GB2202102A - Optical transmission system - Google Patents
Optical transmission system Download PDFInfo
- Publication number
- GB2202102A GB2202102A GB8705231A GB8705231A GB2202102A GB 2202102 A GB2202102 A GB 2202102A GB 8705231 A GB8705231 A GB 8705231A GB 8705231 A GB8705231 A GB 8705231A GB 2202102 A GB2202102 A GB 2202102A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data transmission
- transmission system
- reflective
- optical fibre
- preceeding
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 41
- 230000003287 optical effect Effects 0.000 title claims 3
- 239000013307 optical fiber Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000000063 preceeding effect Effects 0.000 claims 12
- 239000000835 fiber Substances 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 abstract 1
- 239000000969 carrier Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/278—Bus-type networks
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optical Communication System (AREA)
Abstract
A Data Transmission System comprising an optical fibre having one or more reflective junctions 4 and one or more transducers 10 operatively associated with the fibre. Data enters the system via the transducers which phase modulates a signal from transmitter 8 travelling along the optical fibre and in combination with the reflective functions, data isolation can be achieved. The capacity of the system may be increased by having a plurality of transducers associated with each reflective junction and utilizing T.D.M. or F.D.M. techniques. <IMAGE>
Description
A Data Transmission Svstem The present invention relates to a data transmission system and in particular to a system capable of discriminating between data transmitted by the system.
A known data transmission system enters information into the system by applying a strain to an optical fibre, via an electromechanical transducer in order to phase modulate a signal travelling through the fibre. The system distinguishes between a plurality of transducers each dependent upon a respective data input, by utilising time or frequency division multiplexing on each data input before data is applied to the transducer. Since the system distinguishes between data inputs by time or frequency division multiplexing, the input terminals and receiver means have to be coordinated with respect to time information or frequency ranges.
Another known data transmission system employs modulated signals transmitted along an optical fibre such that signals entering the system at different locations along the optical fibre are received by the receiver means in a temporally sequential manner.
It is an aim of the present invention to provide a data transmission system capable of transmitting, receiving and distinguishing data from a plurality of data inputs without necessarily utilising time or frequency division multiplexing techniques.
According to the present invention there is provided a data transmission system comprising an optical fibre; a reflective junction located along the length of the optical fibre and spaced from one end thereof to define a section; transmission means for transmitting a signal along said section towards the reflective junction; transducer means in operative association with said section for modulating the signal; and receiver means for detecting the modulated signal.
The system may comprise of one reflective junction which is located at one end of the optical fibre. Alternatively there may be a plurality of reflective junctions whereby adjacent pair or pairs of reflective junctions define one or more sections of the optical fibre.
Preferably the transmission means is located at one end of the optical fibre and the receiver means is also located at one end of the optical fibre and in general both are located at the same end of the optical fibre.
Advantageously the reflective junctions are partially reflective.
The reflective junctions which are located the furthest distance from the transmission means are defined as terminal relective junctions and maybe totally reflective.
In a preferred embodiment, for each section of optical fibre there is a respective transducer means in operative association with it In a second embodiment, for each section there is a plurality of transducer means in operative association with it.
Preferably the transducer means is an electromechanical transducer and maybe coupled to a respective electrical generator.
The present invention will now further be described with reference to the accompanying figures, each of which is a schematic diagram of a data transmitting system in which:
Figure 1 is a system according to the present invention;
Figure 2 is a system according to a preferred embodiment; and
Figure 3 is a system according to a second embodiment.
In figure 1 there is provided an optical fibre 2 with a totally reflective junction 4 located at one end thus defining a section 6 of optical fibre. A transmitter means 8 is also located at one end of the optical fibre 2 but at the opposite end to the reflective junction 4 and so enabling a signal to be transmitted along the section 6 towards the reflective junction 4.
A transducer means 10, preferably an electro-mechanic transducer, is in operative association with the section 6.
