JP6794140B2 - Optical transmitter and optical module including it - Google Patents

Description

The embodiment relates to an optical transmitter used for optical communication and an optical module including the same.

Generally, an optical transmission / reception module is a module that accommodates various optical communication functions in one package and can be connected to an optical fiber. Recently, a bidirectional optical module that modularizes an optical transmitter that uses a laser diode that consumes less power and can be used over long distances as a light source and an optical receiver that uses a photodiode for optical communication. Is mainly used.

The bidirectional optical transmitter / receiver module basically includes an optical transmitter, an optical receiver, an optical filter, a receptacle, and the like. In addition, an isolator is installed to prevent the characteristics of the laser diode from becoming unstable due to reflected noise.

The optical transmitter can include a TEC that regulates the temperature of the laser diode, a monitoring PD that monitors the optical output of the laser diode, and a thermistor that senses the temperature of the laser diode. Such an optical transmitter can be a TO-CAN (TO-CONTROLLER AREA NETWORK) type with a TO-56 header.

Generally, the monitoring PD monitors the light output from the back surface (Back Facet), not the light from the front surface (Front Facet) of the laser diode coupled to the external channel (optical fiber). Therefore, there is a problem that the output of light used for actual communication cannot be accurately monitored, and there is a problem that the accuracy drops when operating a circuit for stabilizing the optical output.

Also, the thermistor is located far away from the laser diode due to spatial issues. Therefore, in the case of a product such as DWDM that requires wavelength safety, it is difficult to finely adjust the wavelength of the laser diode.

An embodiment of the present invention provides an optical transmitter capable of accurately monitoring the optical output of a laser diode and an optical module including the same.

An embodiment of the present invention provides an optical transmitter capable of accurately sensing the temperature of a laser diode and an optical module including the same.

An embodiment of the present invention provides an optical transmitter in which optical components can be easily assembled and an optical module including the same.

The embodiments of the present invention provide an optical module in which the optical coupling between the optical transmitter and the receptacle is excellent.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

The optical transmitter according to the embodiment of the present invention is arranged on the support substrate, the temperature control module arranged on the support substrate, the submount arranged on the temperature control module, and the temperature control module. The light receiving element includes a prism having an inclined surface, a light receiving element arranged on the temperature control module, a light emitting element arranged on the submount, and a thermistor arranged on the submount. Is arranged apart from the submount in the first direction, the prism is arranged between the light receiving element and the submount, and a part of the first light emitted from the light emitting element is the prism. A part of the first light is reflected by the inclined surface of the above, passes through the prism, and is received by the light receiving element.

The temperature control module is at least one arranged between the first pad arranged on the support substrate, the second pad arranged on the first pad, and the first pad and the second pad. It can include one or more thermoelectric semiconductors.

The prism, light receiving element and submount can be arranged on the second pad.

The second pad may include a conductive layer that is electrically connected to the light receiving element.

The second pad may include an align groove formed on the conductive layer on which the prism is arranged.

The light emitting element includes a first side surface that emits the first light toward the prism and a second side surface that faces the first side surface, and the thermistor has one surface that faces the second side surface of the light emitting element. Can be placed in.

The angle formed by one surface of the thermistor and the second side surface of the light emitting element can be 25 degrees to 45 degrees.

The light emitting element has a first side surface that emits first light forward toward the prism, a second side surface that faces the first side surface, and a third side surface and a fourth side surface that connect the first side surface and the second side surface. The thermistor can be placed adjacent to the third side surface.

The width of the submount is larger than the width of the temperature control module, and the width of the submount and the width of the temperature control module can be the length in the second direction perpendicular to the first direction.

One side surface of the temperature control module, including a plurality of first lead electrodes arranged along one side surface of the temperature control module and a plurality of second lead electrodes arranged along the other side surface of the temperature control module. And the other side surface can be a side surface parallel to the first direction.

