KR20120056480A - module for bi-directional optical transceiver and TO-can package used the same - Google Patents

module for bi-directional optical transceiver and TO-can package used the same Download PDF

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Publication number
KR20120056480A
KR20120056480A KR1020100118044A KR20100118044A KR20120056480A KR 20120056480 A KR20120056480 A KR 20120056480A KR 1020100118044 A KR1020100118044 A KR 1020100118044A KR 20100118044 A KR20100118044 A KR 20100118044A KR 20120056480 A KR20120056480 A KR 20120056480A
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KR
South Korea
Prior art keywords
laser light
transmitter
filter
degrees
receiver
Prior art date
Application number
KR1020100118044A
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Korean (ko)
Inventor
이종진
Original Assignee
한국전자통신연구원
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Priority to KR1020100118044A priority Critical patent/KR20120056480A/en
Publication of KR20120056480A publication Critical patent/KR20120056480A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/02208—Mountings; Housings characterised by the shape of the housings
    • H01S5/02212—Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The present invention discloses a bidirectional optical transmission / reception module and a thiocan package thereof, which can be miniaturized and meet the international standard of low density wavelength division multiplexing. The module includes a receiver for receiving a first laser light, a transmitter for transmitting a second laser light having a different wavelength from the first laser light, transmitting the first laser light between the transmitter and the receiver, And a filter for reflecting the second laser light in a direction opposite to the first laser light. Here, the transmitter may enter the second laser light into the filter at an angle of incidence from 20 degrees or less to 0 degrees or more.

Description

Bi-directional optical transceiver and its thio-can package {module for bi-directional optical transceiver and TO-can package used the same}

The present invention relates to an optical communication device, and more particularly, to a bidirectional optical transmission module and a thio-can package thereof.

Optical network units (ONUs) and optical line terminals (OLTs) of passive optical networks (PON), such as Gigabit PON (GPON), Ethernet PON (EPON), and Wavelength Division Multiplexing PON (WDMPON), It may include a transmitter. The bidirectional optical transmission / reception module is an optical communication device in which a receiver and a transmitter are packaged as one. However, since the conventional bidirectional optical transmission / reception module uses a channel having a wide wavelength interval, there is a problem in that it cannot be developed in accordance with international standard such as low density wavelength division multiplexing (CWDM) that pursues bidirectional communication with a wavelength interval of 20 nm. In addition, the conventional bidirectional optical transmission and reception module has a disadvantage in miniaturization because a reflector is essentially used between the receiver and the transmitter.

One technical problem to be achieved by the present invention is to provide a bidirectional optical transmission module and a thiocan package thereof in accordance with the international standard for low density wavelength division multiplexing.

Another object of the present invention is to provide a bidirectional optical transmission module and a thiocan package thereof that can be miniaturized.

In order to achieve the above technical problem, the bi-directional optical transmission and reception module may include a transmitter for injecting laser light into the filter at an angle of incidence of 20 degrees or less. Its module includes a receiver for receiving a first laser light; A transmitter for transmitting a second laser light having a wavelength different from that of the first laser light; And a filter that transmits the first laser light between the transmitter and the receiver and reflects the second laser light in a direction opposite to the first laser light. Here, the transmitter may enter the second laser light into the filter at an incident angle of 20 degrees or less.

According to an embodiment of the present invention, the filter may include a wavelength division multiplex filter.

According to one embodiment of the invention, the transmitter may comprise a laser diode.

According to an embodiment of the present invention, the laser diode includes a substrate, a buffer layer formed on the substrate, a lower electrode formed on the buffer layer, an active layer formed on the lower electrode, and on the active layer. It may include an upper electrode formed.

According to an embodiment of the present invention, the active layer and the upper electrode may have a thickness within 10 micrometers.

According to an embodiment of the present invention, the light emitting unit and the resonance unit may be further formed on opposite sidewalls of the active layer.

According to one embodiment of the invention, the exit portion may comprise an antireflective coating.

According to an embodiment of the present invention, the emission unit may output the second laser light at a radiation angle of 5 degrees to 10 degrees.

According to one embodiment of the invention, the resonator may comprise a reflective coating.

According to another embodiment of the present invention, a thiocan package of a bidirectional optical transmission / reception module may include a stem; A receiver receiving a first laser light on said stem; An inclined plate formed on said stem adjacent said receiver; A transmitter formed on the inclined plate and transmitting a second laser light having a wavelength different from that of the first laser light; And a filter that transmits the first laser light between the transmitter and the receiver and reflects the second laser light in a direction opposite to the first laser light. Here, the transmitter may enter the second laser light into the filter at an incident angle of 20 degrees or less.

According to another embodiment of the invention, the transmitter may comprise a laser diode.

