WO2013105733A1 - 파장 측정 기능을 가지는 파장 가변형 레이저 장치 - Google Patents
파장 측정 기능을 가지는 파장 가변형 레이저 장치 Download PDFInfo
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- WO2013105733A1 WO2013105733A1 PCT/KR2012/010190 KR2012010190W WO2013105733A1 WO 2013105733 A1 WO2013105733 A1 WO 2013105733A1 KR 2012010190 W KR2012010190 W KR 2012010190W WO 2013105733 A1 WO2013105733 A1 WO 2013105733A1
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- wavelength
- laser
- light
- tunable laser
- selective filter
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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
- 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
- H01S5/023—Mount members, e.g. sub-mount members
- H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
-
- 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
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
-
- 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
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
-
- 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
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
Definitions
- the present invention relates to a wavelength tunable laser device, and more particularly, to a wavelength tunable laser capable of measuring wavelengths in a wavelength tunable laser diode package structure for Dense Wavelength Division Multiplexing (DWDM). Relates to a device.
- DWDM Dense Wavelength Division Multiplexing
- the light has very low coherence with each other, and the wavelength division multiplexing (WDM) method of transmitting laser light of various wavelengths using a single optical fiber to a single optical fiber is widely adopted.
- WDM wavelength division multiplexing
- a laser light source capable of emitting a laser light having a fixed wavelength appropriately spaced between adjacent wavelengths is required.
- the interval between wavelengths is gradually narrowing to about 1.6 nm (nano meter) or 0.8 nm or 0.4 nm. Therefore, for the wavelength multiplexing, the wavelength line width of the light source must be very narrow, and the wavelength of the laser light source must be fixed very rigidly with respect to the change of the driving environment of various laser light sources such as temperature and laser driving current. Wavelength precision within 1/4 is required. Therefore, when the wavelength spacing of wavelength multiplexing is 1.6 nm or 0.8 nm or 0.4 nm, the stabilization of the wavelength should be precisely controlled within +/- 0.2 nm, +/- 0.1 nm and +/- 0.05 nm.
- the wavelength tunable laser is a laser device having a structure in which the wavelength can be varied. Such a tunable mechanism can cause wavelength instability. Accordingly, a wavelength measuring method capable of measuring the wavelength of laser light is widely used in the tunable laser. have.
- FIG. 1 shows a butterfly laser package incorporating the existing wavelength stabilizing device cited in Patent No. 10-0871011 registered by the inventor.
- a conventional butterfly package having a device capable of measuring wavelengths in a laser diode package, laser light emitted from one side of the laser diode chip 2 is connected to an optical fiber 9.
- the laser light emitted from the other side of the laser diode chip (2) is collimated and divided into two kinds of light, and then in one path of light, the wavelength selective transmission filter and wavelength whose transmission characteristics vary depending on the wavelength
- a photodiode 6 for monitoring the light intensity transmitted through the selective filter 5 is disposed, and in another path, a photodiode for detecting the intensity of light emitted from the laser diode chip 2 ( 4) Place. Comparing the current flowing through the two photodiodes 6 and 4 arranged in this way, the transmittance through which the laser light passes through the wavelength selective filter 5 is calculated, and the wavelength information of the laser light is obtained from this transmittance.
- optical communication is performed by using laser light emitted from one side of the laser diode chip, and laser light emitted from the other side of the laser diode chip. Use to find out the light output and wavelength of the laser.
- TO can packages are widely used in communication optical modules because of their small manufacturing cost and small size, compared to butterfly packages.
- the light output direction is perpendicular to the stem bottom on which the optical component is placed, so that the light placed on the stem bottom and emitted parallel to the stem bottom is vertically switched using a 45 degree reflection mirror.
- the volume of the optical module it is required to install a large number of optical modules for subscribers in a limited area telephone station by minimizing the volume of the optical module. Accordingly, TO minimize and reduce the volume of the wavelength tunable laser including the wavelength measuring device, TO There is a need for a method of mounting a tunable laser module including a wavelength measuring device in a can type package.
- Fig. 3 shows a TO can type package module having the front light monitoring function of Patent No. 10-09136251 registered by the inventor.