A housing coupled to the support substrate and a lens arranged in the housing and condensing the first light reflected by the inclined surface can be included.

An optical module according to an embodiment of the present invention includes a case, an optical transmitter inserted into the case, an optical receiver, and a receptacle, wherein the optical transmitter is on a support substrate and the support substrate. A temperature control module arranged in, a submount arranged on the temperature control module, a prism arranged on the temperature control module having an inclined surface, and a light receiving element arranged on the temperature control module. A light emitting element arranged on the submount and a thermistor arranged on the submount are included, the light receiving element is arranged apart from the submount in a first direction, and the prism is arranged. A part of the first light emitted from the light emitting element, which is arranged between the light receiving element and the submount, is reflected by the inclined surface of the prism, and a part of the first light passes through the prism. Then, the light is received by the light receiving element.

The receptacle includes an optical fiber to which the first light is coupled, and the end face of the optical fiber can be inclined.

According to the embodiment of the present invention, the monitoring PD can directly monitor the output of light used for communication. Therefore, the light output can be stabilized.

Further, since the thermistor is arranged close to the laser diode, the wavelength safety due to the temperature change becomes excellent.

Further, the angle of the inclined surface of the prism can be adjusted according to the polishing angle of the optical fiber of the receptacle to reduce the reflection at the end surface of the optical fiber. Therefore, the photocoupling efficiency can be improved.

In addition, die bonding and wire bonding of optical components are facilitated.

The diverse and beneficial advantages and effects of the present invention are not limited to those described above and will be more easily understood in the process of explaining specific embodiments of the present invention.

The drawing which shows the optical module by one Example of this invention. The drawing for demonstrating the state which the optical fiber of a receptacle and the first light output from an optical transmitter are coupled. The drawing which shows the optical transmitter according to one Example of this invention. The drawing which shows the concrete structure of an optical transmitter. A drawing showing a state in which each component is electrically connected to a lead electrode. The drawing which shows the arrangement relation of a laser diode and a thermistor. A modified example of FIG. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing for demonstrating the manufacturing process of the optical transmitter according to one Example of this invention. The drawing which shows the optical module by another Example of this invention.

The present invention can be modified in various ways and can have various examples, and specific examples will be described in detail by exemplifying the drawings.

However, this is not intended to limit the invention to any particular embodiment, but should be understood to include all modifications, equivalents or alternatives contained within the ideas and technical scope of the invention.

In the present invention, terms such as "including" or "having" are intended to specify the existence of features, numbers, stages, actions, components, parts or combinations thereof described herein. It should be understood that it does not preclude the possibility of existence or addition of one or more other features or numbers, stages, actions, components, parts or combinations thereof. is there.

It should also be understood that the drawings attached in the present invention are shown enlarged or reduced for convenience of explanation.

Hereinafter, the present invention will be described in detail with reference to the drawings, and the same or corresponding components will be given the same reference number regardless of the drawing reference numerals, and duplicate description thereof will be omitted.

FIG. 1 is a drawing showing an optical module according to an embodiment of the present invention.

Referring to FIG. 1, the optical module according to an embodiment of the present invention includes a case 100, a receptacle 200 inserted into the case 100, an optical transmitter 300, and an optical receiver 400.

The case 100 includes a receptacle 200, an optical transmitter 300, and a plurality of openings into which the optical receiver 400 is inserted. Specifically, the receptacle 200 and the optical transmitter 300 may be arranged so as to face each other in the case 100, and the optical receiver 400 may be arranged in a direction perpendicular to the direction in which the optical transmitter 300 is inserted. it can. However, the arrangement is not necessarily limited to this, and the arrangement of the receptacle 200, the optical transmitter 300, and the optical receiver 400 can be variously modified.

The receptacle 200 is connected to an external connector and outputs a second optical signal output from the outside toward the first optical filter 510. The receptacle 200 includes a first holder 230 coupled to the case 100, a stub 210 sandwiched between the first holder 230 and an optical fiber 211 arranged inside, a sleeve 240 coupled to the stub 210, and a first holder. A second holder 250, which is coupled to 230 and to which an external connector can be connected, can be included.

