GB2105489A - Device for separating radiation beam components which issue from an optical fibre - Google Patents
Device for separating radiation beam components which issue from an optical fibre Download PDFInfo
- Publication number
- GB2105489A GB2105489A GB08225190A GB8225190A GB2105489A GB 2105489 A GB2105489 A GB 2105489A GB 08225190 A GB08225190 A GB 08225190A GB 8225190 A GB8225190 A GB 8225190A GB 2105489 A GB2105489 A GB 2105489A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wavelength
- wavelengths
- beam components
- mirror
- reflection grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 35
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 abstract description 9
- 239000000470 constituent Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 2
Classifications
-
- 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/2931—Diffractive element operating in reflection
-
- 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
-
- 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Laser Beam Processing (AREA)
- Laser Surgery Devices (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
A device for separating radiation beam components of different wavelengths, which issue from an optical fibre by means of a reflection grating (13) and wavelength selective mirror (12) which permits beam components whose wavelengths are comparatively similar to be separated from each other and from those wavelengths substantially different therefrom. A wavelength-selective mirror (12) is arranged between the input optical fibre (10) and the reflection grating (13), which mirror reflects the radiation beams of wavelengths lambda N+1 which are substantially different from the wavelengths lambda 1... lambda N of a group of radiation beams of comparatively similar wavelength to an output fibre (20), via lens (15) and dichroic filter (14) which serves to suppress any radiation of wavelength lambda 1... lambda N also reflected by mirror and transmits the radiation beams of comparatively similar (closely spaced) wavelength to the reflection grating 13 which reflects each wavelength at a different angle ( theta 1... theta N) and effects spatial separation of the constituent wavelengths which are then focused onto output fibres (1, 2...N) via lens (31). <IMAGE>
Description
SPECIFICATION
Device for separating radiation beam components which issue from an optical fibre
The invention relates to a device for separating radiation beam components of different wavelengths which issue from an optical fibre, by means of a reflection grating.
Such a device is known, for example from
Applied Optics, Vol. 18, No. 16, page 2835. In the known device the radiation beam components which issue from the optical fibre, are directed at the reflection grating by means of a lens system.
The angle at which the radiation components are diffracted in the reflection mode as corresponding beams by the grating will depend on the wavelength of the beam component. After having retraversed the lens system, the individual radiation beams become separated and are routed to a corresponding one of a plurality of output optical fibres. Each of the output fibres corresponds to a beam of wavelength A 2, .2....
in respectively, which is diffracted by the grating at an angle t1 2 n respectively.
The known device has the disadvantage that only radiation beams having wavelengths which are comparatively similar to one another, can be separated by a reflection grating in this way.
The invention aims at providing an improved device of the type mentioned in the opening paragraph, which is also suitable for use with one or more radiation beam components whose wavelengths differ substantially from those of the other radiation beam components of comparatively similar wavelength.
According to the invention there is provided a device for separating radiation beam components of different wavelengths which issue from an optical fibre, by means of a reflection grating, characterised in that a wavelength-selective mirror is arranged between the optical fibre and the reflection grating, which mirror reflects at least one radiation beam component whose wavelength differs substantially from the wavelengths of a group of radiation beam components of comparatively similar wavelength onto a corresponding output optical fibre, and transmits the group of radiation beam components of comparatively similar wavelength to the reflection grating.
Further in accordance with the invention there is provided a device for separating radiation beam components of different wavelengths which issue from an optical fibre, by means of a reflection grating, characterised in that a wavelengthselective mirror is arranged between the optical fibre and the reflection grating, which mirror reflects a group of beam components of comparatively similar wavelength onto the reflection grating, and transmits at least one beam component whose wavelength differs substantially from those of the beam components of comparatively similar wavelengths.
According to an embodiment of the invention, a respective reflection grating is arranged in the path of radiation reflected by the separating mirror and in the path of radiation transmitted by the separating mirror.
