GB2500717A - Optical sensing system with amplification - Google Patents
Optical sensing system with amplification Download PDFInfo
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- GB2500717A GB2500717A GB1205785.7A GB201205785A GB2500717A GB 2500717 A GB2500717 A GB 2500717A GB 201205785 A GB201205785 A GB 201205785A GB 2500717 A GB2500717 A GB 2500717A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 52
- 230000003321 amplification Effects 0.000 title claims abstract description 14
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 75
- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 230000001902 propagating effect Effects 0.000 claims description 4
- 102100032450 Endothelial differentiation-related factor 1 Human genes 0.000 description 8
- 101001016384 Homo sapiens Endothelial differentiation-related factor 1 Proteins 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 229910052691 Erbium Inorganic materials 0.000 description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- CHBOSHOWERDCMH-UHFFFAOYSA-N 1-chloro-2,2-bis(4-chlorophenyl)ethane Chemical compound C=1C=C(Cl)C=CC=1C(CCl)C1=CC=C(Cl)C=C1 CHBOSHOWERDCMH-UHFFFAOYSA-N 0.000 description 2
- 101100352626 Arabidopsis thaliana QUA2 gene Proteins 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000022673 Distal myopathy, Welander type Diseases 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- 238000007493 shaping process Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
- G01D5/32—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 with attenuation or whole or partial obturation of beams of light
- G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35383—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/22—Transmitting seismic signals to recording or processing apparatus
- G01V1/226—Optoseismic systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/30—Arrangements in telecontrol or telemetry systems using a wired architecture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/70—Arrangements in the main station, i.e. central controller
- H04Q2209/75—Arrangements in the main station, i.e. central controller by polling or interrogating the sub-stations
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Acoustics & Sound (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Lasers (AREA)
Abstract
An optical sensing system comprising a plurality of optical sensor units OSU and a plurality of discrete optical amplifiers utilising remote pumping. Pump power propagates to the discrete amplifiers sequentially. The system comprises a transmission optical fibre 104 and a return optical fibre 105 comprising discrete lengths of doped fibre EDF for providing amplification to signals. The optical sensor units are optically coupled to the transmission fibre with wavelength selective couplers, and to the return fibre with wavelength selective couplers not within the discrete lengths of doped fibre. A source of light 107 is optically coupled to the return fibre, for pumping more than one of the lengths of doped fibre. The system may be an undersea seismic sensing system. The discrete lengths of doped fibre may be selected to provide a gain which compensates for losses in the system.
Description
OPTICAL SENSING SYSTEM WITH AMPLIFICATION
Technical Field
The present invention relates to optical sensing systems. It is particularly related to, but in no way limited to sub-sea seismic sensing systems.
Background
Optical sensors provide a convenient method of monitoring a range of physical properties of a location. The relative simplicity and robustness of optical sensors and the ability to locate sensors significant distances from complex interrogation hardware make optical systems particularly attractive where the sensor is to be located in hostile environments.
A particular family of optical sensing systems utilises a light source and detector (interrogator) located at a convenient interrogator location some distance from the actual sensors, with a fibre optic connection between. A particular application of such sensing systems is the marine oil and gas industry for seismic sensing, where the sensors are located on the sea floor and the interrogation location is on a surface platform or vessel.
Due in part to the distance of the interrogator system from the sensors optical signals experience significant attenuation propagating from the source to the sensors and back to the detector. Other parts of the system also attenuate the optical signals. The attenuation must be managed to ensure signals arrive at the detector with sufficient power and Optical Signal to Noise Ratio (OSNR) to enable a reliable analysis. The attenuation may limit the size of sensor systems that can be interrogated from each interrogator location.
The embodiments described below are not limited to implementations which solve any or all of the disadvantages of known optical sensing systems.
Summary
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
There is provided an optical sensing system, comprising a transmission optical fibre, a return optical fibre comprising discrete lengths of doped fibre for providing amplification to signals propagating in the return optical fibre, a plurality of optical sensor units optically coupled to the transmission optical fibre with wavelength selective couplers at distinct positions along that fibre and to the return optical fibre with wavelength selective couplers at distinct positions not within the discrete lengths of doped fibre, and a source of light optically coupled to the return optical fibre, the light output from the source being for pumping more than one of the lengths of doped fibre.
A selection of optional features is set out in the dependent claims.
