WO2004068222A1 - 光モジュール - Google Patents
光モジュール Download PDFInfo
- Publication number
- WO2004068222A1 WO2004068222A1 PCT/JP2003/016877 JP0316877W WO2004068222A1 WO 2004068222 A1 WO2004068222 A1 WO 2004068222A1 JP 0316877 W JP0316877 W JP 0316877W WO 2004068222 A1 WO2004068222 A1 WO 2004068222A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- input
- wavelength
- prism
- input light
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/33—Acousto-optical deflection devices
Definitions
- the present invention relates to an optical module.
- the present invention relates to an optical module that outputs output light obtained by diffracting input light input from the outside by an acousto-optic element.
- the exit angle of the acousto-optic element that emits the diffracted light varies depending on the wavelength of the incident light that enters the acousto-optic element. For this reason, in the above configuration, when the collimating lens is arranged at the optimum relative position and relative angle for the input light of a certain wavelength with respect to the acousto-optic element, the output when the input light of a different wavelength is input There was a problem that light loss increased.
- An acousto-optic element that emits light at different emission angles according to the wavelength of the input light, and a first correction light that emits first output light with a reduced difference in the emission angle according to the wavelength of the diffracted light.
- An optical module comprising: a prism. The first correction prism deflects the diffracted light in a direction further away from the optical path of undiffracted light emitted without being diffracted among the input light incident on the acousto-optic element. Light may be emitted.
- the apparatus may further include a first lens that outputs the first output light to an optical fiber connected to the optical module.
- the input light is incident on the acousto-optic element at an angle at which the diffraction efficiency by the acousto-optic element becomes higher.
- An incident prism may be further provided.
- the incident prism may be configured to deflect the input light to an incident angle substantially equal to a Bragg diffraction angle with respect to the acousto-optical element, which is determined according to the wavelength of the input light, and to make the incident light incident on the acousto-optical element. Good.
- the input prism which is incident on the acousto-optic element by the incidence prism, changes the incident light according to the wavelength of the input light in the undiffracted light emitted from the acousto-optic element without being diffracted.
- a second correction prism that emits second output light having a reduced angle difference as compared with the undiffracted light may be further provided.
- the first correction prism may emit the first output light in which the difference in the emission angle of the diffracted light according to the wavelength is corrected to substantially zero.
- an optical module for outputting an output light obtained by diffracting an input light input from the outside, wherein the diffracted light obtained by diffracting the input light is changed according to a wavelength of the input light.
- An acousto-optic element that emits light at different emission angles, and the input light is made incident, and emitted at different angles according to the wavelength of the input light, so that the diffraction efficiency of the acousto-optical element becomes greater.
- an incidence prism for causing the acousto-optic element to enter the acousto-optic element at an increased angle.
- FIG. 1 shows a configuration of an optical module 100 according to an embodiment of the present invention.
- FIG. 2 is a graph showing an example of the diffraction efficiency of the acousto-optic device 120 according to the embodiment of the present invention.
- FIG. 3 is a graph showing an example of the coupling loss in the first output lens 145 and the second output lens 155 according to the embodiment of the present invention.
- FIG. 4 is a graph showing an example of the insertion loss of the first output light by the optical module 100 according to the embodiment of the present invention.
- FIG. 5 is a graph showing a comparison result between the insertion loss of the first output light by the optical module 100 according to the embodiment of the present invention and the insertion loss by another method.
- FIG. 6 is a graph showing a difference in the input loss between the first output light and the second output light by the optical module 100 according to the embodiment of the present invention.
- FIG. 1 shows a configuration of an optical module 100 according to the present embodiment.
- the optical module 100 outputs the first output light obtained by diffracting the input light input from the outside via the input optical fiber 105 by the acousto-optic element 120 to the first output optical fiber 110.
- the second output light of the input light that is not diffracted by the acousto-optic element 120 is output to the second output optical fiber 115.
- the optical module 100 according to the present embodiment adjusts the incident angle at which the input light enters the acousto-optic element 120 according to the wavelength of the input light, and varies according to the wavelength of the input light.
