WO2005043207A1 - 光送信装置 - Google Patents
光送信装置 Download PDFInfo
- Publication number
- WO2005043207A1 WO2005043207A1 PCT/JP2004/015786 JP2004015786W WO2005043207A1 WO 2005043207 A1 WO2005043207 A1 WO 2005043207A1 JP 2004015786 W JP2004015786 W JP 2004015786W WO 2005043207 A1 WO2005043207 A1 WO 2005043207A1
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- WIPO (PCT)
- Prior art keywords
- optical
- optical fiber
- laser element
- light
- laser
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
Definitions
- the present invention relates to an optical transmission device that performs video distribution or mobile radio signal transmission using an optical transmission technology.
- frequency-multiplexed subcarriers For long-distance transmission from a base station to an antenna, frequency-multiplexed subcarriers
- An optical fiber transmission technique for superimposing a frequency signal on the light intensity of laser light is used.
- Analog transmission using this frequency multiplexed signal does not require a DZA converter or the like and can easily transmit large amounts of transmitted data, compared to digital signal transmission.However, harmonic distortion due to multiple reflection of light and the like is possible. Degradation of transmission characteristics due to transmission is inevitable.
- a first conventional optical transmission device 10 includes a laser element 11, a lens 12, an optical isolator 13, a lens 14, and an optical fiber 15.
- the lens 12, the optical isolator 13 and the lens 14 are arranged between the laser element 11 and the optical fiber 15.
- the optical isolator 13 suppresses return light to the laser element 11.
- the end face of the optical fiber 15 is coated with a non-reflective coating, and the end face of the optical fiber 15 is polished obliquely.
- the optical axis adjustment of the laser element 11 and the optical fiber 15 An active alignment method is used in which the intensity is monitored and fixed at the maximum.
- Patent Document 1 discloses an example in which a Fabry-Perot laser (FP-LD) is used as the laser element 11. Because FP-LDs are multimode lasers and have greatly deteriorated characteristics due to mode distribution noise, single-mode distributed feedback lasers (DFB-LDs) are often used.
- FP-LD Fabry-Perot laser
- DFB-LDs single-mode distributed feedback lasers
- Patent Document 3 discloses a second conventional optical transmission device.
- the second conventional optical transmission device 20 includes a laser element 21 and an optical fiber 22, and directly couples the laser element 21 and the optical fiber 22 without using a lens.
- the laser element 21 is mounted with high precision on a silicon substrate on which a V-groove has been machined, and a passive alignment method that does not require optical axis adjustment between the optical fiber and 22 is used.
- the end face of the optical fiber 22 is processed obliquely, and the gap between the optical fiber 22 and the laser element 21 is filled with a refractive index matching resin.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-193854
- Patent Document 2 Japanese Patent Application Laid-Open No. 7-38531
- Patent Document 3 JP 2001-21775 A
- the first conventional optical transmission device requires a costly component called an optical isolator in order to suppress reflected return light, which is a factor of deteriorating distortion characteristics. There is.
- an optical isolator and a lens are not required, so that the cost of parts can be reduced.
- the end face of the ferrule, which is the output terminal of the power module light, and the transmission path of the optical fiber are not required, so that the distortion characteristic is easily degraded due to the influence of the returning light.
- the present invention has been made in view of the power of the present invention, and has as its object to provide an optical transmission device in which the influence of reflected return light is small and analog transmission can be performed using only inexpensive components. To do.
- An optical transmitter of the present invention includes a laser element and an optical fiber, and has an optimum position at which an optical coupling efficiency between the laser element and the optical fiber is maximized. And the optical fiber are fixed in an arrangement displaced from the optimal position by a value within a range from 10 m to 150 ⁇ m in the optical axis direction.
- FIG. 1 is a diagram showing a configuration of a first conventional optical transmission device
- FIG. 2 is a diagram showing a configuration of a second conventional optical transmitter.
- FIG. 3 is a perspective view showing an optical transmission device according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram showing a basic configuration of an optical transmission device according to Embodiment 1 of the present invention.