The optical transmitter 300 transmits the first optical signal to the outside via the optical fiber 211 of the receptacle 200. The first optical signal has a wavelength different from the wavelength of the second optical signal output from the optical fiber 211. For the optical transmitter 300, all general TO-CAN (TO-CONTROLLER AREA NETWORK) structures including a light source 340, a support substrate, and a lens can be applied.

The light source 340 is composed of a semiconductor light emitting element, converts an electrical signal into an optical signal, and outputs the signal. The light source can be a Laser Diode. Laser diodes have the advantages of low power consumption, narrow spectrum width, and the ability to finely collect high-power light. Hereinafter, the light source will be described as a laser diode.

The support substrate 310 on which the laser diode 340 is mounted is formed in a disk shape, and a plurality of lead electrodes 311 and 312 are inserted through the support substrate 310. Lead electrodes 311 and 312 form an electrical path between the light source and an external circuit board (not shown). As an example, a positive electrode (+) signal, a negative electrode (−) signal, and a ground signal can be output to each lead electrode.

The lens 390 collects the first optical signal and transmits it to the receptacle 200 side. The lens 390 can be positioned appropriately so that it is optically coupled to the optical fiber 211 of the receptacle 200.

The distance adjusting member 600 includes a first adjusting member 610 arranged on the other side of the case 100 and a second adjusting member 620 inserted and fixed to the first adjusting member 610. The distance that the first optical signal emitted from the optical transmitter 300 reaches the optical fiber 211 can be adjusted according to the degree of insertion of the second adjusting member 620 and the first adjusting member 610. Therefore, the output of the optical transmitter 300 can be adjusted according to the degree of insertion of the second adjusting member 620 and the first adjusting member 610. The optical transmitter 300 is inserted and fixed to one side of the second adjusting member 620.

The first adjusting member 610 and the second adjusting member 620 are manufactured in a cylindrical shape with an empty inside, and are formed so as to have different diameters. The second adjusting member 620 is inserted into an appropriate position of the first adjusting member 610 and then fixed by welding or the like. At this time, the appropriate position means a position adjusted to the required output level of the first optical signal.

The optical receiver 400 converts a second optical signal received from the outside via the optical fiber 211 into an electrical signal. The optical receiver 400 includes a photodiode (Photo Diode). When an optical signal is incident on a photodiode, a reverse current that is proportional to the amount of incident light flows. That is, the optical receiver 400 can convert an optical signal into an electrical signal by changing the output current according to the amount of incident light.

The first optical filter 510 can be arranged between the optical transmitter 300 and the receptacle 200 as an optical filter (Optical Filter), and allows an optical signal transmitted from the optical transmitter 300 to pass through the receptacle 200. It is transmitted to the optical fiber 211.

The first optical filter 510 can be designed to pass only optical signals of a specific wavelength. For example, the first optical filter 510 can pass the first optical signal output from the optical transmitter 300 and reflect the second optical signal output from the outside via the optical fiber 211 of the receptacle 200. The first optical filter 510 is composed of a 45-degree filter and can reflect the second light signal in the direction perpendicular to the incident direction, but the arrangement and the reflection angle of the first optical filter 510 are not necessarily limited to this. The first optical filter can also be a splitter.

The second optical filter 530 passes the second optical signal reflected by the first optical filter 510. The second optical signal that has passed through the second optical filter 530 is transmitted to the optical receiver 400 and can be converted into an electrical signal by the optical receiver 400.

The second optical filter 530 can be arranged so as to face the first optical filter 510 in order to pass an optical signal vertically reflected by the first optical filter 510, and shall be composed of a 0 degree filter. Can be done.