- An object of the present invention is to adjust the output angle of the diffracted light emitted from the acousto-optic element 120 by the angle, and to reduce the change in the loss of the output light when the wavelength of the input light is different.
- the optical module 100 includes an input lens 130, an entrance prism 135, an acousto-optic element 120, a first correction prism 140, a first output lens 144, and a second correction. Step It has a rhythm 150 and a second output lens 150.
- the input lens 130 corrects the input light input through the input optical fiber 105 into substantially parallel input light.
- the input prism 135 receives the input light captured by the input lens 130, and emits the light at different angles according to the wavelength of the input light.
- the input prism 1 35 deflects the input light corrected by the input lens 130 in a direction closer to the direction of the acousto-optic element 120, and deflects the input light into the acousto-optic element 120.
- the incident angle 0 2 may be made closer to 0. In this case, the argument 0 i becomes smaller when the wavelength of the input light is longer than when the wavelength of the input light is shorter.
- the incident prism 135 causes the input light corrected by the input lens 130 to enter the acousto-optic element 120 at an angle at which the diffraction efficiency of the acousto-optic element 120 becomes higher.
- Acoustooptic element 1 2 0 was diffract input light diffracted light, emitted to the first correcting prism 1 4 0 at the exit angle 0 3 that different depending on the wavelength of the input light. More specifically, the acousto-optic element 120 diffracts the input light incident from the incident prism 135 due to the periodic density of the distortion generated by the ultrasonic wave applied by the oscillator 125, for example, T e 0 2 , L i N b 0 3 , or Pb Mo 0 4 .
- the emission angle theta 3 when the wavelength of the input light is long, increases compared with the case the wavelength of the input light shorter.
- the acousto-optic element 120 emits, to the second correction prism 150, the undiffracted light that is not diffracted by the acousto-optic element 120 out of the input light that has entered the incidence prism 135.
- First ToTadashi prism 1 4 0 is incident diffracted light emitted from the acoustooptic element 1 2 0, emits a first output light to reduce the difference in emission angle theta 3 corresponding to the wavelength of the diffracted light . More specifically, the first correcting prism 1 4 0, the diffracted light emitted by the acoustic optical element 1 2 0, the deflection angle theta 4 deflect to a more distant direction from the ultrasonic wave 1 6 0 diffracted light occurs The emitted first output light is emitted.
- the first correction prism 140 deflects the diffracted light in a direction further away from the optical path of the undiffracted light that is emitted without being diffracted among the input light incident on the acousto-optic element 120. 1 Emit output light.
- the emission angle ⁇ ⁇ 3 of the diffracted light is larger than when the wavelength of the input light is shorter.
- the first correction prism 1 4 0 deflects the diffracted light wavelength of the input light is emitted at a large emission angle theta 3 optionally longer into smaller deflection angle theta 4 only outgoing angle 0 3 and same direction.
- the first correction prism 140 can reduce the difference in the outgoing angle according to the wavelength in the diffracted light emitted from the acousto-optic element 120.
- the first capturing prism 140 has a vertex angle such that the sum of the emission angle ⁇ 3 and the deflection angle ⁇ 4 becomes substantially zero in the wavelength range of the input light in which the optical module 100 is used. May be provided.
- the first correction prism 140 can emit the first output light in which the difference in the emission angle according to the wavelength of the diffracted light emitted from the acousto-optic element 120 has been corrected to substantially zero. it can.
- the first correction prism 140 deflects the diffracted light further away from the optical path of the undiffracted light, so that the distance between the first output lens 144 and the second output lens 155 is increased.
- the separation can be made larger.
- the first output lens 144 outputs the first output light deflected by the first correction prism 140 to the first output optical fiber 110 connected to the optical module 100.