- FIG. 5 is a view for explaining a configuration of an optical transmitting apparatus according to Embodiment 1 of the present invention.
- FIG. 6 is a diagram showing a basic configuration of an optical transmitting apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a diagram showing a basic configuration of an optical transmitting apparatus according to Embodiment 3 of the present invention.
- FIG. 8 shows a basic configuration of an optical transmission system according to Embodiment 4 of the present invention.
- FIG. 9 shows a basic configuration of an optical transmission system according to Embodiment 5 of the present invention. Best mode to implement
- FIG. 3 is a perspective view showing an optical transmission device according to Embodiment 1 of the present invention.
- an optical transmission device 100 according to Embodiment 1 of the present invention includes a laser element (LD) 101 and an optical fiber 102 separated from the laser element 101 by a predetermined distance. You.
- LD laser element
- the laser element 101 is held in a cylindrical camper cage 103.
- Campaign The die 103 is covered and held by a cylindrical component holder 104.
- the optical fiber 102 is held by a cylindrical ferrule 105 made of ceramic.
- the ferrule 105 is covered and held by a cylindrical component holder 106.
- the component holder 104 and the component holder 106 are connected by a sleeve 107.
- a lens 108 is disposed between the laser element 101 and one end surface of the optical fiber 102.
- the lens 108 is held in the camper cage 103.
- the lens 108 converges the laser light emitted from the laser element 101 and makes it incident on one end face of the optical fiber 102.
- the optical transmitter 100 has an optimum position at which the optical coupling efficiency between the laser element 101 and the optical fiber 102 is maximized.
- the laser element 101 and the optical fiber 102 are fixed so as to be displaced from the optimum position in the optical axis direction by a value within a range from 10 ⁇ m to 150 ⁇ m.
- the lens 108 is formed of a ball lens.
- Ball lenses have lower optical coupling efficiency than aspheric lenses, but are less expensive.
- the optical coupling efficiency between the ball lens and the optical fiber 102 is about 10-20%, while the optical coupling efficiency between the aspheric lens and the optical fiber 102 is about 30-50%.
- Embodiment 1 of the present invention as shown in FIG. 4, the laser element 101 and the optical fiber 102 are separated from the optimum position where the optical coupling efficiency is maximized in the optical axis direction (Z-axis direction). It is fixed at a position shifted by the range.
- the end face of the optical fiber 102 is made to face the laser element 101 with the optical fiber 102 after the ordinary adjustment step of searching for the optimum position where the optical coupling efficiency is maximum.
- This can be realized by adding a process of fixing the optical fiber in the direction of the optical axis (Z-axis direction) with an arrangement shifted by a value within the range of 10 ⁇ m to 150 ⁇ m.
- the end face of the optical fiber 102 is laid in the X-axis or Y-axis direction perpendicular to the optical axis of the optical fiber 102. Although it is possible to deviate from the optical element 101, it is difficult to adjust the optical coupling efficiency because the optical coupling efficiency drops sharply with respect to the XY-axis displacement. It is desirable to shift the end face of 102 with respect to the laser element 101.
- the optical coupling efficiency between the laser element 101 and the optical fiber is reduced to 10% or less.
- a shift of 10 m or more which may unexpectedly shift the position of the optical fiber, cannot normally occur.
- the deviation amount of the optical fiber before and after YAG laser welding is usually several / zm or less. Therefore, the decrease in the optical coupling efficiency in the first embodiment of the present invention can only be achieved intentionally.
- the laser element 101 and the optical fiber 102 are fixed in an arrangement displaced from the optimum position in the optical axis direction by a value within a range from 10 m to 150 ⁇ m. I do.
- the displacement amount of the optical fiber before and after YAG laser welding for fixing the conventional optical fiber is several / zm or less, and the reduction of the optical coupling efficiency occurs only by several%. Therefore, it is necessary to intentionally reduce the optical coupling efficiency, and a shift of at least 10 m is required. On the other hand, if the deviation of the optical fiber is too large, the signal-to-noise ratio (CNR) deteriorates, and there is an upper limit to the allowable deviation.