The isolator 520 can block the optical signal reflected and received by the optical fiber 211 or the optical component provided in the optical module. The isolator 520 can include a polarizer that passes only an optical signal of a preset polarization component, an analyzer, and a Faraday rotator that rotates an internally input optical signal by rotating polarized light by 45 degrees.

FIG. 2 is a drawing for explaining a state in which the optical fiber of the receptacle and the first light output from the optical transmitter are coupled.

With reference to FIG. 2, the tip 211a of the optical fiber 211 can be polished so as to have an angle θ ₁ of about 8 degrees with respect to the vertical line. Therefore, the optical path of the second optical signal L ₂ emitted from the optical fiber 211 is emitted with an angle θ ₂ tilted by about 4 degrees with respect to the central axis P ₁ . However, the inclination angle and the emission angle of the tip of the optical fiber 211 can be variously modified depending on the type of the optical module.

When the optical path of the second optical signal L ₂ output from the optical fiber 211 and the optical path of the first optical signal L ₁ output from the optical transmitter 300 incident on the optical fiber 211 match, the optical fiber Reflection at the end face can be reduced. Therefore, the photocoupling efficiency can be improved. Here, the optical path can be the path of the main ray.

That is, when the first virtual line extending the second optical signal L ₂ has an angle of about 4 degrees with the central axis P ₁ , the second virtual line extending the first optical signal L ₁ also has the central axes P ₁ and 4 Will have a degree angle. Here, the emitted optical path can be the path of the second optical signal L ₂ emitted to the optical fiber 211, and the incident optical path means that the first optical signal L ₁ is incident on the optical fiber 211. It can be the final optical path.

If the outgoing light path of the second light signal L _{2 and} the incident light path of the first light signal L ₁ match, the optical coupling efficiency can be improved. Further, the noise that the light emitted from the optical transmitter 300 is reflected by the optical fiber 211 can be reduced, and the reliability is improved.

In the embodiment of the present invention, the angle θ ₃ of the inclined surface 361 of the prism 360 that reflects the first light signal L ₁ emitted by the laser diode 340 is adjusted to adjust the incident light path of the first light signal L _1. be able to. At this time, the angle θ _{3 of the} inclined surface can satisfy the following equation 1.

_{θ 3 = 45 ° ± θ 1} /2 ( Equation 1)

Here, θ ₁ is the polishing angle of the optical fiber 211 of the receptacle 200.

Illustratively, when the tip of the optical fiber 211 is polished to about 8 degrees with respect to the vertical line, the angle θ ₂ of the emitted light path of the second optical signal L ₂ is about 4 with respect to the central axis P _1. Degree. At this time, when the angle of the inclined surface 361 of the prism 360 is about 41 degrees or 49 degrees, the optical coupling efficiency can be improved. The angle θ ₃ of the inclined surface with reference to FIG. 2 can be about 41 degrees. However, when the angle of the inclined surface of the optical transmitter 180 ° rotational symmetry with respect to the center axis P _1, the angle theta ₃ of the inclined surface may be 49 degrees.

FIG. 3 is a drawing showing an optical transmitter according to an embodiment of the present invention, and FIG. 4 is a drawing showing a specific configuration of the optical transmitter.

With reference to FIG. 3, the optical transmitter 300 according to the embodiment includes a support substrate 310, a temperature control module 320 arranged on the support board 310, a submount 330 arranged on the temperature control module 320, and temperature control. A prism 360 arranged on the module 320 and having an inclined surface 361, a light receiving element 370 arranged on the temperature control module 320, a laser diode 340 arranged on the submount 330, and an arrangement on the submount 330. Thermistor 350 and.

The support substrate 310 has a disk shape, and has one side 310a and the other side. A plurality of lead electrodes 311 and 312 can be inserted into the support substrate 310. The support substrate 310 can be, but is not limited to, a TO-56 header.

The light receiving element 370 is arranged apart from the submount 330 in the first direction D, and the prism 360 can be arranged between the light receiving element 370 and the submount 330. The first direction is parallel to the support substrate 310 can be a central axis P ₁ and perpendicular.