- the second collection prism 150 compares the difference in the angle of the undiffracted light emitted from the acousto-optic element 120, which is changed according to the wavelength of the input light, with the undiffracted light. Then, the reduced second output light is emitted. More specifically, the second correction prism 150 moves the undiffracted light emitted from the acousto-optic element 120 farther from the ultrasonic wave front 160 where the diffracted light of the incident light is generated. emitting a second emission light is polarized angle theta 5 deflection direction.
- the second correction prism 150 deflects the undiffracted light in a direction further away from the optical path of the diffracted light that is diffracted and emitted from the input light incident on the acousto-optic element 120.
- the second output light is emitted.
- the deflection angle theta 5 is compared with the case the wavelength of the non-diffracted light passed through the acoustooptic element 1 2 0 without being diffracted out of the modified input light is long, when the wavelength of the non-diffracted light is short small . Therefore, the second correction prism 1 5 0 deflects optionally only a smaller deflection angle theta 5 diffracted light Isa out with large small deflection angle theta i wavelength of the input light is long, the deflection angle theta lambda in the opposite direction .
- the second correction prism 150 reduces the difference in the outgoing angle of the undiffracted light emitted from the acousto-optic element 120 changed by the incident prism 135 according to the wavelength of the input light. be able to.
- the second correcting prism 1 5 it to the optical module 1 0 0 wavelength range of the input light used les, Te, an apex angle as the polarization angle of 0 5 and the polarization angle of 0 i is substantially the same May have.
- the second correction prism 150 approximates the difference in the outgoing angle of the undiffracted light emitted from the acousto-optic element 120, which is changed by the input prism 135 according to the wavelength of the input light. It can be corrected to zero.
- the second correction prism 150 deflects the diffracted light in a direction away from the optical path of the diffracted light, thereby increasing the distance between the second output lens 155 and the first output lens 145. Can be increased.
- FIG. 2 is a graph showing an example of the diffraction efficiency of the acousto-optic device 120 according to the present embodiment. More specifically, P b M o 0 4 in the case of applying an ultrasonic wave of 1 5 0 MH z to the acousto-optic device 1 2 0 by the diffraction efficiency when the wavelength of the input light is 1 5 7 0 nm 4 shows the wavelength dependence of the diffraction efficiency when input light is made incident on the acousto-optic device 120 at an incident angle at which the maximum is obtained.
- the optical module 100 includes an incident prism 135 that corrects an incident angle at which input light is incident on the acousto-optic element 120 in order to reduce the wavelength dependence of diffraction efficiency.
- the black diffraction angle ⁇ B which is the incident angle at which the diffraction efficiency is maximized, is expressed by the following equation (1) Is approximated by
- the change amount of the deviation angle ⁇ ⁇ , ⁇ , ( ⁇ )- ⁇ , (X c ) by the incident prism 135 when the input light of the wavelength different from the center wavelength;
- the material of the entrance prism 135 or the apex angle of the entrance prism 135 is adjusted so that is approximately the same.
- FIG. 3 is a graph showing an example of the coupling loss in the first output lens 145 and the second output lens 155 according to the present embodiment. More specifically, Fig. 3 shows the experimental results of the optical coupling loss when light is incident on a certain collimating lens at different incident angles. It is shown by the relative value to the optical coupling loss in the case of the above.
- the incident angle of light in the crystal of the acousto-optic element 120 is ⁇
- the refractive index of the acousto-optic element 120 is Assuming that ⁇ , can be expressed by the following equation (2).
- Equation (2) can be transformed into equation (3).
- the wavelength range of the input light shall be the 1 five hundred twenty to one 6 20 nm It can be calculated that an angle change of about 0.13 degrees occurs.
- the wavelength dependence of the coupling loss reaches about 1 dB or more in the wavelength range of 1520 to 1620 nm.
- the first collection prism 140 can correct the difference in the emission angle according to the wavelength of the diffracted light emitted from the acousto-optic element 120 to substantially zero.
- ⁇ in the above equation (3) and ⁇ 2 in the equation (4) are the angles at which the input light enters the optical module 100 from the input optical fiber 105 when the incident prism 135 is not provided. It is a fixed value based on On the other hand, when the incident prism 135 is provided, these values change so that the value of Hi becomes a black diffraction angle determined according to the wavelength of the input light.