According to another embodiment of the present invention, the inclined plate may fix the laser diode at an inclination angle of 80 degrees or more.

According to another embodiment of the present invention, it may further include at least one lead pin for fixing the inclined plate.

According to another embodiment of the present invention, a focusing lens for injecting the first laser light into the filter, focusing the second laser light reflected from the filter, and fixing the focusing lens on the transmitter and the receiver It may further include a cap.

As described above, according to the exemplary embodiment of the present invention, the transmitter may enter the laser light into the wavelength division multiplex filter at an incident angle of 20 degrees or less. The wavelength division multiplex filter may separate the transmission laser light and the reception laser light in a guard band corresponding to a wavelength gap of 20 nm. Therefore, the bidirectional optical transmission module can be used in the international standard for low density wavelength division multiplexing. In addition, the bidirectional optical transmission / reception module can be miniaturized since the conventional reflector can be removed.

1 is a view schematically showing a thiocan package of a bidirectional optical transmission and reception module according to an embodiment of the present invention.
2A and 2B are graphs showing first and second guard bands according to the angle of incidence of a filter.
3 are graphs showing first and second guard bands corresponding to changes in wavelength spacing and reflectance.
4 is a sectional view of the transmitter of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in different forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art, and the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms 'comprises' and / or 'comprising' mean that the stated element, step, operation and / or element does not imply the presence of one or more other elements, steps, operations and / Or additions. In addition, since they are in accordance with the preferred embodiment, the reference numerals presented in the order of description are not necessarily limited to the order.

1 is a view schematically showing a thiocan package of a bidirectional optical transmission / reception module according to an embodiment of the present invention, and FIGS. 2A and 2B show first and second guard bands a and b according to the angle of incidence of a filter. 3 are graphs showing first and second guard bands a and b corresponding to changes in wavelength spacing and reflectance, and FIG. 4 is a cross-sectional view of the transmitter of FIG. 1.

1 to 4, the thiocan package of the bidirectional optical transmission / reception module according to the embodiment of the present invention transmits the first laser light 22 received by the receiver 20 and is transmitted by the transmitter 30. It may include a filter 40 for reflecting the second laser light 32 in the same direction as the first laser light 22. The filter 40 has a guard band corresponding to the wavelength difference between the first laser light 22 and the second laser light 32 as the incident angles θ of the first and second laser lights 22 and 32 decrease. Can be reduced. For example, the filter 40 may separate the first and second laser lights 22 and 32 incident at an incident angle θ of 20 degrees in the first guard band a of about 20 nm. The filter 40 may separate the first and second laser lights 22 and 32 incident at the incident angle θ of 45 degrees in the second guard band b of about 70 nm. The transmitter 30 may enter the second laser light 32 into the filter 40 at an incident angle θ from 20 degrees or less to 0 degrees or more. The first guard band (a) corresponding to the wavelength interval of 20 nm is used in the international telecommunications union as an international standard of low density wavelength division multiplexing (CWDM: Coarse Wavelength Division Multiplexing, ITU-T G.694.2). Therefore, the thiocan package of the bidirectional optical transmission / reception module according to the embodiment of the present invention can be used in the low density wavelength division multiplexing method of the international standard, and can be miniaturized.

The stem 10 may include through holes 17 passing through the first and second lead pins 12 and 13. The first and second lead pins 12, 13 may be fixed at the stem 10 by a sealant 15.

Receiver 20 may be disposed on stem 10. The receiver 20 may receive the first laser light 22 transmitted through the filter 40 and convert it into an electrical signal. For example, the receiver 20 may include a first photodiode. An amplifier 24 may be placed on the stem 10 adjacent to the receiver 20. The amplifier 24 may amplify the signal output from the receiver 20. The amplifier 24 and the first lead pin may be connected to a first wire (not shown).

Cover 14 may be disposed on receiver 20 and amplifier 24. The cover 14 may block light flowing from the outside in addition to the first laser light 22 transmitted from the filter 40. In addition, the cover 14 may protect the receiver 20 and the amplifier 24 from electrical or mechanical influences. The cover 14 may fix the filter 40 and the first focusing lens 26.

The filter 40 may be parallel to the top surface of the stem 10. The filter 40 may be disposed between the receiver 20 and the transmitter 30. The filter 40 may include a wavelength division multiplex (WDM) filter such as a polarization reflecting filter, a multilayer thin film filter, or a semi-transmissive filter. Although not shown, the wavelength division multiplex filter may include a transmissive substrate that transmits the first laser light 22 and a thin film type that reflects the second laser light 32 on the transmissive substrate. The film may transmit and reflect the first and second laser lights 22 and 32, respectively, in a high density wavelength division multiplexing method and a low density wavelength division multiplexing method. For example, high density wavelength division multiplex films can be used at temperatures below minus 200 degrees. On the other hand, the low density wavelength division multiplex film may reflect the second laser light 32 when the second laser light 32 is incident at 20 degrees or less at room temperature.