- CNR signal-to-noise ratio
- FIG. 5 is a diagram for explaining an example of a calculation result of a signal-to-noise ratio (CNR) with respect to a shift amount of the optical fiber 102 in the optical axis direction.
- a curve A in FIG. 5 shows an example of a calculation result of a signal-to-noise ratio (CNR) with respect to a shift amount of the optical fiber 102 in the optical axis direction.
- Curve B in FIG. 5 shows the specification value.
- the cause of the reflected return light from the optical fiber 102 is considered to be the reflected return light of the light receiving element and the reflection of the optical connector.
- the reflected return light of the light receiving element can be easily improved by shifting the angle of the light receiving element surface with respect to the incident light by 90 degrees.
- an angled physical contact (APC) connector in which the end face of the optical fiber 102 is obliquely polished is often used, so that the reflected return light of 60 dB or less can be realized.
- angled physical contact (APC) connectors are expensive.
- a super PC (SPC) connector which is often used in digital transmission systems, can provide reflected return light of 40dB or less, but if the connector is not sufficiently cleaned, or if the end face of the connector is damaged. In that case the possibility of 25dB-30dB is inevitable.
- the laser element 101 and the optical fiber 102 are displaced from the optimum position by a value within a range from 10 m to 150 ⁇ m in the optical axis direction. Since it is fixed at, the effect of reflected return light is small, and analog transmission can be performed using only inexpensive components. Further, in the first embodiment of the present invention, since the laser element and the optical fiber may be arranged within a predetermined range, manufacturing is easy.
- FIG. 6 is a diagram showing a basic configuration of an optical transmission device according to Embodiment 2 of the present invention.
- the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.
- the optical transmitting apparatus 400 according to Embodiment 2 of the present invention is configured such that the laser element 101 and the optical fiber 102 move from the optimal position in the optical axis direction from 10 ⁇ m to 150 ⁇ m.
- the laser beam is emitted from the laser element 101 in parallel with the optical axis of the outgoing light from the end face of the optical fiber 102, and the emitted light from the laser element 101 is This is so as not to be parallel to the optical axis of the light reflected by the end face of the fiber 102.
- the end face of the optical fiber 102 is obliquely moved as usual, and the output optical axis of the laser element 101 and the reflected optical axis at the end face of the optical fiber 102 are not parallel but angled. This prevents the reflected light of the laser light from returning at the end face of the optical fiber 102. Further, in the manufacturing process of the optical transmission device 400, an angle is set so that the output light axis of the optical fiber 102 is not parallel to the output light of the laser element 101 so that the output light of the optical fiber 102 does not return to the laser element 101.
- the light intensity coupled to the optical fiber 102 is maximized. And fixing the optical fiber 102 by welding with a YAG laser.
- the method of tilting the optical axis of the optical fiber 102 so that the output optical axis is not parallel to the output light of the laser element 101 is used.
- the end face of the optical fiber 102 is polished into a slope so as to have an angle of several degrees with respect to the optical axis, so that the output light of the optical fiber 102 is inclined with respect to the optical axis of the optical fiber 102. It is to be.
- the second one is to adjust the angle by rotating the optical fiber 102 with respect to the optical axis of the optical fiber 102.
- a component (sleeve) holding the optical fiber 102 is arranged in advance so that the optical axis of the optical fiber 102 is inclined.
- the light emitted from the laser element 101 is emitted from the end face of the optical fiber 102 to the outside.
- X, ⁇ , ⁇ as in the first embodiment of the present invention. This eliminates the need for the step of shifting the axis to the above-described optimum value, and makes it easy to adjust the positions of the laser element 101 and the optical fiber 102.
- FIG. 7 is a diagram showing a basic configuration of an optical transmission device according to Embodiment 3 of the present invention.
- the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.
- An optical transmitting device 500 according to Embodiment 3 of the present invention shown in FIG. 7 includes an optical transmitting device 100 and a multi-branch optical power blur 501, and a laser element 101 of the optical transmitting device 100 has a multimode oscillation laser.
- the optical fiber 102 is a 1.3 m zero-dispersion type optical fiber, a multi-branch optical power source 501 is connected downstream of the laser element 101, and the laser element 101 and the optical fiber 102 are connected to each other.