A part L ₁ of the first light emitted by the laser diode 340 is reflected by the inclined surface 361 of the prism 360, and a part L ₃ of the remaining first light can pass through the prism 360. The inclined surface 361 of the prism 360 has an angle of 41 degrees to 49 degrees with the first light, and the reflectance can be 92% to 98%. Therefore, 92% to 98% of the first light can be reflected and emitted to the outside through the lens 390. As described above, the angle of the inclined surface 361 can be adjusted to improve the light coupling efficiency between the emitted light and the optical fiber 211 of the receptacle 200.

The remaining 2% to 8% of the light L ₃ can pass through the prism 360 and be incident on the active region of the light receiving element 370. The light receiving element 370 can monitor the output of the first light emitted by the laser diode 340. According to the embodiment, since the light receiving element 370 directly monitors the light output coupled with the optical fiber 211, the light output can be controlled more stably.

The housing 380 can be arranged on the support substrate 310 to protect the optical components. The lens 390 arranged in the center of the housing 380 can collect the first light reflected by the inclined surface and emit it, or convert it into parallel light.

With reference to FIG. 4, the temperature control module 320 has a first pad 321 arranged on the support substrate 310, a second pad 322 arranged on the first pad 321 and a first pad 321 and a second pad 322. It can include at least one or more thermoelectric semiconductors 323 arranged between and. The temperature control module 320 can be a thermoelectric element, but all the various configurations capable of controlling the temperature inside the optical transmitter 300 can be applied.

In the first pad 321, the first and second electrode patterns 321a and 321b can be formed on the insulating layer. The insulating layer can be any one of Al ₂ O ₃ and AIN, and the first and second electrode patterns 321a and 321b can be Au plated on the insulating layer, but are insulated. The material of the layer and the conductive pattern is not particularly limited.

The second pad 322 can have a conductive pattern formed on the insulating layer. The material of the insulating layer and the conductive pattern can be the same as that of the first pad 321. The second pad 322 can be a cooling pad.

The plurality of first lead electrodes 311 may be arranged along one side surface of the temperature control module 320, and the plurality of second lead electrodes 312 may be arranged along the other side surface of the temperature control module 320. The plurality of first lead electrodes 311 and second lead electrodes 312 can be arranged so as to protrude toward the first direction. That is, the 1-1 lead electrode 311a electrically connected to the temperature control module 320 can be arranged lower than the 1-3 lead electrode 311c electrically connected to the laser diode 340.

The prism 360 is arranged in the align groove 322b formed in the second pad 322, and can be arranged in close contact with the submount 330. A laser diode 340 and a thermistor 350 can be arranged on the submount 330.

FIG. 5 is a drawing showing a state in which each component is electrically connected to a lead electrode, FIG. 6 is a drawing showing an arrangement relationship between a laser diode and a thermistor, and FIG. 7 is a modification of FIG.

With reference to FIG. 5, the first electrode pattern 321b arranged on the first pad 321 is electrically connected to the 1-1 lead electrode 311a, and the second electrode pattern 321a is the 2-1 lead electrode 312a. Can be electrically connected to. The first electrode pattern 321b and the second electrode pattern 321a can apply a power source to the thermoelectric semiconductor 323.

The electrode formed on the upper surface of the light receiving element 370 is electrically connected to the 1-2 lead electrode 311b, and the electrode pattern 322a arranged on the upper surface of the second pad 322 is electrically connected to the 2-2 lead electrode 312b. Can be connected.

The electrode pattern 331 on which the laser diode 340 is arranged can be electrically connected to the 1-3 lead electrode 311c, and the electrode pattern 334 arranged adjacent to the laser diode 340 and electrically connected is the first. 2-3 It can be electrically connected to the lead electrode 312c. According to such a configuration, the heat source of the 2-3 lead electrode 312c is not directly transmitted to the laser diode 340, and the thermal reliability can be ensured. Moreover, the length of the wire W can be shortened.