The preferred features may be combined as appropriate, as would be apparent to a skilled person, and may be combined with any of the aspects of the invention.
Brief Description of the Drawings
Embodiments of the invention will be described, by way of example, with reference to the following drawings, in which: Figure 1 is a schematic diagram of an optical sensing system; Figure 2 shows a table of exemplary parameters; Figure 3 shows a chart of Giles parameters for an exemplary doped fibre; Figure 4 shows a chart of pump power along a return optical fibre; Figure 5 shows a chart of signal power against channel number at a receiver; Figure 6 shows a chart of OSNR against channel number at a receiver; Figure 7 shows an optical spectrum at a receiver; and Figure 8 shows a flow chart of an exemplary method for selecting doped fibre lengths.
Common reference numerals are used throughout the figures to indicate similar features.
Detailed Description
Embodiments of the present invention are described below by way of example only. These examples represent the best ways of putting the invention into practice that are currently known to the Applicant although they are not the only ways in which this could be achieved.
The description sets forth the functions of the example and the sequence of steps for constructing and operating the example. However, the same or equivalent functions and sequences may be accomplished by different examples.
Figure lisa schematic diagram of an optical sensing system which includes optical amplification to mitigate optical losses in the system. The inclusion of amplification may allow the system to be deployed over a greater area.
An interrogation system 100 is located atan interrogation location, for example aboard a vessel on the sea surface. The interrogation system comprises a transmitter 101 and receiver 102 for transmitting light to a sensor array 103. The transmitter 101 comprises a source of a plurality of signals at discrete wavelengths to utilise Wavelength Division Multiplexing (WDM) to increase the number of sensors interrogated by an interrogation system. The optical signals (sensing signals) output from the transmitter are utilised to interrogate optical sensors. The transmitter is optically coupled to a transmission riser fibre 104 which is coupled to the sensor array 103. Transmission riser fibre 104 may extend over substantial distances, for example connecting an interrogator on a surface vessel to a sensor array on the sea bed.
Transmission riser fibre 104 is connected to a series of Optical Drop Multiplexers (ODM5), ODM1, ODM2 ODM1 5 each of which drops at least one wavelength from the multiplexed signals propagating in transmission riser fibre 104. The drop pod of each 0DM is coupled to an Optical Sensor Unit (OSU) OSU1, OSU2 05U16 which is interrogated by the wavelengths dropped by the respective 0DM. The output of each OSU is optically coupled to an add port of an Optical Add Multiplexer (OAM), OAM1, OAM2 OAM15, which couples the respective wavelength onto a return riser fibre 105, while allowing other wavelengths to propagate. The OAM5 are connected in series along the return riser fibre 105 ultimately to the receiver 102 of the interrogator 100. An optical isolator 109 is provided at the input to the receiver to isolate the sensing system from reflections from the receiver. There is one more OSU than 0DM and OAM since the final ODM/OAM effectively splits two remaining signals between OSUs 15 and 16. The pass output 0DM 15 therefore only comprises the wavelengths for OSU 16 and thus a further ODM/OAM is not required for OSU1 6.
As can be seen in Figure 1, schematically, the system forms a ladder' of sensors with the OSUs forming rungs of the ladder. The system may, however, be laid out in any required physical layout to place the OSUs at the required sensing locations.
The OAMs and ODMs may be mirrors of each other having the same characteristics. For certain optical multiplexing technologies, corresponding DAMs and DDMs may be provided by devices of the same design.
The OSUs may comprise one or more optical sensors. For example Time Division Multiplexing (TDM) may be utilised to interrogate a plurality of optical sensors in an OSU with a single wavelength.
Each 0DM/DAM may couple one or more wavelengths to each DSU. Typically, each wavelength transmitted by the interrogator is only directed to a single DSU to avoid splitting the power of a wavelength between more than one OSU.
Discrete lengths of doped fibre EDF1, EDF2 EDF15 are provided along the return riser fibre 105. In the system of Figure 1 a length of doped fibre is provided immediately after each OAM (in terms of sensing signal propagation). The doped fibre provides optical amplification to optical signals returning to the interrogator 100 from the sensors when it is pumped with an appropriate optical signal at a pump wavelength. For example the doped fibre may be Erbium doped fibre, which is commonly pumped with an optical signal of either 1480nm or 980nm wavelength to provide gain to optical signals in the l5SOnm transmission window (approximately 1530nm -l6lOnm). In the example a length of doped fibre is not provided specifically for OSU16. This is because the signal(s) interrogating that DSU do not incur any significant additional loss above that incurred for the signal(s) interrogating OSU15. In alternative embodiments an additional length of EDF may be provided for the final DSU.