- the TO can package module having the front light monitoring function shown in FIG. 3 may be applied when the intensity of the laser light emitted from one side and the other side of the laser diode chip is a constant ratio.
- a laser diode chip in which one side of the laser diode chip has a reflectance of 0.1% or less such as a reflective semiconductor optical amplifier (RSOA)
- RSOA reflective semiconductor optical amplifier
- the patent proposes a method of directly monitoring the light emitted from the front surface of the laser diode chip by partially transmitting the light emitted from the front surface of the laser diode chip (the direction toward the optical fiber) in a 45 degree reflective mirror.
- Figure 4 is to find out the intensity and wavelength information of the light emitted from the laser by using the laser light emitted to the front and rear of the laser diode chip in the TO can package of Patent No. 10-0871011 registered by the inventor The method is shown. However, this method is a method that can be applied to a distributed feedback laser diode (DFB-LD) chip as mentioned in the inventor's registered patent No. 10-0913625, which is difficult to apply to RSOA.
- DFB-LD distributed feedback laser diode
- one side of the laser diode chip has a reflectance of 0.1% or less and the other side has a reflectance of 10% or more.
- RSOA resonant optical detector
- the present invention has been proposed to solve the problems of the prior art, and an object of the present invention is to configure a device capable of measuring wavelengths in a TO can package in a tunable laser including a TO can package. To provide a tunable laser device that can measure.
- a wavelength tunable laser device having a wavelength measuring function according to the present invention for achieving the above object comprises a laser diode chip for emitting laser light, a collimation lens for collimating the laser light, a wavelength selective filter for transmitting a selected wavelength and
- a wavelength tunable laser device comprising a reflecting mirror having an inclined reflecting surface.
- the first photodiode for photo-sensing is arranged in the path of the light of one branch, and the transmission characteristics of the wavelength are different on the path of the light of the other branch.
- the wavelength selective filter and the second photodiode are further arranged.
- the wavelength selective filter is deposited on one side where the laser light is incident, a reflective surface on which a dielectric thin film is not changed in accordance with the wavelength, and a wavelength selective filter in which the transmission / reflectance is changed depending on the wavelength on the other side. It is preferable that the substrate reflecting surface is formed.
- the wavelength selective filter may include a reflective surface on which a thin film having a transmittance / reflectance is deposited on one side of the laser light incident and a non-reflective surface on the other side.
- the wavelength of the laser light emitted from the laser diode chip is determined by comparing the intensity of the laser light detected through the first photodiode and the second photodiode.
- the laser diode package structure according to the present invention has a very small volume and makes it possible to manufacture a laser module including a wavelength measuring device using a TO-type package which is very inexpensive. This has the effect of lowering volume and price.
- 1 is a conceptual diagram of a butterfly optical module package having a conventional wavelength monitoring function
- FIG. 2 is a conceptual view illustrating a package housing of a conventional TO can optical module
- FIG. 3 is a conceptual diagram of a TO can type optical module having a conventional front monitoring function
- FIG. 4 is a conceptual diagram of a TO can type optical module having a conventional wavelength monitoring function
- FIG. 5 is a conceptual view of a top view of a TO can package of a TO can wavelength tunable laser having a wavelength monitoring function according to the present invention
- FIG. 6 is a conceptual view of a side view of a TO can package of a TO can wavelength tunable laser having a wavelength monitoring function according to the present invention
- FIG. 8 is a diagram illustrating current flowing through two photodiodes according to a wavelength in the structure of FIG. 6;
- FIG. 9 is a conceptual view of a top view of a TO can package according to another embodiment of the present invention.
- FIG. 10 is an embodiment of a wavelength selective filter used in the structure of FIG.
- FIG. 11 is a diagram illustrating an example of a current flowing through two photodiodes according to a wavelength in the structure of FIG. 9.
- FIG. 5 shows a layout view from above of a TO can type laser diode package including a wavelength measuring device in a tunable laser according to the present invention.
- the tunable laser shown in FIG. 5 does not itself operate as a laser package that includes the capability of tunable wavelengths. However, if the device shown in FIG. 5 is provided with a device capable of selecting a specific wavelength from the laser light emitted from the TO can package and returning it back to the laser diode chip, including a portion for selecting the wavelength and returning the laser diode chip. It works with a tunable laser. Selecting a specific wavelength outside the TO can package and returning it to the laser diode chip in the TO can package may be configured by various methods in the related art, and thus, the description thereof will be omitted.