- the first correction prism 140 reduces the difference between the exit angles according to the wavelengths of the diffracted light generated by the incident prism 135 and the acousto-optic element 120 as compared with the diffracted light, or makes the difference substantially zero.
- the material or apex angle may be adjusted as described.
- the first auxiliary As the positive prism 140 a prism made of flint glass (F2) and having an apex angle of 60 to 70 degrees, more preferably approximately 64 degrees can be used.
- F2 flint glass
- the first output light output from the first correction prism 140 to the first output lens 145 does not change the angle of the light beam even when the wavelength changes, and moves by a small amount in parallel.
- the change in the coupling loss with respect to the parallel movement of the input light beam is small.
- the coupling loss hardly changes by the parallel movement of about 100 ⁇ . Therefore, the first The correction prism 140 can output the diffracted light diffracted by the acousto-optic element 120 to the first output optical fiber 110 with a constant coupling loss independent of the wavelength.
- FIG. 4 is a graph showing an example of the input loss of the first output light by the optical module 100 according to the present embodiment.
- FIG. 4 is a graph showing an example of the input loss of the first output light by the optical module 100 according to the present embodiment.
- FIG. 4 shows the coupling loss of the first output optical fiber 110 with and without the first collection prism 140 when the incident prism 135 is not provided, that is, FIG.
- the result of experimentally measuring the insertion loss for introducing the first output light into the one-output optical fiber 110 is shown.
- the wavelength dependence of the insertion loss in the wavelength range of 150 to 160 nm is reduced from about 2 dB to 0.6 d. It can be seen that it is reduced to about B.
- the input loss shown in FIG. 4 is further reduced by providing the incident prism 135.
- FIG. 5 is a graph showing a comparison result between the insertion loss of the first output light by the optical module 100 according to the present embodiment and the insertion loss by another method.
- the insertion loss A500 indicates the result of experimentally measuring the insertion loss of the first output light in the case where the optical module 100 according to the present embodiment does not include the incident prism 135.
- Insertion loss B 5 1 in a case without the incident prism 1 3 5 ⁇ Pi first ToTadashi prism 1 4 0, by using the acousto-optic device of 0 2 such as propagation velocity of the ultrasonic wave is high T e,
- the insertion loss C520 is calculated by using the incident prism 135 and the first correction pre-filter.
- the insertion loss A500 is smaller than the insertion loss B510 and the input loss C520, and the wavelength dependence of the insertion loss is smaller. It can be further reduced by further providing.
- the emission angle from the acousto-optic device 120 according to the wavelength of the input wave changes according to the change in the frequency of the ultrasonic wave. It is difficult to use it for measurements requiring high wavelength accuracy, such as dispersion measurement.
- the ultrasonic frequency is generated by VCO or the like, sufficient accuracy may not be obtained.
- FIG. 6 is a graph showing a difference in insertion loss between the first output light and the second output light by the optical module 100 according to the present embodiment.
- FIG. 6 shows that the first output light output to the first output optical fiber 110 and the first output light output to the second output optical fiber 115 when the incident prism 135 is not provided. 2 shows the results of experimentally measuring the input loss of output light.
- the average insertion loss 62 0 indicates the average insertion loss of the first output light and the second output light.
- the optical module 100 in the wavelength range of the input light 1520 to 1620 ⁇ , the first output light and the second output light
- the difference in import loss can be kept small.
- the present invention has been described using the embodiment.
- the technical scope of the present invention is not limited to the scope described in the above embodiment.
- Various changes or improvements can be made to the above embodiment. It is apparent from the description of the claims that embodiments with such modifications or improvements can be included in the technical scope of the present invention.