A source of pump light 107 is provided and coupled onto the return riser fibre by WDM coupler 108 such that it propagates along that fibre in the opposite direction to the sensor signals. Where the doped fibre is Erbium doped fibre the pump light will typically be at a wavelength of approximately 1480nm since typical optical fibre has a lower loss at l4BOnm than 980nm. Different pump wavelengths may be utilised depending on the doped fibre utilised in the system. Other sources of pump light may be utilised as will be appreciated by the reader.
The pump light propagates along the return riser fibre in the opposite direction to the sensing signals returning from the sensors, that is, it is a counter-propagating pump signal. A portion of the pump light is absorbed by each length of doped fibre. This absorption leads to amplification of signals returning from the sensors according to the conventional principles of doped fibre amplification. Pump light not absorbed by each length of doped fibre propagates to the subsequent lengths of fibre. Each length of fibre accordingly forms a remotely pumped doped fibre amplifier. The DAMs along the return riser fibre are designed to pass the pump light with minimum loss.
In an alternative configuration additional wavelength multiplexers may be provided either side of some or all of the DAMs to bypass the pump light around the DAM. This configuration allows the design of the sensor WDMs to be optimised for the sensing signals, without having to compromise the design to allow the passage of the pump light.
The lengths of doped fibre provide amplification for a varying number of wavelengths. In the example of Figure 1 the most distal length of fibre EDF15 amplifies only the wavelength(s) that probe(s) the most distal two sensor units. The most proximal length fibre EDF1 amplifies all of the wavelengths.
The length of each doped fibre may be selected to provide the optimum overall system performance. The lengths will depend on a set of parameters including, but not limited to, sensing wavelengths and power, number of sensors, wavelength distribution amongst sensors, losses throughout the system, and the characteristics of the doped fibre utilised.
In general it is anticipated that each length of doped fibre will provide a level of amplification that approximately compensates for the additional loss each wavelength incurs compared to the loss experienced by the wavelength with the minimum system loss. In an example system the compensated loss may be the pass loss of each DAM and DDM that a wavelength passes through.
Since the pump light is at a substantially different wavelength to the sensing signals scattered pump light does not affect the DSNR of the returning sensing signals.
Figure 2 shows a table of exemplary dab for the system shown in Figure 1. Each DSU is interrogated by a single wavelength and has a loss of 29dB. The wavelength of each channel is as defined by the ITU channel numbers. The table shows exemplary values of pump power and doped fibre length (Fibrecore Erbium Doped Fibre having the Giles spectra shown in Figure 3), for the DAM and DDM losses indicated. The gain of each length of EDF (other than EDF1) is defined as equal to the pass loss of a pair of DAM and DDMs; that is 0.6dB in this exemplary system, adjusted to improve system performance. The gain of EDF1 is selected to give an acceptable overall loss budget for the sensing system. In certain examples the gain of EDF1 may compensate for the entire loss of the system, or in other examples only a portion of the loss may be compensated for. The values shown in Figure 2 are for example only, and variations may occur with the design parameters. For example, an error window of +1-1dB for the gain of EDF1 is likely.
Figure 4 shows a chart of pump power against distance along the return riser fibre (calculated and test validated, in the chart, in terms of the channel number added. That is, channel 1 in Figure 4 corresponds to DAM 1 in Figure 1).
Figure 5 shows a chart of signal power at the input to the receiver against channel number for the parameters shown in Figure 2.
Figure 6 shows a chart of OSNR at the input to the receiver against channel number for the parameters shown in Figure 2.
Figure 7 shows a chart of optical power against Optical Frequency, showing the presence of optical noise from Amplified Spontaneous Emission (ASE) in the lengths of doped fibre. The signals correspond to the ITU channels shown in Figure 2. The shaping that can be seen between channels is due to the filtering of ASE by subsequent OAMs along the return multiplexer.
In order to select the lengths of doped fibre and pump power an algorithm may be utilised.
Figure 8 shows an exemplary algorithm which was utilised to prepare the system described in the table of Figure 2.