In the wavelength division multiplex filter, a guard band corresponding to a wavelength difference between the first and second laser lights 22 and 32 may be determined according to an incident angle θ at which the first and second laser lights 22 and 32 are incident. Can be. The first and second laser lights 22 and 32 may be incident on the filter 40 at the same incident angle θ. The guard band may correspond to the wavelength interval. The incident angle θ of the first and second laser lights 22 and 32 and the guard band may be proportional to each other. For example, the filter 40 has the first and second laser lights 22 having a wavelength interval of about 70 μm or more when the incident angles θ of the first and second laser lights 22, 32 are 45 degrees. , 32). The filter 40 may transmit the first laser light 22 having a predetermined wavelength and reflect the second laser light 24 having a wavelength interval of about 70 μm or more from the first laser light 22.

The filter 40 filters the first and second laser lights 22 and 32 having a wavelength interval of about 20 μm or more when the incident angles θ of the first and second laser lights 22 and 32 are 20 degrees. Can be separated. The filter 40 may transmit the first laser light 22 and reflect the second laser light 24 having a wavelength interval of about 20 μm or more from the first laser light 22. When the first and second laser lights 22 and 32 are incident at an angle of incidence θ of 20 degrees or less, the filter 40 can realize bidirectional transmission and reception of a low density wavelength division multiplexing method. Therefore, the thiocan package of the bidirectional optical transmission / reception module according to the embodiment of the present invention can be used in the low density wavelength division multiplexing system of the international standard.

The second laser light 32 may be incident on the filter 40 at an incident angle θ of 20 degrees or less in the transmitter 30 fixed to the inclined plate 36. The inclined plate 36 may be disposed on one side of the receiver 20 opposite to the amplifier 24. The inclined plate 36 may be fixed by the second lead pin 13. The second lead pin 13 and the transmitter 30 may be connected by a second wiring (not shown). The inclined plate 36 may fix the transmitter 30 and the transmission monitoring unit 34. The inclined plate 36 may fix the transmitter 30 at an inclination angle of 80 degrees or more. The inclined plate 36 may have an inclined surface 38 for fixing the transmitter 30 at an inclination angle corresponding to the incidence angle θ of the second laser light 32 transmitted from the transmitter 30.

The transmitter 30 may include a laser diode. The transmission monitoring unit 34 may include an optical sensor such as a second photodiode. The second photodiode may convert light energy into electrical energy. The transmission monitoring unit 34 may monitor the output of the second laser light 32 of the transmitter 30.

The second laser light 32 may be incident on the filter 40 at the transmitter 30 and reflected from the filter 40 to the second focusing lens 52. The second laser light 32 may be reflected in the filter 40 in the opposite direction to the first laser light 22. The second focusing lens 52 may inject the second laser light 32 into the optical fiber 50. The bifocal lens 52 may inject the first laser light 22 transmitted from the optical fiber 50 to the filter 40. The second focusing lens 52 may be disposed in the cap 16 fixed to the stem 10. The first and second laser lights 22, 32 may travel in opposite directions between the filter 40 and the optical fiber 50.

Meanwhile, the laser diode of the transmitter 30 includes a substrate 60, a buffer layer 62 formed on the substrate 60, a lower electrode 64 formed on the buffer layer 62, and the lower electrode. The active layer 66 formed on the 64 and the upper electrode 68 formed on the active layer 66 may be included.

The active layer 66 may oscillate the second laser light 32 by a power supply voltage applied from the upper and lower electrodes 68 and 64. The active layer 66 may include gallium arsenide or gallium arsenide. The laser diode may include an emission unit 70 and a resonance unit 72 formed on opposite sidewalls of the active layer 66, respectively. The resonator 72 may resonate the second laser light 32 oscillated from the active layer 66. The resonator 72 may resonate the second laser light 32 with constructive interference. The resonator 72 may reflect the second laser light 32. The resonator 72 may include a reflective coating. The reflective coating may reflect about 90% of the second laser light 32. The reflective coating may transmit about 10% of the second laser light 32 to the transmission monitoring unit 34. The emitter 70 may pass the second laser light 72 reflected by the resonator 72. The exit unit 70 may include an antireflective coating. The exit unit 70 may be disposed within about 10 μm of the upper surface of the upper electrode 68. The second laser light 32 may be output at the divergence angle Φ of about 5 degrees to about 10 degrees from the emission unit 70.