Embodiments of the invention will now be described by way of example, with reference to the accompanying drawing, of which: Figure 1 shows a first embodiment of a device in accordance with the invention,
Figure 2 shows a second embodiment, and
Figure 3 shows a third embodiment.
In the embodiment shown in Figure 1, a composite beam including components of wavelength #1, #2....#N, N+1, issues from an input optical fibre 1 0. The wavelengths 1' .2....
are comparatively similar to one another but the wavelength AN+1 differs substantially from the other wavelengths. Via a lens 11, the composite beam is made parallel and directed onto a wavelength-selective mirror 12 which transmits the beam components of wavelengths A" .2....
AN substantially unimpeded, and reflects a beam formed by the beam component of wavelength AN+1. This last-mentioned beam is transmitted via a dichroic filter 1 4 and a lens 1 5 to an output fibre 20. The filter 14 suppresses residual radiation of wavelengths A 2, .2.... AN reflected by the mirror 12. The beam components of wavelengths A" bl2, ... are incident on a reflection grating 13 at an angle #1 to the normal 21 after being transmitted by the mirror 12. The component of wavelength A, forms a beam which is diffracted in the reflection mode at an angle 0, to the normal 21, that of wavelength A2 forms a beam at an angle 02, and so on.The beams which are thus spatially separated in accordance with their wavelengths are almost entirely transmitted by the mirror 12 and are focussed by the lens 11 at different locations in the focal plane of the lens 11. At these locations output optical fibres 1, 2,... N are arranged. In this way the respective input beam components of wavelengths A" A2, . . . AN are separated from one another.
In one embodiment the fibres 10 and 20 were identical and had a core diameter of 50 m. The beam components emitted by the fibre 10 had wavelengths of 817 nm, 844 nm and 1325 nm respectively. A beam formed by the component of wavelength 1325 nm entered the fibre 20, that of wavelength A,=817 nm the fibre 1, that of wavelength A2=844 nm the fibre 2. The fibres 1 and 2 had a core diameter of 100 ym. Since the fibres 10 and 20 were identical, it was possible to
reverse the direction of the beam component
having a wavelength of 1325 nm without
additional losses, i.e. to couple a said beam
component issuing from the fibre 20 into the fibre
10.
In the embodiment shown in Figure 2 beam components of wavelengths A 2, .2.... ANI AN+1 issue from an input optical fibre 30. The
wavelengths A, to AN of these beam components
are comparatively similar to one another and the
wavelength AN+1 differs substantially from the
other wavelengths. A lens 31 forms the beam
components into a parallel beam directed onto a wavelength-selective mirror 32 which transmits the beam component of wavelength AN+1 substantially completely (for example 90 to 95%) and reflects the beam components of wavelengths A, and AN almost completely (for example 99.9%). By means of a lens 33 the transmitted beam is focussed in the focal plane of the lens 33, where an output fibre 34 is arranged.
The reflected beam is incident on the reflection grating 35 and the beam components are spatially separated as individual beams after diffraction in the reflection mode from said grating. Subsequently these diffracted beams are reflected by the mirror 32 and are focussed at the input faces of corresponding output optical fibres 1 to N by means of the lens 31. The filter 14 used in the embodiment shown in Figure 1 is now dispensed with.Thus, although the radiation component of wavelength AN+1 of the radiation which has been reflected by the mirror 32 (5 to 10% of the radiation of the wavelength iN+1 incident on the mirror 32) will be reflected by the reflection grating 35, and imaged via the mirror 32 and the lens 31, the diffraction angle will be so great that the image will be situated far beyond the entrance planes of the fibres 1 to N. Thus, even without the filter 14, substantially no crosstalk relating to radiation having a wavelength AN+1 will be introduced into the fibres 1 to N.
