JP4724798B2 - Optical fiber wide area sensor system - Google Patents

Description

  The present invention relates to a medium-scale optical fiber sensor array using a remote excitation amplification function that does not use a power source or the like in the field, and is a large-scale sensor array that incorporates a remote excitation amplification function. However, the present invention relates to a sensor system that is used in a more general network by utilizing a relay function.

  For ocean bottom earthquake observation, etc., construction of a remote and wide sensor array system is required.

  As a technique in such a field, for example, literature name: A. D. Kersey et al. , “Multiplexed Mach-Zehnder Ladder Array with Ten Sensor Elements” Electron. Lett. 25, 1298 (1989).

A time-division multiplex transmission type sensor array is shown in which a light pulse is transmitted from a light source and a time-series pulse of each sensor signal is formed via a delay line. The number of multiplexed sensor signals is mainly on the light receiving side. This is determined in consideration of the signal-to-noise ratio SNR.
None

  However, in the above-described conventional system configuration, the maximum possible transmission amount of signal light is restricted by the influence of nonlinear scattering or the like, and if the sensor array is extended to near 100 km, the number of multiplexing can be kept extremely low. Therefore, it is necessary to perform transmission loss compensation.

  Even when deploying a larger number of sensors on the seabed more remotely, in the case of a single array configuration (medium-scale configuration category), etc., in order to ensure reliability, electronic circuits etc. should be installed on site as much as possible. The use of a remote excitation light amplification function that is not required can be considered.

  However, the gain of optical amplification depends on the amount of input light, and even with propagated light of about 100 km, the signal arrival level is quite high, and a high gain that compensates for propagation loss cannot be obtained.

  Therefore, it is necessary to devise a configuration such as using optical amplification in a state where input light is reasonably lowered.

  In view of the above situation, the present invention provides an optical fiber wide-area sensor system that is configured to divide an array into subarrays that are also advantageous for reducing the power division loss of signal transmission light, and that can realize high gain. The purpose is to do.

In order to achieve the above object, the present invention provides
[1] A phase change of signal light is detected by interference, including a transmission / reception processing unit (20-i), a multiplexing / demultiplexing amplifier (30-i), and an array multiplexer / demultiplexer (40-i). Type sensor array system,
(A) the transmission and reception processing unit (20-i) is booth capacitor amplifier which is connected to the signal source (1) connected to the transmission gate (2) Toko transmission gate (2) to the signal source (1) ( 3) a signal light source unit (21), an outward transmission fiber connected to the signal light source unit (21), a light receiving unit (23) connected to the return transmission fiber, and the light receiving unit (23). DMUX (7) and a signal receiving unit having demodulation processing units (8-1, 8-2,...) Connected to the DMUX (7).
(B) The multiplexing / demultiplexing amplifier (30-i) includes a transmission / reception amplifier (31) that receives a signal from the signal light source unit (21), a multi-wavelength excitation light source (35), and the transmission / reception amplifier (31). And a transmission / reception coupler (32) connected to the multi-wavelength excitation light source (35), and two bus couplers (33-1, 33-2) connected to both sides of the transmission / reception coupler (32). And a bus amplifier (34) connected between the two bus couplers (33-1, 33-2),
(C) The array multiplexer / demultiplexer (40-i) includes two multiplexer / demultiplexers (41-1, 41-2) and the two multiplexer / demultiplexers (41-1, 41-). 2) array coupler are respectively connected to the (42-1), it is connected respectively to the array coupler (42-1), a remote amplifier (43-1) connected to the sub Buarei, the 2 And an excitation light demultiplexer (45-1) connected to both sides of each of the multiplexer / demultiplexers (41-1, 41-2) and connected to the remote amplifier (43-1). Features.

[2] In the optical fiber wide area sensor system according to [1], the array multiplexer / demultiplexer (40-i) for connecting the bus line and the sensor array includes two multiplexer / demultiplexers (41-1, combining 41-2) is connected to the sensor array only for a specific wavelength component, you characterized in that for other wavelength components is configured to perform the connections between the bus lines.

  [3] In the optical fiber wide area sensor system according to [1], the transmission / reception processing unit (20-i) and the multiplexing / demultiplexing amplifier (30-i) connecting the bus line to the transmission / reception processing unit (20-i). The input / output light dedicated amplifier (31) and the bus line passing light dedicated amplifier (34) are separated.

  [4] The optical fiber wide area sensor system according to [1], wherein a broadband coupler is provided between the transmission / reception processing unit (20-i) and the bus line, and between the bus line and the bus line.

  [5] In the optical fiber sensor system according to the above [4], the broadband coupler includes one transmission / reception coupler (32) and two bus couplers (33-1, 33-2). It is characterized by being.

