 31 μm light, but
Since the polarization dependence of light with a wavelength of 1.55 μm is relatively remarkable, the coupling state in the vicinity of the waveguide changes depending on the polarization state.

Considering these points, the wavelengths of the light to be demultiplexed are set to λ1. λ2. ..., λ. 〈λ. Ku...〈λ.

When λ, >, a good demultiplexing function can be achieved by making the wavelengths become smaller in order from the optical fiber 5 side on the optical transmission line side.

Therefore, in the wavelength multiplexing optical transceiver module whose basic configuration is shown in FIG. By setting the waveguide parameters so as to couple, and by making the wavelength of the light that is completely coupled in the above-mentioned adjacent portion become smaller in order from the side of the optical fiber 5 on the optical transmission line side of the main waveguide 4, wavelength multiplexing is performed. Light of a desired wavelength among the light can be easily demultiplexed, and the polarization dependence at that time is also reduced.

Note that it is also possible to set the waveguide parameters so that only the light with a wavelength of 1.31 μm is separated from the wavelength multiplexed light whose maximum wavelength is not 1.31 μm, but in such a case,
Compared to the configuration shown in FIG. 5, it is necessary to realize a waveguide with highly precisely controlled waveguide parameters, and from this point as well, the usefulness of the configuration shown in FIG. 5 is clear.

By the way, in a wavelength division multiplexing optical transceiver module used in a subscriber system, it may be necessary to separate the signal light and send it to another module instead of directly receiving a signal from CATV or the like. As a module configuration useful in such a case, a wavelength multiplexing optical transceiver module shown in FIG. 6 is provided. This module is a module whose basic configuration is shown in FIG.
An optical fiber 8 to be connected to another optical transmitting or receiving module is optically coupled to one end of the optical fiber. In addition, in FIG. 6, the wavelength of the light branched into the optional waveguide 7 is λ. (λ, λ0>), and the adjacent portion of the main waveguide 4 and the optional waveguide 7 is shown as being closest to the optical transmission line side. According to this configuration, the conventional example shown in FIG. In addition, since there is no need for a configuration in which the light from the optical fiber is made into a parallel beam and then condensed onto the optical fiber, miniaturization becomes possible and manufacturing workability improves.

On the other hand, there are cases where it is necessary to perform directional multiplexing using wavelength-multiplexed light of a certain wavelength (single wavelength).A module shown in FIG. 7 is provided as a module useful in such cases. This module is a module whose basic configuration is shown in FIG. 1, in which a Y-branch portion 9 is formed on the opposite side of the optical fiber 5 on the optical transmission line side of the main waveguide 4 or sub-waveguide 6, and each branch end emits light. The element 1 and the light-receiving element 2 are optically coupled together.In the figure, the Y-branch 9 is shown as being formed in the sub-waveguide 6.

According to this configuration, the sub waveguide 6 in which the Y branch part 9 is formed
Since multiplexing is performed in the vicinity of the main waveguide 4 and the main waveguide 4, directional multiplex transmission can be performed using the light emitting element i and the light receiving element 2 optically coupled to each branch end.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 8 is a configuration diagram of a wavelength multiplexing optical transceiver module in an embodiment of the present invention. 1 is a light emitting element such as an LD for a wavelength of 0.78 μm, and 2 is a light receiving element such as a PD for a wavelength of 1.55 μm. Implemented through layers. Reference numeral 4 denotes a main waveguide formed on the waveguide substrate 3, and the light emitting element 1 is optically coupled to one end of the main waveguide, and the optical fiber 5 on the optical transmission line side is optically coupled to the other end. A sub-waveguide 6 is formed on the waveguide substrate 3 so that a predetermined length portion thereof is close to the main waveguide 4, and one end of the sub-waveguide is optically coupled to the light receiving element 2. 7 is an optional waveguide formed on the waveguide substrate 3 so that a predetermined length portion thereof is close to the main waveguide 4, and one end thereof is, for example, C
It is optically coupled to an optical fiber 8 as a pigtail for ATV. 10 is a drive circuit chip for the light emitting element 1, and 11 is an amplifier circuit chip for the light receiving element 2, which are each mounted on the waveguide substrate 3 similarly to the light emitting element 1 and the light receiving element 2. 13 is a case in which the waveguide substrate 3 is housed, and 14 is a lead for connection to an external circuit. Note that the connection between the light emitting element 1 and the drive circuit chip 10, the connection between the light receiving element 2 and the amplifier circuit chip 11, and the connection between the drive circuit chip 10 and the amplifier circuit chip 11 and the connection leads 14 are performed, for example, on the waveguide substrate 3. The conductor pattern 12 is formed on the conductor pattern 12. Since the drive circuit section of the light emitting element 1 and the amplifier circuit section of the light receiving element 2 are mounted on the waveguide substrate 3 in this way, the bonding wire connection length can be significantly shortened, for example, and the influence of noise etc. can be minimized.