In the embodiment shown in Figure 3 two reflection gratings are used. Of the radiation beam components of wavelengths A1 to 1N+M issuing from an input optical fibre 40, the wavelengths AN+1 to AN+M are comparatively similar, as a group, but are situated far from the wavelengths A, to AMN.Via a lens 41 the beam components of wavelengths A1 to AN+M are formed into a parallel beam directed onto wavelength-selective mirror 42, which transmits the beam components of wavelengths i, to AN almost completely (for example 90 to 95%) and which reflects the beam components of wavelengths SIN+1 to AN+M almost completely (for example approximately 99.9%).
The transmitted beam components are diffracted in the reflection mode from a reflection grating 43 to form individual beams which then become spatially separated. After passage through the mirror 42 they are focussed by the lens 41 in the entrance planes of corresponding output optical fibres 1 to N.
The beam components of wavelengths AN+1 to AN+M reflected by the wavelength-selective mirror 42, are diffracted in the reflection mode from a reflection grating 44 to form individual beams which then become spatially separated. Upon reflection from the mirror 42 they are focussed in the entrance planes of output optical fibres N+1 to N+M by means of the lens 41. It will be apparent that, for the same reasons as those applicable to the embodiment shown in Figure 2, the filter 14 of Figure 1 will also not be required in the embodiment shown in Figure 3.
Claims (4)
1. A device for separating radiation beam components of different wavelengths which issue from an optical fibre, by means of a reflection grating, characterised in that a wavelengthselective mirror is arranged between the optical fibre and the reflection grating, which mirror reflects at least one radiation beam component whose wavelength difflers substantially from the wavelengths of a group of radiation beam components of comparatively similar wavelength, onto a corresponding output optical fibre, and transmits the group of radiation beam components of comparatively similar wavelength to the reflection grating.
2. A device for separating radiation beam components of different wavelengths which issue from an optical fibre, by means of a reflection grating, characterised in that a wavelengthselective mirror is arranged between the optical fibre and the reflection grating, which mirror
reflects a group of beam components of comparatively similar wavelength onto the reflection grating, and transmits at least one beam component whose wavelength differs substantially from those of the beam components of comparatively similar wavelengths.
3. A device as claimed in Claim 1 or 2,
characterised in that a respective reflection
grating is arranged in the path of radiation reflected by the separating mirror and in the path
of radiation transmitted by the separating mirror.
4. A device for separating radiation beam
components of different wavelengths which issue from an optical fibre, by means of a reflection
grating, substantially as herein described with
reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8104124A NL8104124A (en) | 1981-09-07 | 1981-09-07 | Device for separating radiation beams emerging from an optical fiber. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2105489A true GB2105489A (en) | 1983-03-23 |
| GB2105489B GB2105489B (en) | 1985-09-04 |
Family
ID=19838024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08225190A Expired GB2105489B (en) | 1981-09-07 | 1982-09-03 | Device for separating radiation beam components which issue from an optical fibre |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5860721A (en) |
| AU (1) | AU552527B2 (en) |
| CA (1) | CA1188552A (en) |
| DE (1) | DE3232493A1 (en) |
| FR (1) | FR2512560B1 (en) |
| GB (1) | GB2105489B (en) |
| IT (1) | IT1152528B (en) |