At block 800 the length of EDF1 is selected to provide a gain to give an acceptable overall loss for the sensor array. In certain examples the gain of EDF1 may compensate for the entire loss of the system, or in other examples only a portion of the loss may be compensated for.
At block 801 the length of doped fibres EDF2-EDF15 is selected so that each provides sufficient gain to make up for the loss of extra components associated with each channel (i.e. the loss through an 0DM in the transmission riser plus the loss of an OAM in the return riser) and to minimise channel inequality.
At block 802 the gains of the other lengths of fibre are selected. The additional insertion loss of each OAM/ODM pair is used as a base figure, with the actual gain been adjust to account for variations in the gain spectrum and other irregularities. In an example approximation the lengths (in metres) of doped fibre are selected according to the following adjustments (where IL = loss of an OAM/ODM in dB pair):-EDF2 to 6: IL+O. 1; EDF7to1O: IL-O.1; EDF11 to 14: 1.2*IL±O.1; EDF15: 1.5*IL±O.35; At block 802 the system is simulated to ensure sufficient pump power propagates to achieve the desired gains.
At block 803 the pump power may be adjusted to reduce differences in power between channels.
In further configurations additional pump sources may be multiplexed onto the return riser fibre to increase the pump power at the selected locations. For example, a first pump may be utilised to pump a first length of doped fibre located at the interrogator, with a second pump insert added after that first length of fibre for propagation through the remaining fibre lengths.
Furthermore, a co-propagating pump may be inserted at the distal end of the return riser fibre.
In alternative embodiments, the optical gain in the return riser may be provided by Raman amplification instead of doped fibre amplification. In such embodiments discrete lengths of fibre optimised to provide high Raman gain may be utilised in place of the doped fibre lengths.
Alternatively sufficient gain may be obtaining from the conventional transmission fibre.
The examples described hereinbefore demonstrate a system utilising remote pumping of doped fibres along a fibre carrying signals from optical sensors to a receiver. The pump light counter-propagates along the riser fibre and pumps a plurality of the lengths of fibre. The gain of each length of fibre approximately compensates for the additional losses incurred by a wavelength to which that length of fibre corresponds.
Any range or device value given herein may be extended or altered without losing the effect sought, as will be apparent to the skilled person. As will be appreciated the embodiment of 16 OSUs, each interrogated by a single wavelength is provided for example only and the numbers of OSUS and wavelengths may be varied without departing from the principles of the invention. It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages.
Any reference to an' item refers to one or more of those items. The term comprising' is used herein to mean including the method blocks or elements identified, but that such blocks or elements do not comprise an exclusive list and a method or apparatus may contain additional blocks or elements.
The steps of the methods described herein may be carried out in any suitable order, or simultaneously where appropriate. Additionally, individual blocks may be deleted from any of the methods without departing from the spirit and scope of the subject matter described herein. Aspects of any of the examples described above may be combined with aspects of any of the other examples described to form further examples without losing the effect sought.
It will be understood that the above description of a preferred embodiment is given by way of example only and that various modifications may be made by those skilled in the art.
Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the spirit or scope of this invention.
Claims (10)
- Claims 1. An optical sensing system, comprising a transmission optical fibre, a return optical fibre comprising discrete lengths of doped fibre for providing amplification to signals propagating in the return optical fibre, a plurality of optical sensor units optically coupled to the transmission optical fibre with wavelength selective couplers at distinct positions along that fibre and to the return optical fibre with wavelength selective couplers at distinct positions not within the discrete lengths of doped fibre, and a source of light optically coupled to the return optical fibre, the light output from the source being for pumping more than one of the lengths of doped fibre.
- 2. An optical sensing system according to claim 2, wherein the wavelength selective couplers couple at least one distinct wavelength to each sensor unit.
- 3. An optical sensing system according to any preceding claim, wherein the system is an undersea seismic sensing system.
- 4. An optical sensing system according to any preceding claim, wherein the discrete lengths of doped fibre are selected to provide a gain which compensates for the pass-channel loss of a pair of the wavelength selective couplers.
- 5. An optical sensing system according to any of claims ito 3, wherein the length of at least one of the discrete lengths of doped fibre is selected to provide a gain which compensates for the incremental loss incurred by a wavelength amplified for the first time by that at least one discrete length compared to the loss of a wavelength coupled to the return optical fibre at the next wavelength selective coupler after the at least one length of doped fibre.