FIG. 9 is a diagram for explaining the waveguide parameters and the function of the waveguide adjacent portion in the embodiment of the present invention. Also,
FIG. 10 is a graph showing the relationship between the coupling loss in the vicinity of the waveguide and the wavelength in an example of the present invention.

In this embodiment, the length Ll of the portion where the main waveguide 4 and the sub waveguide 6 are close to each other is L+ = 10.232+n+n.

The waveguide spacing C1 in this vicinity is C+=10μm1
Length L2 of the adjacent part between the main waveguide 4 and the optional waveguide 7
La=0. 674 mm, the waveguide spacing c2 in this adjacent part is 02 = 4 μm, the width a and the height b of each waveguide
a=b=2.3μm1Refractive index n of each waveguide, n,=
1.5, refractive index n of the medium surrounding each waveguide, n5=1
．． It is set to 485.

FIG. 1O is a graph showing the relationship between the coupling loss in the vicinity of the waveguide and the wavelength when the parameters are set as described above. A is the wavelength dependence of the coupling loss when optically coupling from one side to the other between the main waveguide 4 and the sub-waveguide 6, and B is the optical coupling from one side to the other between the main waveguide 4 and the optional waveguide 7. The graph shows the wavelength dependence of coupling loss when The solid line corresponds to TE polarization, and the dashed line corresponds to TM polarization. In the vicinity of the main waveguide 4 and the sub-waveguide 6, light with a wavelength of 1.55 μm can be multiplexed or demultiplexed, and in the vicinity of the main waveguide 4 and the optional waveguide 7, light with a wavelength of 1.55 μm can be multiplexed or demultiplexed.
Light of 31 μm can be multiplexed or demultiplexed.

Therefore, for example, from the optical transmission line side to the main waveguide 4, the wavelength is 0.78. When wavelength-multiplexed signal light with wavelengths of 1.31 um, 1.31 ttm, and 1.55 μm is guided, only light with a wavelength of 1□55 μm can be taken out from the sub waveguide 6, and the wavelength of 1.31
Only light with a wavelength of 0.78 μm can be extracted from the optional waveguide 7, and only light with a wavelength of 0.78 μm can be extracted from the other end of the main waveguide 4. In this example, wavelength 1.
Although the coupling length for light of 55 μm is relatively long at about 10 m, the above coupling length can be shortened by changing the parameters a, b, ns, etc.

The above function is a unidirectional demultiplexer, but when actually using this module, the wavelength 1.55
Only the light of μm propagates from the center of Fig. 9 to the right, and the wavelength
Light with a wavelength of 0.78 μm and light with a wavelength of 1°31 μm propagate to the left from the content in the figure.

FIG. 11 is a diagram showing the manufacturing process of a waveguide in an embodiment of the present invention. First, as shown in FIG. 3A, the surface of the waveguide substrate 3 made of Si is oxidized to form a 5ins layer 3a. Next, as shown in FIG.
The Oa layer is formed by a CVD method, a sputtering method, or the like. Then, as shown in FIG. 3C, unnecessary portions of the waveguide layer 3b are removed by etching to form, for example, a main waveguide 4 and a sub-waveguide 6. Finally, a cladding layer 21 is formed around the main waveguide 4 and the sub-waveguide 6 (as shown in the figure).
Then, a layer 3102 is formed by a CVD method, a sputtering method, or the like. In this example, the refractive index of the Tie2-doped Si02 layer (waveguide layer 3b) is 1.485,
The refractive index of the Si02 layer which is not doped with Tie is 1.
It is 50. According to this manufacturing method, the top layer of the waveguide substrate can be made of the 5i02 layer, which is an insulator.
As described above, it is easy to integrally form the electronic circuit section using the conductor pattern. Electronic circuit part is cladding layer 2
The 5i02 layer 3a formed by surface oxidation may be exposed by masking the portion where the electronic circuit section is to be formed, and the 5i02 layer 3a may be formed on this surface.