The electrode pattern 332 on which the thermistor 350 is arranged can be electrically connected to the 1-4 lead electrode 311d, and the electrode pattern 333 arranged adjacent to the thermistor 350 is electrically connected to the 2-4 lead electrode 312d. Can be connected. According to such a configuration, the heat source of the 2nd-4th lead electrode 312d is not directly transferred to the thermistor 350, and the thermal reliability can be ensured.

According to the embodiment of the present invention, the width W _{1 of the} submount 330 can be made larger than the width W ₂ of the temperature control module 320. The width W ₂ of width W ₁ and the temperature control module 320 of the submount 330 may be a length in the first direction D perpendicular to the second direction. With this configuration, it is possible to shorten the length of the wire the larger the width W ₃ of the submount 330, it is possible to reduce the L component of the wire W (inductance).

The difference (W ₃ + W ₃ ) between the width W _{1 of the} submount 330 and the width W ₂ of the temperature control module 320 can be about 20 mm to 40 mm. Illustratively, the width of the temperature control module 320 can be 120 mm and the width of the submount can be 150 mm, but is not limited to this.

Referring to FIG. 6, the laser diode 340 includes a first side surface 341 that emits first light toward the prism 360 and a second side surface 342 that faces the first side surface 341, and the thermistor 350 includes one side surface 351. Can be arranged to face the second side surface 342 of the laser diode 340. According to the embodiment, the thermistor 350 is arranged close to the laser diode 340 so that the temperature change of the laser diode 340 can be accurately measured. Therefore, the change in the wavelength of light due to the temperature change can be effectively suppressed.

At this time, the angle θ ₄ formed by the one surface 351 of the thermistor 350 and the second side surface 342 of the laser diode 340 can be 25 degrees to 45 degrees. When the angle θ ₄ is less than 25 degrees, the light output to the second side surface 342 is reflected by one surface 351 of the thermistor 350 and can be incident on the laser diode 340 again. In this case, the output of the laser diode 340 can become unstable. When the angle θ ₄ exceeds 45 degrees, the effective area facing the laser diode 340 becomes small, and accurate temperature measurement can be difficult.

With reference to FIG. 7, the thermistor 350 can be arranged adjacent to the side surface of the laser rather than the light emitting surface. In this case, the light output behind the laser is not reflected. In this case, the electrode pattern 331 on which the laser diode 340 is arranged is electrically connected to the 1-3 lead electrode 311c, and the electrode pattern 332 connected to the laser diode 340 by a wire is the 1-4 lead electrode 311d. Can be electrically connected to.

The electrode pattern 334 on which the thermistor 350 is arranged is electrically connected to the 2-3 lead electrode 312c, and the electrode pattern 334 connected to the laser diode 340 by a wire is electrically connected to the 2-4 lead electrode 312d. Can be linked. That is, according to the embodiment of the present invention, the laser diode 340 and the thermistor 350 can be electrically connected to the lead electrodes arranged on the same side surface.

8a to 8g are drawings for explaining a manufacturing process of an optical transmitter according to an embodiment of the present invention.

With reference to FIG. 8a, the plurality of first lead electrodes 311 can be arranged on one side, and the plurality of second lead electrodes 312 can be arranged apart from the first lead electrode 311. The plurality of first lead electrodes 311 and second lead electrodes 312 can be inserted through the insulating member 313 and electrically insulated from each other.

With reference to FIG. 8b, the temperature control module 320 can be die-bonded between the plurality of first lead electrodes 311 and the second lead electrodes 312. An align groove 322b can be formed in the electrode pattern 322a of the second pad 322. With reference to FIG. 8c, the prism 360 can be die-bonded to the align groove 322b.