- the product of the optical coupling efficiency and the square of the reciprocal of the number of branches of the multi-branch optical power bracket 501 is 10% or less.
- Optical transmission apparatus 500 is an optical transmission apparatus for a downstream analog signal.
- a multi-branch optical power plug 501 is connected to one laser element 101 for downlink.
- an optical isolator is used to avoid deterioration due to reflected light and return light using a high-output multi-mode oscillation laser device (FP-LD) or single-mode oscillation laser device (DFB-LD). was required.
- FP-LD high-output multi-mode oscillation laser device
- DFB-LD single-mode oscillation laser device
- the laser light is embedded in a can package with a lens.
- the multi-branch optical power bra 501 is connected by fusion.
- the reflected return light generated on the transmission path side from the multi-branch optical power bra 501 attenuates when passing through the multi-branch optical power bra 501.
- the reflected return light is attenuated by the square of 1ZN, so that the optical coupling efficiency of the multimode oscillation laser device (FP-LD) is It is possible to increase the square of N compared to the first embodiment of the present invention. it can.
- an aspheric lens may be used.
- the third embodiment of the present invention may include an optical transmitter 400 instead of the optical transmitter 100.
- Embodiment 3 of the present invention in addition to the effects of Embodiment 1 and Embodiment 2 of the present invention, even if reflected return light occurs, The effect of light can be reduced.
- FIG. 8 is a block diagram showing a basic configuration of an optical transmission system according to Embodiment 4 of the present invention.
- the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.
- An optical transmission system 600 according to Embodiment 4 of the present invention shown in FIG. 8 includes a master station 610 and a plurality of slave stations 620 (only one slave station is shown! /). Te ru.
- the master station 610 includes an optical transmitter 611, an optical isolator 612, a multi-branch optical power 613, a wavelength selection filter 614, a light receiving element (PD) 615, and a frequency separation filter 616.
- the optical transmitter 611 is connected to the optical isolator 612 by the optical fiber 102.
- the optical isolator 612 is connected to the multi-branch optical brass 613 and the optical fiber 102.
- the wavelength selection filter 614 is connected to the multi-branch optical power plug 613 and the light receiving element 615 via the optical fiber 102.
- the optical transmitting device 611 has the same configuration as the optical transmitting device 100 or the optical transmitting device 400.
- the laser element 101 of the optical transmission device 611 is a single mode oscillation laser element that oscillates in a 1.5 m wavelength band.
- the optical fiber 102 is a 1.3 / zm zero dispersion type optical fiber. Perhaps each of the plurality of slave stations 620 is connected to the plurality of output ends of the branching light bra 613 by a single-core optical fiber 102.
- the slave station 620 includes a wavelength selection filter 621, an optical transmission device 622, a light receiving element 623, and a frequency separation filter 624.
- the optical transmitting device 622 has the same configuration as the optical transmitting device 100 or the optical transmitting device 400.
- the laser element 101 of the optical transmission device 622 is 1.
- the wavelength selection filter 621 is a multimode oscillation laser device that oscillates in a wavelength band.
- the wavelength selection filter 621 The communication device 622 and the light receiving element 623 are connected to the optical fiber 102.
- the wavelength selection filter 621 is connected to the wavelength selection filter 614 of the master station 610 by the optical fiber 102.
- the wavelength selection filter 621 is an inexpensive fusion type filter having an isolation of 10 dB or less.
- the optical fiber 102 is a 1.3 m zero dispersion optical fiber.
- An optical transmission system 600 according to Embodiment 4 of the present invention shown in FIG. 8 is a single-core bidirectional optical transmission system for analog transmission.
- the optical transmission system 600 is an analog RF signal transmission system in which a plurality of slave stations 620 are connected to one master station 610 such as a mobile base station antenna system.
- the downlink signal and the uplink signal are subcarrier signals each having a carrier frequency between certain frequency widths, and the uplink and downlink signal frequency bands do not overlap.