FIG. 12 is a diagram showing an example of an optical coupling portion between a waveguide and a light receiving element in an embodiment of the present invention. In this embodiment, the end face of the optical coupling part of the sub-waveguide 6 is tilted from above the waveguide substrate at an inclination angle of 45° using, for example, a guising saw so that it is oblique to the waveguide propagation optical axis. Groove 2
2, total reflection occurs on the wall surface of the groove 22, and the totally reflected light is received by the light receiving element 2 provided on the cladding layer 21. According to this configuration, there is no need to separately provide a portion for attaching the light-receiving element 2, so the module can be miniaturized.

Furthermore, according to this method of forming the oblique end face, the groove 22 can be formed by simply moving the blade of the guising saw in parallel, so the manufacturing workability is better compared to methods such as polishing. .

FIG. 13 is a diagram showing an example of an optical coupling portion between a waveguide and a light emitting element in an embodiment of the present invention. In this example, the groove 23 is formed diagonally in the same way as shown in FIG.
The light emitted in the vertical direction from the light emitting element l mounted on the groove 23 is totally reflected at the wall surface of the groove 23, that is, the end face of the main waveguide 4, and is introduced into the main waveguide 4. 24 is a heat sink that is in contact with the light emitting element 1. By making the thickness of the cladding 1!21 sufficiently thin, the light beam emitted from the light emitting element 1 does not spread significantly, so that optical coupling can be achieved with high optical coupling efficiency.

According to the configuration shown in FIG. 12 or 13, the position of the light receiving element 2 or the light emitting element l can be easily adjusted on the cladding layer 21, so that the light receiving element 2 or the light emitting element 1 can be moved to a position that provides the maximum optical coupling efficiency. It is easy to determine the position of the element 1.

FIG. 14 is a diagram showing an example of reducing the loss of the optical coupling portion between the waveguide and the light emitting element in the embodiment of the present invention. When arranging the LD 26 to face the incident end face of the main waveguide 4, the thickness is determined according to the shape of the LD 26 and the position of the light emitting part in the LD 26 so that the light emitting part of the LD 26 faces approximately the center of the end face of the main waveguide 4. A spacer 25 is interposed between the LD 26 and the waveguide substrate 3 to form a height adjustment section. According to this configuration, it is possible to always obtain a high and constant optical coupling efficiency regardless of variations in the shape of the LD 26, etc. In order to make the spacer 25 also function as a heat sink, 3tlCu or the like can be used as the material.

FIG. 15 is a diagram showing another example of reducing the loss of the optical coupling portion between the waveguide and the light emitting element in the embodiment of the present invention. In this example, in order to arrange the LD26 at a predetermined height position, the LD
Before installing 26, install the Sin as a height adjustment part.
, the layer 3a is etched by a predetermined amount. Si
n, the amount of decrease Δh in the thickness of the layer 3a can be adjusted by the etching time. Even with this method, LD26
The optical coupling efficiency between the LD 26 and the main waveguide 4 can always be set to the maximum regardless of the shape of the LD 26 or the like.

The embodiments shown in FIGS. 14 and 15 are particularly effective when using an LD (semiconductor laser), which requires high positional accuracy in a fixed position, as a light emitting element.