With reference to FIG. 8d, the submount 330 can be die-bonded to the align groove 322b of the second pad 322. At this time, one surface of the submount 330 can come into contact with the prism 360. That is, if the prism 360 is fixed in the align groove 322b and then the submount 330 is fixed so as to be in close contact with the prism 360, the laser diode 340 and the prism 360 can be optically aligned. After that, the thermistor 350 and the light receiving element 370 can be die-bonded as shown in FIGS. 8e and 8f.

After that, referring to FIG. 8g, each electrode pattern 331, 332, 333, 334 can be electrically connected to each lead electrode 311 and 312 by using a wire W. After that, the housing 380 can be welded onto the support substrate 310 to protect the optical components.

According to the embodiment of the present invention, each component may be assembled (die-bonded) in sequence without rotation in the state of being aligned for the first time. Therefore, productivity can be improved, unnecessary steps can be minimized, and defects that can occur during work can be minimized.

Further, even in wire bonding, wire bonding can be performed by adjusting only the height on the same plane without rotation. Therefore, productivity can be improved.

FIG. 9 is a drawing showing an optical module according to another embodiment of the present invention.

Referring to FIG. 9, the optical modules according to the other embodiments include a case 100, a receptacle 200 inserted into the case 100, a first optical transmitter 300, a second optical transmitter 600, and an optical receiver 400. , Can be included. The optical signal incident from the outside through the receptacle 200 can be reflected by the first optical filter 510 and incident on the optical receiver 400.

The optical signal output via the first optical transmitter 300 is reflected by the 1-2 optical filter 540, passes through the first optical filter 510, is output to the outside, and is output to the outside via the second optical transmitter 600. The output optical signal can pass through the first and second optical filters 540 and the first optical filter 510 and be output to the outside.

An isolator 520 can be arranged between the first optical filter 510 and the first and second optical filters 540 in order to block reflected noise. Such types of optical modules can be of the Triplexer type.

At this time, the first optical transmitter 300 and / or the second optical transmitter 600 can include the above-described optical transmitter configuration as it is. Further, the first optical transmitter 300 or the second optical transmitter 600 can be an electric field absorption type laser diode (Electro-Absorptive Laser, EML).

100: Case 200: Receptacle 300: Optical transmitter 310: Support substrate 320: Temperature control module 330: Submount 340: Laser diode 350: Thermistor 360: Prism 370: Light receiving element 400: Optical receiver

Claims (11)