- Figure 6 shows a layout view from the side of the TO can package of FIG.
- the laser light emitted from one side of the laser diode chip 100 is collimated by the collimating lens 200, and then a part of the light is reflected to reflect the TO can. It passes through a 45 degree reflective mirror 300 that emits outside the mold package and transmits a portion of the laser light.
- the 45-degree reflective mirror 300 reflects a predetermined ratio of light to the outside of the TO can package irrespective of the wavelength, and the predetermined ratio of light passes through the 45-degree reflective mirror 300. .
- the light transmitted through the 45 degree reflective mirror 300 is divided into at least two or more branches of light by the wavelength selective filter 400.
- the wavelength selective filter 400 includes a reflective surface having a structure in which a substrate (for example, glass or quartz) transparent to laser light is laminated with a dielectric thin film whose transmittance / reflectance does not change with wavelength. 410, and a substrate reflecting surface 420 on which a wavelength selective filter whose transmittance / reflectance varies depending on the wavelength is deposited. Therefore, the light reaching the reflective surface 410 of the wavelength selective filter 400 is divided into a transmission component and a reflection component.
- a substrate for example, glass or quartz
- the light passing through the reflective surface 410 is transmitted through the substrate reflective surface 420 according to the transmission ratio determined according to the wavelength in the substrate reflective surface 420, which is the other side of the wavelength selective filter 400. Proceeding to the second photodiode 520 for intensity monitoring. The light reflected from the one reflective surface 410 of the wavelength selective filter 400 is reflected at a constant ratio regardless of the wavelength and then proceeds to the first photodiode 510 for monitoring the light intensity.
- the intensity of the photocurrent flowing to the two photodiodes 520 and 510 of the TO can type package it is possible to determine the ratio of the light passing through the one side substrate reflecting surface 420 of the wavelength selective filter 400.
- the wavelength of light can be known by comparing the transmittance with the transmittance according to a predetermined wavelength.
- the light intensity is determined using the current flowing through the first photodiode 510, and the current flowing through another second photodiode 520 is transferred to the first photodiode 510.
- the current flowing through another second photodiode 520 is transferred to the first photodiode 510.
- a wavelength tunable laser having a wavelength monitoring function can be manufactured using a TO can package.
- the TO can type laser diode package including the wavelength measuring device in the tunable laser according to the present invention may be implemented in various compositions, and FIG. 9 shows another embodiment of the present invention.
- a TO can type having a wavelength monitoring function in the case of depositing a wavelength selective filter whose transmission / reflection ratio varies depending on the wavelength on one side of the wavelength selective filter 600 is shown. Shows the appearance of a tunable laser.
- FIG. 10 shows a detailed structural diagram of the wavelength selective filter shown in FIG.
- one side of the reflective surface 610 of the wavelength selective filter 600 according to another exemplary embodiment of the present invention is deposited with a thin film having a characteristic of varying transmission / reflectance according to wavelength.
- the other side 620 of 600 is preferably anti-reflective coating.
- the transmission / reflection ratio of the one reflective surface 610 of the wavelength selective filter 600 is changed according to the wavelength of the laser light.
- two photodiodes 510 are used.
- a diagram comparing the current flowing through 520 is shown.
- the sum of the currents flowing to the two photodiodes 510 and 520 is proportional to the intensity of the laser light emitted from the laser diode chip 100 and thus the two photodiodes 510 and 520.