| NL (1) | NL8104124A (en) |
| SE (1) | SE8205021L (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127575A (en) * | 1982-04-15 | 1984-04-11 | Philips Nv | Optical wavelength-multiplexing and/or demultiplexing device |
| US4671603A (en) * | 1983-11-17 | 1987-06-09 | Pilkington P.E. Limited | Optical filters and multiplexing-demultiplexing devices using the same |
| EP0231874A2 (en) * | 1986-01-30 | 1987-08-12 | Fujitsu Limited | Optical wavelength compounding/dividing device |
| EP0254453A2 (en) * | 1986-07-21 | 1988-01-27 | Polaroid Corporation | Bulk optic grating and device |
| GB2208012A (en) * | 1987-08-05 | 1989-02-15 | Marconi Gec Ltd | Testing semi conductor devices |
| GB2228799A (en) * | 1989-03-02 | 1990-09-05 | British Telecomm | Optical star coupler |
| US5457573A (en) * | 1993-03-10 | 1995-10-10 | Matsushita Electric Industrial Co., Ltd. | Diffraction element and an optical multiplexing/demultiplexing device incorporating the same |
| WO2002101451A1 (en) * | 2001-06-08 | 2002-12-19 | Honeywell International Inc. | Apparatus and method for processing light |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5640802A (en) * | 1979-09-11 | 1981-04-17 | Delta Kogyo Kk | Remote operating device of back mirror |
| JPS5640804A (en) * | 1979-09-13 | 1981-04-17 | Nippon Telegr & Teleph Corp <Ntt> | Optical branching filter |
| DE3037712A1 (en) * | 1980-10-06 | 1982-05-13 | Siemens AG, 1000 Berlin und 8000 München | OPTICAL WAVELENGTH MULTIPLEX SYSTEM |
-
1981
- 1981-09-07 NL NL8104124A patent/NL8104124A/en not_active Application Discontinuation
-
1982
- 1982-09-01 DE DE19823232493 patent/DE3232493A1/en not_active Ceased
- 1982-09-02 CA CA000410671A patent/CA1188552A/en not_active Expired
- 1982-09-03 IT IT23119/82A patent/IT1152528B/en active
- 1982-09-03 SE SE8205021A patent/SE8205021L/en unknown
- 1982-09-03 FR FR8215064A patent/FR2512560B1/en not_active Expired
- 1982-09-03 AU AU87984/82A patent/AU552527B2/en not_active Ceased
- 1982-09-03 GB GB08225190A patent/GB2105489B/en not_active Expired
- 1982-09-07 JP JP57154755A patent/JPS5860721A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127575A (en) * | 1982-04-15 | 1984-04-11 | Philips Nv | Optical wavelength-multiplexing and/or demultiplexing device |
| US4671603A (en) * | 1983-11-17 | 1987-06-09 | Pilkington P.E. Limited | Optical filters and multiplexing-demultiplexing devices using the same |
| EP0231874A2 (en) * | 1986-01-30 | 1987-08-12 | Fujitsu Limited | Optical wavelength compounding/dividing device |
| EP0231874A3 (en) * | 1986-01-30 | 1988-10-05 | Fujitsu Limited | Optical wavelength compounding/dividing device |
| EP0254453A2 (en) * | 1986-07-21 | 1988-01-27 | Polaroid Corporation | Bulk optic grating and device |
| EP0254453A3 (en) * | 1986-07-21 | 1989-03-29 | Polaroid Corporation | Bulk optic echelon and device |
| GB2208012A (en) * | 1987-08-05 | 1989-02-15 | Marconi Gec Ltd | Testing semi conductor devices |
| GB2228799A (en) * | 1989-03-02 | 1990-09-05 | British Telecomm | Optical star coupler |
| US5457573A (en) * | 1993-03-10 | 1995-10-10 | Matsushita Electric Industrial Co., Ltd. | Diffraction element and an optical multiplexing/demultiplexing device incorporating the same |
| WO2002101451A1 (en) * | 2001-06-08 | 2002-12-19 | Honeywell International Inc. | Apparatus and method for processing light |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8205021D0 (en) | 1982-09-03 |
| IT1152528B (en) | 1987-01-07 |
| GB2105489B (en) | 1985-09-04 |
| DE3232493A1 (en) | 1983-03-24 |
| AU552527B2 (en) | 1986-06-05 |
| NL8104124A (en) | 1983-04-05 |
| FR2512560B1 (en) | 1986-08-29 |
| JPS5860721A (en) | 1983-04-11 |
| FR2512560A1 (en) | 1983-03-11 |
| IT8223119A0 (en) | 1982-09-03 |
| CA1188552A (en) | 1985-06-11 |
| SE8205021L (en) | 1983-03-08 |
| AU8798482A (en) | 1983-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930903 |