Data is introduced into the system by the transducer means 10 which phase modulates the signal transmitted along the optical fibre
2 in dependence upon that data. The transducer means 10 can either phase modulate a single mode or a plurality of modes or modulate
the relative phases of a plurality of modes of the signal transmitted
along the optical fibre 2. A receiver means 12 is located at the same
end of the optical fibre 2 as the transmitter means 8. The
superposition of the transmitted signal and phase modulated signal
reflected back from the reflective junction is detected by the
receiver means 12. The receiver means 12 is then able to distinguish
between the data which has been transmitted by the system.
In a preferred embodiment shown in figure 2, the system
comprises of a plurality of reflective junctions 4 which are all
partially reflective except the terminal reflective junction 4,, which
is totally reflective. Between adjacent pairs of reflective junctions 4
and between the end of the optical fibre 2 and the adjacent reflective
junction 41, are defined the sections 6 of the optical fibre 2.
Each section 6 has operatively associated with it a respective electromechanical transducer 10 and each of which is associated with a data input applied to it, D1 to Dn. The presence of the reflective junctions 4 in the optical fibre 2 result in the signals transmitted along the said optical fibre 2 to arrive at the receiver means 12 in a temporally sequential manner.
Thus in combination, the electromechanical transducers 10 and the reflective junctions 4 enable the receiver means 12 to detect and distinguish data transmitted by system, without necessarily utilising either time or frequency division multiplexing techniques.
However, the second embodiment shorn in figure 3 illustrates how the data transmission capacity of the system can be increased.
Frequency-division or time-division multiplexing techniques can be applied such that for each section 6, there is a plurality of transducers each of which is associated with one data input. For each data input, there is an electrical generator 14 which imparts the data onto higher frequency sub-carriers in the frequency ranges 0
F1, F1 -F2, F2-F3 and F3-F4, therefore isolating data inputs.
Once the frequency range information has been supplied to the receiver means 12, the system is then able to differentiate between date inputs. Alternatively time division multiplexing can be used if timing information is supplied to the respective electrical generators 14 and receiver means 12.
It will be appriciated that modifications maybe made to the system without departing from the scope of the present invention.
Claims (14)
1. A data transmission system comprising an optical fibre; a reflective junction located along the length of the optical fibre and spaced from one end thereof to define a section; transmission means for transmitting a signal along said section towards the reflective junction; transducer means in operative association with said section for modulating the signal; and receiver means for detecting the modulated signal.
2. A data transmission system as claimed in claim 1, wherein there is a single reflective junction.
3. A data transmission system as claimed in claim 1 or claim 2, wherein the reflective junction is located at one of the ends of the optical fibre 4. A data transmission system as claimed in claim 1, wherein there is a plurality of reflective junctions whereby adjacent pair or pairs of reflective junctions define one or more sections of the optical fibre.
5. A data transmission system as claimed in any one of the preceeding claims, wherein the transmission means is located at one end of the optical fibre.
6. A data transmission system as claimed in any one of the preceeding claims , wherein the receiver means is located at one end of the optical fibre.
7. A data transmission system as claimed in any one of the preceeding claims, wherein the reflective juinctions are partially reflective.
8. A data transmission system as claimed in any one of the preceeding claims, wherein the terminal reflective junctions are totally reflective.
9. A data transmitting system as claimed in any one of the preceeding claims, wherein for each section of optical fibre there is a respective transducer means in operative association with it.
10. A data transmission system as claimed in any one of claims 1 to 8, wherein for each section there is a plurality of transducer means in operative association with it.
11. A data transmission sytem as claimed in claim 9 or claim 10, wherein the transducer means is an electromechanical transducer.
12. A data transmission system as claimed in any one of the preceeding claims, wherein each transducer means is coupled to a respective electrical generator.
13. A data transmission system as herein before described with reference to the accompanying drawing.
Amendments to the claims
have been filed as follows
Claims 1. A data transmission system comprising an optical fibre; a reflective junction located along the length of the optical fibre and spaced from one end thereof to define a section; transmission means for transmitting a signal along said section towards the reflective junction; transducer means in operative association with said section for mechanically straining the optical fibre and phase modulating one or more modes of the optical signal and an optically phase sensitive receiver means for detecting the phase modulated modes of the optical signal and for distinguishing the data.