Support board and
A temperature control module arranged on the support substrate and
With the sub-mount placed on the temperature control module,
A prism arranged on the temperature control module and having an inclined surface,
The light receiving element arranged on the temperature control module and
The light emitting element arranged on the submount and
The thermistor placed on the sub mount and
The plurality arranged alongside one plurality of first lead electrode arranged along the sides, and said plurality along the other side of the first lead electrode of said temperature regulating module of the temperature control module Includes 2 lead electrodes
The light receiving element is spaced apart from the submount in the first direction, and the prism is placed between the light receiving element and the submount.
A part of the first light emitted from the light emitting element is reflected by the inclined surface of the prism, and the rest of the first light passes through the prism and is received by the light receiving element.
The light emitting element includes a first side surface that emits the first light toward the prism and a second side surface that faces the first side surface.
The thermistor is arranged so that one side faces the second side surface of the light emitting element.
The angle formed by one surface of the thermistor and the second side surface of the light emitting element is 25 degrees to 45 degrees.
The submount contains a plurality of electrode patterns arranged on the upper surface.
The plurality of electrode patterns are a first electrode pattern in which the light emitting element is arranged, a second electrode pattern in which the thermistor is arranged, and a third electrode arranged between the first electrode pattern and the second lead electrode. The pattern, the fourth electrode pattern arranged between the second electrode pattern and the second lead electrode, the first wire connecting the first electrode pattern to any one of the plurality of first lead electrodes, the said. A second wire connecting the second electrode pattern to the other one of the plurality of first lead electrodes, a third wire connecting the third electrode pattern to any one of the plurality of second lead electrodes, said. The fourth wire that connects the fourth electrode pattern to the other one of the plurality of second lead electrodes, the fifth wire that electrically connects the light emitting element to the third electrode pattern , and the thermistor are the fourth. Includes a sixth wire that electrically connects to the electrode pattern
The width of the submount is larger than the width of the temperature control module.
An optical transmitter in which the width of the submount and the width of the temperature control module are the lengths in the second direction perpendicular to the first direction. The temperature control module
The first pad arranged on the support substrate and
The second pad arranged on the first pad and
At least one or more thermoelectric semiconductors arranged between the first pad and the second pad,
The optical transmitter according to claim 1. The optical transmitter according to claim 2, wherein the prism, the light receiving element, and the submount are arranged on the second pad. The optical transmitter according to claim 2, wherein the second pad includes a conductive layer that is electrically connected to the light receiving element. The optical transmitter according to claim 4, wherein the second pad includes an align groove formed on the conductive layer and in which the prism is arranged. The optical transmitter according to claim 1, wherein the difference between the width of the submount and the width of the temperature control module is about 20 mm to 40 mm. The optical transmitter according to claim 1, wherein one side surface and the other side surface of the temperature control module are side surfaces parallel to the first direction. A housing to be bonded to the support substrate and
The optical transmitter according to claim 1, further comprising a lens arranged in the housing and condensing the first light reflected by the inclined surface. With the case
Includes an optical transmitter, an optical receiver, and a receptacle that are inserted into the case.
The optical transmitter
Support board and
A temperature control module arranged on the support substrate and
With the sub-mount placed on the temperature control module,
A prism arranged on the temperature control module and having an inclined surface,
The light receiving element arranged on the temperature control module and
The light emitting element arranged on the submount and
The thermistor placed on the sub mount and
A plurality of first lead electrodes arranged along one side surface of the temperature control module and a plurality of second lead electrodes arranged along the other side surface of the temperature control module are included.
The light receiving element is disposed apart from the submount in the first direction, and the prism is arranged between the light receiving element and the submount.
A part of the first light emitted from the light emitting element is reflected by the inclined surface of the prism, and the rest of the first light passes through the prism and is received by the light receiving element.
The light emitting element includes a first side surface that emits the first light toward the prism and a second side surface that faces the first side surface.
The thermistor is arranged so that one side faces the second side surface of the light emitting element.
The angle formed by one surface of the thermistor and the second side surface of the light emitting element is 25 degrees to 45 degrees.
The submount contains a plurality of electrode patterns arranged on the upper surface.
The plurality of electrode patterns are a first electrode pattern in which the light emitting element is arranged, a second electrode pattern in which the thermistor is arranged, and a third electrode arranged between the first electrode pattern and the second lead electrode. The pattern, the fourth electrode pattern arranged between the second electrode pattern and the second lead electrode, the first wire connecting the first electrode pattern to any one of the plurality of first lead electrodes, the said. A second wire connecting the second electrode pattern to the other one of the plurality of first lead electrodes, a third wire connecting the third electrode pattern to any one of the plurality of second lead electrodes, said. The fourth wire that connects the fourth electrode pattern to the other one of the plurality of second lead electrodes, the fifth wire that electrically connects the light emitting element to the third electrode pattern , and the thermistor are the fourth. Includes a sixth wire that electrically connects to the electrode pattern
The width of the submount is larger than the width of the temperature control module.
An optical module in which the width of the submount and the width of the temperature control module are the lengths in the second direction perpendicular to the first direction. The receptacle comprises an optical fiber to which the first light is coupled.
The optical module according to claim 9, wherein the end face of the optical fiber is inclined. The optical module according to claim 10, wherein the inclination angle of the inclined surface of the prism satisfies the following equation.
_{θ 3 = 45 ° ± θ 1} /2
Here, θ ₃ is the angle of the inclined surface, and θ ₁ is the polishing angle of the end surface of the optical fiber of the receptacle.

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