- the downstream optical transmission device 611 emits a downstream laser beam having a wavelength of 1.5 m and supplies the laser beam to the multi-branch optical power bracket 613 via the optical isolator 612.
- the multi-branch optical power bracket 613 branches the downstream laser light from the optical transmission device 611 to generate a plurality of downstream branched laser lights, and outputs the plurality of downstream branched laser lights to the plurality of Give to bureau 620.
- the wavelength selection filter 621 receives the down-branch laser light from the multi-branch optical power plug 613 as the down-reception laser light, and the down-reception laser light having a wavelength of 1. Is selected and separated and given to the light receiving element 623.
- the light receiving element 623 photoelectrically converts the downstream reception laser light to generate a downstream reception signal and provides the downstream reception signal to the frequency separation filter 624.
- the frequency separation filter 624 separates only the carrier frequency of the down signal from the down reception signal received from the light receiving element 623.
- the optical transmitter 622 emits an upstream laser beam having a wavelength of 1.3 m and transmits the upstream laser beam via the optical fiber 102, the wavelength selection filter 621 and the optical fiber 102 to the master station 610. Give to.
- wavelength selection filter 614 receives the upstream laser light from wavelength selection filter 621 as upstream reception laser light, and receives the upstream reception laser light having a wavelength of 1. from the upstream reception laser light. Are selected and separated, and given to the light receiving element 615.
- the light receiving element 615 generates an upstream reception signal by photoelectrically converting the upstream reception laser beam and supplies the generated upstream reception signal to the frequency filter 616.
- the frequency separation filter 616 separates only the carrier frequency of the upstream signal from the upstream reception signal received from the light receiving element 615.
- a two-way optical transmission system of a core optical fiber can be provided.
- FIG. 9 is a block diagram showing a basic configuration of an optical transmission system according to Embodiment 5 of the present invention.
- the same components as those in the fourth embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.
- An optical transmission system 700 according to Embodiment 5 of the present invention shown in FIG. 9 includes a master station 710 and a plurality of slave stations 720 (only one slave station is shown! /). Te ru.
- the optical transmission system 700 according to Embodiment 5 of the present invention has an optical transmitter 711 instead of the optical transmitter 611 in Embodiment 4 of the present invention, and the optical isolator 612 is omitted.
- the IX2 optical branching couplers 712 and 721 are used in place of the wavelength selecting finolators 614 and 621.
- the master station 710 includes an optical transmitter 711, a multi-branch optical power 613, an IX2 optical branch 712, a light receiving element (PD) 615, and a frequency separation filter 616.
- the optical transmission device 711 has the same configuration as the optical transmission device 100 or the optical transmission device 400.
- the laser element 101 of the transmitting device 711 is connected to the multi-branch optical power plug 613 and the optical fiber 102.
- the IX2 optical branching power bra 712 is connected to the multi-branching optical brassier 613 and the light receiving element 615 by an optical fiber 102.
- the laser element 101 of the optical transmitter 711 is a multi-mode oscillation laser element that oscillates in a wavelength band.
- the optical fiber 102 is a 1.3 / zm zero dispersion type optical fiber.
- the plurality of output ends of the multi-branch optical power brabler 613 are connected to the plurality of slave stations 720 via the optical fibers 102 of the respective cores.
- the slave station 720 includes a 1 ⁇ 2 optical branching power bracket 721, an optical transmitter 622, a light receiving element 623, and a frequency separation filter 624.
- the laser element 101 of the optical transmitter 622 is a multimode oscillation laser element that oscillates in a 1.3 m wavelength band.
- IX 2 optical branching power bra 721 The communication device 622 and the light receiving element 623 are connected to the optical fiber 102. Further, the 1 ⁇ 2 optical branch coupler 721 is connected to the 1 ⁇ 2 optical branch coupler 712 of the master station 610 by the optical fiber 102.
- the downlink signal and the uplink signal are subcarrier signals each having a carrier frequency between certain frequency widths, and the uplink and downlink signal frequency bands do not overlap.
- the downstream optical transmission device 711 radiates a downstream laser beam having a wavelength of 1.3 m and gives it to the multi-branch optical power bra 613.