2. A data transmission system as claimed in claim 1, wherein there is a single reflective junction.
3. A data transmission system as claimed in claim 1 or claim 2, wherein the reflective junction is located at one of the ends of the optical fibre
4. A data transmission system as claimed in claim 1, wherein there is a plurality of reflective junctions whereby adjacent pair or pairs of reflective junctions define one or more sections of the optical fibre.
5. A data transmission system as claimed in any one of the preceeding claims, wherein the transmission means is located at one end of the optical fibre.
6. A data transmission system as claimed in any one of the preceeding claims , wherein the receiver means is located at one end of the optical fibre.
7. A data transmission system as claimed in any one of the preceeding claims, wherein the reflective juinctions are partially reflective.
8. A data transmission system as claimed in any one of the preceeding claims, wherein the terminal reflective junctions are totally reflective.
9. A data transmitting system as claimed in any one of the preceeding claims, wherein for each section of optical fibre there is a respective transducer means in operative association with it.
10. A data transmission system as claimed in any one of claims 1 to 8, wherein for each section there is a plurality of transducer means in operative association with it.
11. A data transmission system as claimed in claim 10, wherein the plurality of transducer means utilises time division multiplexing techniques such that there is associated for each transducer means a respective data input.
12. A data transmission sytem as claimed in any one of claims 9 to 11, wherein the transducer means is an electromechanical transducer.
13. A data transmission system as claimed in any one of the preceeding claims, wherein each transducer means is coupled to a respective electrical generator.
14. A data transmission system as herein before described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8705231A GB2202102B (en) | 1987-03-06 | 1987-03-06 | A data transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8705231A GB2202102B (en) | 1987-03-06 | 1987-03-06 | A data transmission system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8705231D0 GB8705231D0 (en) | 1987-04-08 |
| GB2202102A true GB2202102A (en) | 1988-09-14 |
| GB2202102B GB2202102B (en) | 1991-05-22 |
Family
ID=10613412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8705231A Expired GB2202102B (en) | 1987-03-06 | 1987-03-06 | A data transmission system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2202102B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1540907A (en) * | 1976-12-07 | 1979-02-21 | Standard Telephones Cables Ltd | System for obtaining data from a plurality of condition responsive optical devices |
| EP0033237A1 (en) * | 1980-01-24 | 1981-08-05 | Sperry Corporation | Information gathering system multiplexing apparatus |
| GB2106736A (en) * | 1981-09-03 | 1983-04-13 | Standard Telephones Cables Ltd | Optical transmission system |
| US4436365A (en) * | 1981-10-21 | 1984-03-13 | Bell Telephone Laboratories, Incorporated | Data link using integrated optics devices |
| GB2165043A (en) * | 1984-08-09 | 1986-04-03 | Daimler Benz Ag | Fiber optic transmission of the value of a spectrally encoded variable physical quantity |
-
1987
- 1987-03-06 GB GB8705231A patent/GB2202102B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1540907A (en) * | 1976-12-07 | 1979-02-21 | Standard Telephones Cables Ltd | System for obtaining data from a plurality of condition responsive optical devices |
| EP0033237A1 (en) * | 1980-01-24 | 1981-08-05 | Sperry Corporation | Information gathering system multiplexing apparatus |
| GB2106736A (en) * | 1981-09-03 | 1983-04-13 | Standard Telephones Cables Ltd | Optical transmission system |
| US4436365A (en) * | 1981-10-21 | 1984-03-13 | Bell Telephone Laboratories, Incorporated | Data link using integrated optics devices |
| GB2165043A (en) * | 1984-08-09 | 1986-04-03 | Daimler Benz Ag | Fiber optic transmission of the value of a spectrally encoded variable physical quantity |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2202102B (en) | 1991-05-22 |
| GB8705231D0 (en) | 1987-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930306 |