- the wavelength of the laser light can be determined from the ratio of the current flowing through
- the present invention can determine the wavelength of the laser light by detecting and comparing the intensity of the light transmitted through the filter with the light reflected by the wavelength selective filter whose transmittance varies depending on the wavelength of the laser light input. do.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims (4)
- 레이저 빛을 방출하는 레이저 다이오드 칩과, 레이저 빛을 시준화하는 시준화 렌즈와, 선택된 파장을 투과시키는 파장 선택성 필터와, 경사진 반사면을 갖는 반사거울을 포함하는 TO can형 파장 가변형 레이저 장치에 있어서.상기 레이저 다이오드 칩(100)에서 방출되어 시준화 렌즈(200)에 의해 시준화 된 후 45도 반사거울(300)을 통하여 TO can형 패키지 외부로 방출되는 빛과 45도 반사거울(300)을 투과하는 성분으로 빛을 분리 한 후,상기 45도 반사거울(300)을 투과한 빛을 적어도 두 갈래의 빛으로 분할한 후 한 갈래의 빛의 경로에 광감시를 위한 제 1 포토 다이오드(510)를 배치하고, 다른 한 갈래의 빛의 경로 상에 파장에 따른 투과 특성이 달라지는 파장 선택성 필터(400)(600)와 제 2 포토 다이오드(520)가 더 배치된 것을 특징으로 하는 파장 측정 기능을 가지는 파장 가변형 레이저 장치.
- 제 1항에 있어서,상기 파장 선택성 필터(400)에는상기 레이저 빛이 입사되는 일측면에 파장에 따라 투과/반사율이 바뀌지 않는 유전체 박막이 적층된 반사면(410)과, 타측면에 파장에 따라 투과/반사율이 달라지는 파장 선택성 필터가 증착된 기판 반사면(420)이 형성되는 것을 특징으로 하는 파장 측정 기능을 가지는 파장 가변형 레이저 장치.
- 제 1항에 있어서,상기 파장 선택성 필터(600)에는상기 레이저 빛이 입사되는 일측면에 파장에 따라 투과/반사율이 달라지는 박막이 증착된 반사면(610)과, 타측면에 무반사면(620)이 형성된 것을 특징으로 하는 파장 측정 기능을 가지는 파장 가변형 레이저 장치.
- 제 1항 내지 제 3항 중 어느 한 항의 파장 가변형 레이저 장치에서,상기 제 1 포토 다이오드(510)와 제 2 포토 다이오드(520)를 통하여 감지되는 레이저 빛의 세기를 비교하여, 상기 레이저 다이오드 칩(100)에서 방출되는 레이저 빛의 파장을 결정하는 것을 특징으로 하는 파장 가변형 레이저 장치의 파장 측정 방법.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2014552114A JP2015503855A (ja) | 2012-01-13 | 2012-11-28 | 波長測定機能を有する波長可変型レーザー装置 |
US14/372,019 US9325154B2 (en) | 2012-01-13 | 2012-11-28 | Wavelength-tunable laser apparatus having wavelength measuring function |
CN201280066954.1A CN104040810B (zh) | 2012-01-13 | 2012-11-28 | 具有波长测量功能的波长可变激光装置 |
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KR10-2012-0004538 | 2012-01-13 | ||
KR20120004538 | 2012-01-13 | ||
KR10-2012-0020765 | 2012-02-29 | ||
KR1020120020765A KR101943050B1 (ko) | 2012-01-13 | 2012-02-29 | 파장 측정 기능을 가지는 파장 가변형 레이저 장치 |
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Cited By (3)
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CN105207056A (zh) * | 2014-05-30 | 2015-12-30 | 光速株式会社 | 具有折弯的光导波路的外部谐振器型激光器 |
CN105431989A (zh) * | 2013-07-30 | 2016-03-23 | 光速株式会社 | 内置波长测定装置的外部谐振器型激光器 |
WO2016175595A1 (ko) * | 2015-04-29 | 2016-11-03 | (주)켐옵틱스 | 도파로 브래그 격자를 사용한 파장 가변 광수신기 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105431989A (zh) * | 2013-07-30 | 2016-03-23 | 光速株式会社 | 内置波长测定装置的外部谐振器型激光器 |
CN105431989B (zh) * | 2013-07-30 | 2019-01-08 | 光速株式会社 | 内置波长测定装置的外部谐振器型激光器 |
CN105207056A (zh) * | 2014-05-30 | 2015-12-30 | 光速株式会社 | 具有折弯的光导波路的外部谐振器型激光器 |
WO2016175595A1 (ko) * | 2015-04-29 | 2016-11-03 | (주)켐옵틱스 | 도파로 브래그 격자를 사용한 파장 가변 광수신기 |
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