As described in detail, according to the present invention, it is possible to provide a wavelength division multiplexing optical transceiver module that is suitable for miniaturization and has good manufacturing workability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the wavelength multiplexing optical transceiver module of the present invention, FIG. 2 is a comparison diagram for explaining the present invention in detail, and FIG. 3 is a diagram for explaining the setting of waveguide parameters. , Figure 4 is a diagram showing an example of the relationship between coupling loss and wavelength in the vicinity of the waveguide, Figure 5 is a diagram showing an example of a desirable arrangement of wavelengths of light that is completely coupled in the vicinity of the waveguide, Figure 6 is an explanatory diagram of an optional waveguide, FIG. 7 is an explanatory diagram of a Y branch, FIG. 8 is a configuration diagram of a wavelength multiplexing optical transceiver module in an embodiment of the present invention, and FIG. 9 is a diagram of a waveguide in an embodiment of the present invention. Figure 10 is a graph showing the relationship between coupling loss and wavelength in the vicinity of a waveguide in an embodiment of the present invention. Figure 11 is a diagram for explaining the function of the vicinity of a waveguide in an embodiment of the present invention. Figure 12 is a diagram showing an example of the optical coupling part between the waveguide and the light-receiving element in the embodiment of the present invention, and Figure 13 is the diagram showing the optical coupling between the waveguide and the light-emitting element in the embodiment of the present invention. 14 is a diagram showing an example of reducing the loss of the optical coupling part between a waveguide and a light emitting element in an embodiment of the present invention. FIG. 15 is a diagram showing an example of a waveguide and a light emitting element in an embodiment of the present invention. FIG. 16 is a diagram showing an example of providing telephone and data services; FIG. 17 is a diagram showing an example of wavelength division multiplexing optical communication in a subscriber system; FIG. 18 is a diagram showing a conventional example of a wavelength multiplexing optical transceiver module. l... Light emitting element, 2... Light receiving element, 3... Waveguide substrate, 4... Main waveguide, 5.8... Optical fiber, 6... Sub-waveguide, 7... Optional waveguide, 9...Y branch.

Claims (7)

[Claims] (1) A single or multiple transmitting light emitting elements (1) and a single or multiple receiving light receiving elements (2) are provided on a single waveguide substrate (3), and the waveguide substrate ( 3) An optical fiber (5) on the optical transmission line side is optically coupled to one end of the main waveguide (4) formed above, and the light emitting element (1) and the light receiving element (2) are connected to the other end of the main waveguide (4). ), and a single or plural subguides formed on the waveguide substrate (3) such that a predetermined length portion thereof is close to the main waveguide (4). A wavelength multiplexing optical transceiver module characterized in that an element other than the element optically coupled to the main waveguide (4) is optically coupled to one end of the waveguide (6). (2) Set the waveguide parameters so that the light of a predetermined wavelength transmitted or received by the element optically coupled to the sub-waveguide (6) is completely coupled in the vicinity of the main waveguide (4) and the sub-waveguide (6). The wavelength of the light to be set and to be completely coupled in the above-mentioned adjacent portion is the optical fiber (5) on the optical transmission line side of the main waveguide (4).
2. The wavelength division multiplexing optical transceiver module according to claim 1, wherein the wavelength division multiplexing optical transceiver module is configured such that the wavelength becomes smaller in order from the side. (3) Form an optional waveguide (7) on the waveguide substrate (3) so that a predetermined length portion thereof is close to the main waveguide (4), and attach another waveguide to one end of the optional waveguide (7). 2. The wavelength multiplexing optical transceiver module according to claim 1, wherein an optical fiber (8) to be connected to the optical transmitter or receiver module is optically coupled. (4) A Y branch (9) is formed on the opposite side of the optical fiber (5) on the optical transmission line side of the main waveguide (4) or sub waveguide (6), and a light emitting element (1) and a light emitting element (1) are formed at each branch end. The wavelength multiplexing optical transceiver module according to claim 1, characterized in that the light receiving element (2) is optically coupled. (5) The end face of the main waveguide (4) or sub waveguide (6) is formed obliquely to the propagation optical axis to cause total reflection, and the light emitting element (1) or light receiving element ( 2), whereby the main waveguide (4) or the sub waveguide (6) and the light emitting element (1) or the light receiving element (2) are optically coupled to each other. Wavelength multiplexing optical transceiver module. (6) The light emitting element optically coupled to the main waveguide (4) or the sub waveguide (6) is a semiconductor laser (26), and the waveguide substrate (3
) on the part on which the semiconductor laser (26) is attached is provided with a height adjustment section, and the semiconductor laser (26) and the main waveguide (4) are attached.
2. The wavelength-multiplexed optical transmitter/receiver according to claim 1, wherein the wavelength-multiplexed optical transmitter/receiver is configured to optically couple with the sub-waveguide (6) with low loss. (7) The wavelength multiplexed light according to claim 1, wherein the drive circuit section of the light emitting element (1) and the intensifier circuit section of the light receiving element (2) are mounted on the waveguide substrate (3). Transmitting/receiving device.