- the optical module 1 0 0, incident prism 1 3 5 and the second correcting prism 1 5 The first correction prism 140 and the second correction prism 140 may be configured without the first correction prism 140 and the second correction prism 150. A configuration that does not include one of 150 may be adopted. Further, the incident prism 135, the first correction prism 140, and the second correction prism 150 may be realized by an optical system that emits incident light at different angles according to the wavelength. Industrial applicability
- an optical module that outputs output light obtained by diffracting input light, it is possible to reduce a change in loss of output light when the wavelength of input light changes. it can.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10394093T DE10394093T5 (de) | 2003-01-31 | 2003-12-26 | Optisches Modul |
GB0515707A GB2412973A (en) | 2003-01-31 | 2003-12-26 | Optical module |
US11/194,042 US20060023291A1 (en) | 2003-01-31 | 2005-07-29 | Optical module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-23008 | 2003-01-31 | ||
JP2003023008A JP2004233710A (ja) | 2003-01-31 | 2003-01-31 | 光モジュール |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/194,042 Continuation US20060023291A1 (en) | 2003-01-31 | 2005-07-29 | Optical module |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004068222A1 true WO2004068222A1 (ja) | 2004-08-12 |
Family
ID=32820706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/016877 WO2004068222A1 (ja) | 2003-01-31 | 2003-12-26 | 光モジュール |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060023291A1 (ja) |
JP (1) | JP2004233710A (ja) |
KR (1) | KR20050095780A (ja) |
CN (1) | CN1759342A (ja) |
DE (1) | DE10394093T5 (ja) |
GB (1) | GB2412973A (ja) |
WO (1) | WO2004068222A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006275917A (ja) * | 2005-03-30 | 2006-10-12 | Olympus Corp | 多光子励起型観察装置および多光子励起型観察用光源装置 |
CN104600555B (zh) * | 2015-01-21 | 2017-10-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | 动态声光调制光频级次选择方法及装置 |
JP6415382B2 (ja) * | 2015-04-30 | 2018-10-31 | 三菱電機株式会社 | 移動体用画像生成装置及びナビゲーション装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61193130A (ja) * | 1985-02-21 | 1986-08-27 | Nippon Kogaku Kk <Nikon> | 光ビ−ム偏向装置 |
JPH03200938A (ja) * | 1989-12-28 | 1991-09-02 | Yokogawa Electric Corp | 超音波光変調装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4773063A (en) * | 1984-11-13 | 1988-09-20 | University Of Delaware | Optical wavelength division multiplexing/demultiplexing system |
US5274487A (en) * | 1989-12-29 | 1993-12-28 | Fujitsu Limited | Photonic switching system |
US6885807B2 (en) * | 2001-03-14 | 2005-04-26 | Nuonics, Inc. | High speed fiber-optic attenuation modules |
-
2003
- 2003-01-31 JP JP2003023008A patent/JP2004233710A/ja active Pending
- 2003-12-26 DE DE10394093T patent/DE10394093T5/de not_active Ceased
- 2003-12-26 KR KR1020057014120A patent/KR20050095780A/ko not_active Application Discontinuation
- 2003-12-26 GB GB0515707A patent/GB2412973A/en not_active Withdrawn
- 2003-12-26 CN CNA2003801102214A patent/CN1759342A/zh active Pending
- 2003-12-26 WO PCT/JP2003/016877 patent/WO2004068222A1/ja active Application Filing
-
2005
- 2005-07-29 US US11/194,042 patent/US20060023291A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61193130A (ja) * | 1985-02-21 | 1986-08-27 | Nippon Kogaku Kk <Nikon> | 光ビ−ム偏向装置 |
JPH03200938A (ja) * | 1989-12-28 | 1991-09-02 | Yokogawa Electric Corp | 超音波光変調装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20050095780A (ko) | 2005-09-30 |
GB0515707D0 (en) | 2005-09-07 |
CN1759342A (zh) | 2006-04-12 |
JP2004233710A (ja) | 2004-08-19 |
DE10394093T5 (de) | 2005-12-22 |
GB2412973A (en) | 2005-10-12 |
US20060023291A1 (en) | 2006-02-02 |
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