The exit unit 70 may have the same level as the active layer 66 from the substrate 60. The thickness of the active layer 66 and the upper electrode 68 may be related to the incident angle θ of the second laser light 32. For example, the thickness of the active layer 66 and the upper electrode 68 may be proportional to the incident angle θ of the second laser light 32. When the thickness of the emission unit 70 and the upper electrode 68 is reduced, the incident angle θ of the second laser light 32 may be reduced.

The upper electrode 68 may be formed to a thickness that may not interfere with the path of the second laser light 32 reflected from the filter 40. The upper electrode 68 may have a thickness of less than about 10 μm.

When the exit portion 70 and the upper electrode 68 have a distance of 10 μm or less from the upper surface, the light exit portion 70 and the upper electrode 68 are brought closer to the filter 40 at an angle of incidence of 20 degrees or less of the second laser light 32 to about 3 μm or more. Can be arranged. Accordingly, the emission unit 66 may be disposed within a predetermined distance from the upper surface of the housing 70 to remove at least one reflector that conventionally reflects the laser light.

Therefore, the thiocan package of the bidirectional transmission and reception module according to the embodiment of the present invention can be miniaturized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

10: stem 20: receiver
30: transmitter 40: filter
50: optical fiber 60: substrate
70: exit

Claims (14)

A receiver for receiving a first laser light;
A transmitter for transmitting a second laser light having a wavelength different from that of the first laser light; And
A filter that transmits the first laser light between the transmitter and the receiver and reflects the second laser light in a direction opposite to the first laser light,
And the transmitter is incident on the filter at an incident angle of 20 degrees or less to 0 degrees or more. The method of claim 1,
The filter comprises a wavelength division multiplex filter. The method of claim 2,
The transmitter comprises a laser diode bidirectional optical transmission module. The method of claim 3, wherein
The laser diode includes a substrate, a buffer layer formed on the substrate, a lower electrode formed on the buffer layer, an active layer formed on the lower electrode, and an upper electrode formed on the active layer. module. The method of claim 4, wherein
And the active layer and the upper electrode have a thickness within 10 micrometers. The method of claim 4, wherein
And a emitter and a resonator formed on opposite sidewalls of the active layer. The method according to claim 6,
The exit portion is a bidirectional optical transmission module including an anti-reflective coating. The method of claim 7, wherein
The emission unit is a bidirectional optical transmission module for outputting the second laser light at a radiation angle of 5 degrees to 10 degrees. The method according to claim 6,
The resonator bidirectional optical transmission module including a reflective coating. Stem;
A receiver receiving a first laser light on said stem;
An inclined plate formed on said stem adjacent said receiver;
A transmitter formed on the inclined plate and transmitting a second laser light having a wavelength different from that of the first laser light; And
A filter that transmits the first laser light between the transmitter and the receiver and reflects the second laser light in a direction opposite to the first laser light,
The transmitter is a thiocan package of a bi-directional optical transmission module for the second laser light incident on the filter at an angle of incidence from less than 20 degrees to more than 0 degrees. 11. The method of claim 10,
The transmitter is a thiocan package of a bi-directional optical transmission and reception module including a laser diode. The method of claim 11,
The inclined plate is a thiocan package of a two-way optical transmission module for fixing the laser diode at an inclination angle of 80 degrees or more. The method of claim 12,
The thio can package of the bidirectional optical transmitting and receiving module further comprising at least one lead pin for fixing the inclined plate. 11. The method of claim 10,
A focusing lens for injecting the laser light into the filter and focusing the second laser light reflected from the filter, and a cap fixing the focusing lens on the transmitter and the receiver. Cans package.
KR1020100118044A 2010-11-25 2010-11-25 module for bi-directional optical transceiver and TO-can package used the same KR20120056480A (en)

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KR1020100118044A KR20120056480A (en) 2010-11-25 2010-11-25 module for bi-directional optical transceiver and TO-can package used the same

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9276376B2 (en) 2013-11-08 2016-03-01 Electronics And Telecommunications Research Institute Laser module
US9768583B2 (en) 2015-11-04 2017-09-19 Electronics And Telecommunications Research Institute Multi-channel optical module and manufacture method thereof
US10110338B2 (en) 2016-06-24 2018-10-23 Electronics And Telecommunications Research Institute Apparatus and method for detecting optical signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9276376B2 (en) 2013-11-08 2016-03-01 Electronics And Telecommunications Research Institute Laser module
US9768583B2 (en) 2015-11-04 2017-09-19 Electronics And Telecommunications Research Institute Multi-channel optical module and manufacture method thereof
US10110338B2 (en) 2016-06-24 2018-10-23 Electronics And Telecommunications Research Institute Apparatus and method for detecting optical signal

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