  [6] The optical fiber wide-area sensor system according to [1], wherein the transmission / reception processing unit (20-i) includes a sensor signal sampling timing and synchronous detection based on a signal light wavelength selection and a signal light round-trip propagation distance. And a phase selection function for designating a sensor array.

According to the present invention, since it is configured as described above,
[A] The array is divided into sub-arrays that are also advantageous for reducing the power division loss of signal transmission light, and a remote post-amplifier is arranged between the transmission line and the sub-array to reduce input light. High gain can be realized.

  [B] The signal-to-noise ratio SNR depends on the optical amplifier output at which the input level is minimized (noise is noise generated by the amplifier). Since the signal light that has passed through the sensor array is very weak, the remote preamplifier can secure a gain that compensates for transmission loss and subarray division loss, and is placed as far away from the light receiving side as possible. Can be better estimated.

  For this reason, the remote preamplifier is also arranged between the subarray and the transmission line in order to secure the SNR and to increase the number of sensors.

  [C] Corresponding to a configuration in which a plurality of remote amplifiers are arranged, and in order not to reduce the amount of pumping light required for pumping by each remote amplifier, the pumping light is measured only at the corresponding pumping amplifiers by measuring the timing of passing the signal light. It can be supplied.

  [D] Propose the construction of a larger sensor system aimed at networking. In this case, it is generally beyond the scale that can be applied to remote excitation, the transmission trunk line system is configured as a repeater, and the sensor array itself assumes a configuration of remote excitation amplification.

  In the present invention, in particular, a plurality of transmission / reception processing units having signal light transmission / reception and processing functions are provided, and any sensor array can be shared by any transmission / reception processing unit.

  As described above in detail, according to the present invention, the following effects can be obtained.

  (1) A general-purpose sensor network using a repeater (transmission / reception amplifier, bus amplifier) can be formed while transmitting analog signals. Furthermore, the sensor array approached from the network has a remote excitation amplification function, so that transmission loss compensation can be sufficiently performed, the transmission distance can be greatly increased, and a remote, wider area sensor network can be constructed. Become.

  (2) An arbitrary sensor array can be selected from an arbitrary information center, and a general-purpose sensor network is possible.

  (3) Since the electronic circuit and the active switch are not used in the sensor array, the reliability of the system is further improved.

  (4) Although the effective transmission distance of the remote pumping light is limited to some extent, remote pumping amplification can be performed further remotely by arranging the pumping light source in the multiplexing / demultiplexing amplifier in which the power source is provided. In addition, it is easy to send the excitation light in both directions of the bus line via the idle input of the transmission / reception coupler.

  (5) In the connection between the transmission / reception processing unit and the bus line, a configuration in which the center incoming / outgoing light and the bus line transmission light are separated and amplified by a necessary minimum number can be used to reduce cost and simplify amplifier gain design. it can.

  (6) Connection between the transmission / reception processing unit and the bus line can be performed using a wide wavelength band component.

  (7) Since the remote excitation light is supplied by the adjacent multiplexing / demultiplexing amplifier, it has a redundant configuration for accidents such as disconnection of the cable between the transmission / reception processing unit and the multiplexing / demultiplexing amplifier that are likely to occur near the shore. Reliability can be improved.

The optical fiber wide area sensor system according to the present invention includes a transmission / reception processing unit (20-i), a multiplexing / demultiplexing amplifier (30-i), and an array multiplexer / demultiplexer (40-i). In the sensor array system that detects a phase change of light, the transmission / reception processing unit (20-i) includes a signal light source (1), a transmission gate (2) connected to the signal light source (1), and the transmission gate. a signal light source unit having a booth capacitor amplifier which is connected to (2) (3) (21), and the outgoing transmission fiber connected to the signal source (21), a light receiving unit (23 connected to the return transmission fiber ) And a signal receiving unit including a DMUX (7) connected to the light receiving unit (23) and a demodulation processing unit (8-1, 8-2,...) Connected to the DMUX (7). The multiplexing / demultiplexing amplifier (30-i) A transmission / reception amplifier (31) for receiving a signal from the signal light source unit (21), a multi-wavelength excitation light source (35), a transmission / reception unit connected to the transmission / reception amplifier (31) and the multi-wavelength excitation light source (35). The coupler (32), two bus couplers (33-1, 33-2) connected to both sides of the transmission / reception coupler (32), and the two bus couplers (33-1, 33-) 2) a bus amplifier (34) connected between the array multiplexer / demultiplexer (40-i) and two multiplexer / demultiplexers (41-1, 41-2) two demultiplexer (41-1, 41-2) in the array coupler are respectively connected to the (42-1), it is connected respectively to the array coupler (42-1), the support Buarei Of the remote amplifier (43-1) to be connected and the two multiplexers / demultiplexers (41-1, 41-2) It is connected to the side, and a excitation optical demultiplexer (45-1) connected to said remote amplifier (43-1).