- the multi-branch optical power bracket 613 branches the downstream laser light from the optical transmission device 711 to generate a plurality of downstream branch laser lights and outputs the plurality of downstream branch laser lights via the optical fiber 102, the 1 ⁇ 2 optical branch coupler 712, and the optical fiber 102.
- the IX2 optical branching coupler 721 receives the downstream branching laser light from the multi-branch optical power plug 613 as the downstream receiving laser light, and the wavelength from the downstream receiving laser light is 1.
- the light receiving element 623 photoelectrically converts the downstream reception laser light to generate a downstream reception signal and supplies the downstream reception signal to the frequency separation filter 624.
- the frequency separation filter 624 separates only the carrier frequency of the down signal from the down reception signal received from the light receiving element 623.
- the optical transmission device 622 emits an upstream laser beam having a wavelength of 1.3 m and outputs the upstream laser beam via the optical fiber 102, the 1 ⁇ 2 optical branching coupler 721, and the optical fiber 102. Give to master station 710.
- the IX 2 optical branching coupler 712 receives the upstream laser light from the IX 2 optical branching coupler 721 as upstream receiving laser light, and the upstream receiving laser having a wavelength of 1. from the upstream receiving laser light.
- the light is selectively separated and given to the light receiving element 615.
- the light receiving element 615 photoelectrically converts the upstream received laser beam, generates an upstream received signal, and supplies the generated upstream received signal to the frequency separation filter 616.
- the frequency separation filter 616 separates only the carrier frequency of the upstream signal from the upstream reception signal received from the light receiving element 615.
- an optical transmitter including a laser element and an optical fiber, the optical transmitting apparatus having an optimum position at which the optical coupling efficiency between the laser element and the optical fiber is maximized.
- a configuration is adopted in which the element and the optical fiber are fixed at positions displaced from the optimum position in the optical axis direction by a value within a range from 10 m to 150 ⁇ m.
- the laser element and the optical fiber are fixed in an arrangement displaced from the optimal position in the optical axis direction by a value within a range from 10 ⁇ m to 150 m, so that the influence of the reflected return light is affected.
- analog transmission is possible with only small and inexpensive parts.
- the laser element and the optical fiber may be arranged within a predetermined range, so that the manufacturing is easy.
- light emitted from the laser element is parallel to an optical axis of light emitted out of the end face force of the optical fiber, and The light emitted from the laser element is not parallel to the optical axis of the light reflected by the end face of the optical fiber.
- the laser element is a multimode oscillation laser element
- the optical fiber is a 1.3 m zero-dispersion optical fiber. That is, the optical coupling efficiency between the multimode oscillation laser element and the optical fiber is 10% or less.
- the laser element is a multimode oscillation laser element
- the optical fiber is a 1.3 m zero-dispersion fiber.
- a multi-branch optical power bra is connected to the subsequent stage of the multi-mode oscillation laser element, and the light coupling efficiency between the multi-mode oscillation laser element and the optical fiber and the square of the reciprocal of the number of branches of the multi-branch optical power bra. Use a configuration where the product is 10% or less.
- the present invention can be applied to an optical transmission device and an optical transmission system that perform video distribution or mobile radio signal transmission using optical transmission technology.