- 6. An optical sensing system according to any preceding claims configured for sub-sea sensing, further comprising an interrogator system for transmitting light into the transmission optical fibre and receiving light from the return optical fibre.
- 7. An optical sensing system according to claim 6, wherein the sensing system is a sub-sea sensing system, the interrogator is located at a surface vessel, and the sensor array is located at the sea bed.
- 8. An optical sensing system according to claim 7, wherein the source of light is positioned at the interrogator system and the light is coupled into the return optical fibre at the interrogator system.
- 9. An optical sensing system according to claim 7, further comprising a second source of light optically coupled to the return optical fibre, the light output from the source being for pumping at least one of the lengths of doped fibre.
- 10. An optical sensing system according to claim 9, wherein the first or second source of light is coupled to the return optical fibre at a distal end of that return optical fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1205785.7A GB2500717A (en) | 2012-03-30 | 2012-03-30 | Optical sensing system with amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1205785.7A GB2500717A (en) | 2012-03-30 | 2012-03-30 | Optical sensing system with amplification |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201205785D0 GB201205785D0 (en) | 2012-05-16 |
| GB2500717A true GB2500717A (en) | 2013-10-02 |
| GB2500717A8 GB2500717A8 (en) | 2013-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1205785.7A Withdrawn GB2500717A (en) | 2012-03-30 | 2012-03-30 | Optical sensing system with amplification |
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| Country | Link |
|---|---|
| GB (1) | GB2500717A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2945395A3 (en) * | 2014-05-14 | 2015-11-25 | LSIS Co., Ltd. | Data processing device for high voltage direct current transmission system and method thereof |
| EP2945396A3 (en) * | 2014-05-14 | 2015-11-25 | LSIS Co., Ltd. | Data processing device and method for high voltage direct current transmission system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084233A (en) * | 1996-07-12 | 2000-07-04 | The Board Of Trustees Of Leland Stanford Junior University | Optical sensor array having multiple rungs between distribution and return buses and having amplifiers in the buses to equalize return signals |
| WO2000062021A1 (en) * | 1999-04-09 | 2000-10-19 | Qinetiq Limited | An optical fibre sensor assembly |
| JP2004013269A (en) * | 2002-06-04 | 2004-01-15 | Japan Marine Sci & Technol Center | Optical fiber wide area sensor system |
| GB2417627A (en) * | 2002-07-18 | 2006-03-01 | Pgs Americas Inc | Fiber optic seismic array system with telemetry fibres |
| EP2081053A2 (en) * | 2008-01-18 | 2009-07-22 | PGS Geophysical AS | Sensor Cable and Multiplexed Telemetry System For Seismic Cables Having Redundant/Reversible Optical Connections |
-
2012
- 2012-03-30 GB GB1205785.7A patent/GB2500717A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084233A (en) * | 1996-07-12 | 2000-07-04 | The Board Of Trustees Of Leland Stanford Junior University | Optical sensor array having multiple rungs between distribution and return buses and having amplifiers in the buses to equalize return signals |
| WO2000062021A1 (en) * | 1999-04-09 | 2000-10-19 | Qinetiq Limited | An optical fibre sensor assembly |
| JP2004013269A (en) * | 2002-06-04 | 2004-01-15 | Japan Marine Sci & Technol Center | Optical fiber wide area sensor system |
| GB2417627A (en) * | 2002-07-18 | 2006-03-01 | Pgs Americas Inc | Fiber optic seismic array system with telemetry fibres |
| EP2081053A2 (en) * | 2008-01-18 | 2009-07-22 | PGS Geophysical AS | Sensor Cable and Multiplexed Telemetry System For Seismic Cables Having Redundant/Reversible Optical Connections |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2945395A3 (en) * | 2014-05-14 | 2015-11-25 | LSIS Co., Ltd. | Data processing device for high voltage direct current transmission system and method thereof |
| EP2945396A3 (en) * | 2014-05-14 | 2015-11-25 | LSIS Co., Ltd. | Data processing device and method for high voltage direct current transmission system |
| US10211749B2 (en) | 2014-05-14 | 2019-02-19 | Lsis Co., Ltd. | Data processing device and method for high voltage direct current transmission system |
| US10250153B2 (en) | 2014-05-14 | 2019-04-02 | Lsis Co., Ltd. | Data processing device for high voltage direct current transmission system and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2500717A8 (en) | 2013-10-02 |
| GB201205785D0 (en) | 2012-05-16 |
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