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/575,460 US20070064761A1 (en) | 2003-10-30 | 2004-10-25 | Optical transmission apparatus |
EP04817415A EP1679533A1 (en) | 2003-10-30 | 2004-10-25 | Optical transmission device |
Applications Claiming Priority (2)
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JP2003370365A JP2005136158A (ja) | 2003-10-30 | 2003-10-30 | 光送信装置 |
JP2003-370365 | 2003-10-30 |
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US (1) | US20070064761A1 (ja) |
EP (1) | EP1679533A1 (ja) |
JP (1) | JP2005136158A (ja) |
KR (1) | KR20060066129A (ja) |
CN (1) | CN1867849A (ja) |
WO (1) | WO2005043207A1 (ja) |
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DE10128827A1 (de) * | 2001-06-15 | 2003-01-09 | Aifotec Ag Fiberoptics | Justierverfahren, insbesondere Laser-Justierverfahren und hierfür geeigneter Aktor |
KR100731859B1 (ko) | 2005-05-31 | 2007-06-25 | 엘에스전선 주식회사 | 외부 광귀환 잡음특성의 향상구조를 갖는 레이저 다이오드 |
JP5022015B2 (ja) * | 2006-12-14 | 2012-09-12 | 日本オプネクスト株式会社 | 半導体レーザ素子及びそれを用いた光モジュール |
JP5356560B2 (ja) | 2011-06-02 | 2013-12-04 | 古河電気工業株式会社 | レーザ装置および調整方法 |
JP5605382B2 (ja) * | 2012-02-20 | 2014-10-15 | 住友電気工業株式会社 | 光モジュール |
US10180545B2 (en) * | 2016-03-17 | 2019-01-15 | Applied Optoelectronics, Inc. | Alignment correction for optical isolator in a coaxial transmitter optical subassembly (TOSA) |
JP2017183474A (ja) * | 2016-03-30 | 2017-10-05 | 技術研究組合光電子融合基盤技術研究所 | 光送信器 |
JP7172182B2 (ja) * | 2018-06-28 | 2022-11-16 | 富士フイルムビジネスイノベーション株式会社 | 発光装置、光信号送信装置及び光伝送システム |
JP2022001919A (ja) * | 2020-06-22 | 2022-01-06 | 三和電気工業株式会社 | 光モジュール及びその製造方法 |
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JPH05343709A (ja) * | 1992-06-08 | 1993-12-24 | Sumitomo Electric Ind Ltd | ピッグテール型光モジュールの製造方法 |
JPH0738531A (ja) * | 1991-12-26 | 1995-02-07 | Nakagawa Applied Res:Kk | 波長多重アナログ光通信装置 |
JPH09318851A (ja) * | 1996-05-30 | 1997-12-12 | Matsushita Electric Ind Co Ltd | 光結合モジュール及びその製造方法並びにサブキャリア多重通信システム |
JPH10170772A (ja) * | 1996-12-13 | 1998-06-26 | Kyocera Corp | 光モジュール及びその製造方法 |
JP2000193854A (ja) * | 1998-12-25 | 2000-07-14 | Toshiba Corp | 光アナログ伝送装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001021775A (ja) * | 1999-07-09 | 2001-01-26 | Sumitomo Electric Ind Ltd | 光学装置 |
-
2003
- 2003-10-30 JP JP2003370365A patent/JP2005136158A/ja active Pending
-
2004
- 2004-10-25 US US10/575,460 patent/US20070064761A1/en not_active Abandoned
- 2004-10-25 CN CNA2004800304088A patent/CN1867849A/zh active Pending
- 2004-10-25 EP EP04817415A patent/EP1679533A1/en not_active Withdrawn
- 2004-10-25 KR KR1020067008306A patent/KR20060066129A/ko not_active Application Discontinuation
- 2004-10-25 WO PCT/JP2004/015786 patent/WO2005043207A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0738531A (ja) * | 1991-12-26 | 1995-02-07 | Nakagawa Applied Res:Kk | 波長多重アナログ光通信装置 |
JPH05343709A (ja) * | 1992-06-08 | 1993-12-24 | Sumitomo Electric Ind Ltd | ピッグテール型光モジュールの製造方法 |
JPH09318851A (ja) * | 1996-05-30 | 1997-12-12 | Matsushita Electric Ind Co Ltd | 光結合モジュール及びその製造方法並びにサブキャリア多重通信システム |
JPH10170772A (ja) * | 1996-12-13 | 1998-06-26 | Kyocera Corp | 光モジュール及びその製造方法 |
JP2000193854A (ja) * | 1998-12-25 | 2000-07-14 | Toshiba Corp | 光アナログ伝送装置 |
Also Published As
Publication number | Publication date |
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EP1679533A1 (en) | 2006-07-12 |
JP2005136158A (ja) | 2005-05-26 |
US20070064761A1 (en) | 2007-03-22 |
KR20060066129A (ko) | 2006-06-15 |
CN1867849A (zh) | 2006-11-22 |
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