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a configuration diagram of a multi-sensor system in which remote excitation amplifiers according to a reference example of the present invention are arranged.

  In this reference example, the remote excitation amplifier for signal light amplification is divided and arranged in the sensor array. The continuous light transmitted from the signal light source 1 is converted into a predetermined optical pulse, which will be described later, by the transmission gate 2, amplified by the booster amplifier 3, and incident on a long-distance outbound transmission fiber.

  The sensor array 4 is divided into sub-arrays 4-2-1 etc. via, for example, an array coupling coupler 4-1-1. The subarray 4-2-1 or the like has a structure in which the incident signal light is returned to the input side after detecting a predetermined signal, and further, a predetermined interval is provided between the sensor units in the subarray 4-2-1. The return light forms a pulse train. Each sensor unit is an interferometer composed of, for example, a sensing fiber and a reference fiber. The sensing fiber expands or contracts or changes its refractive index in response to earthquake acceleration, and generates a phase change of propagating light. By interfering with the reference fiber passing light, phase demodulation can be performed and signal detection becomes possible.

  At the subsequent stage of the array coupling coupler, for example, a remote post-amplifier 4-4-1 with an amplifier delay line 4-3-1 is arranged between the array coupling couplers 4-1-1 and 4-1-2. And amplifies the signal incident light to the connected sub-arrays 4-2-1 and 4-2-2 in the subsequent stage. A remote preamplifier 4-5-1 is arranged between the array coupling couplers 4-1-2 and 4-1-4 for amplifying the return light of the subarrays 4-2-1 and 4-2-2. To do. The same configuration is adopted for the other subarrays.

  The return light forming the pulse train is coupled by the array coupling coupler 4-1-4, propagates through the return path, is sent to the preamplifier 5, is amplified, square-detected by the O / E converter 6, and a sequence described later by the DMUX 7. As a result, the channel of the sensor signal is switched and sent to the demodulation processor 8-1 and the like. Each demodulator 8-1 demodulates a predetermined signal such as earthquake acceleration for each sensor based on a predetermined demodulation method.

  The remote postamplifier and the remote preamplifier are composed of an erbium doped fiber amplifier (EDFA), and require a predetermined high level of excitation light. The maximum incident light level of the excitation light is also limited by the action of nonlinear scattering or the like. For this reason, if a plurality of amplifiers are supplied simultaneously, a level drop due to division is inevitable.

  It is noted that in a sensor system that transmits in pulses and performs time division processing, only a specific time zone passes through each amplifier of signal light. In order to cause excitation of a specific amplifier, the light source is transmitted in a time division manner so as to reach the corresponding time. In addition, the excitation light has wavelength selectivity so that it can be extracted only by the corresponding amplifier.

  The excitation light sources 9-1, 9-2, etc. generate excitation lights having slightly different wavelengths, and supply them by switching to a predetermined amplifier with the excitation light switching unit 10 at a timing described later. On the sensor array side, the light is extracted by wavelength separation using an excitation light demultiplexer 4-6-1 or the like and supplied to each remote amplifier. In order to separate the supply time of the post-amplifier, the above-described amplifier delay lines 4-3-1 and 4-3-2 are set. For example, the amplifier delay lines 4-3-1 and 4-3-2 have a time delay equal to or greater than the pulse width of the signal light.

  The excitation light wavelength is the 1.5 μm band for signal light, and the 1.48 μm band is usually suitable.

  FIG. 2 is a diagram showing operation timings controlled by the timing controller 11 from the viewpoint of supply of pumping light and the like, and FIG. 2A shows a normal basic operation in this reference example.

  The signal light (output from the transmission gate 2) transmitted periodically is time-differenced to the remote post-amplifiers 4-4-1 and 4-4-2 due to the delay amount difference of the amplifier delay line 4-3-1. Reach with. In this configuration, the output from the remote postamplifier 4-4-1 is sent to the subarrays 4-2-1 and 4-2-2, and as shown by the input of the remote preamplifier 4-5-1, two subarrays are provided. Assume that the output signals from are set to appear alternately.

  Further, the output from the remote postamplifier 4-4-2 is input to the remote preamplifier 4-5-2 by the same operation, but as shown in the figure, the input of the remote preamplifier 4-5-1 and the remote preamplifier 4 are input. The arrival time of the signal light between the inputs of −5-2 is set by an array structure so that time separation is possible.

  Incidentally, after this signal light is returned to the return transmission fiber, the signal is selected by the DMUX 7 and demodulated based on the timing controller 11 based on the time control starting from the transmission timing. By a similar time control, the time at which the signal light reaches each remote amplifier is estimated (in the figure, the timing of the input of the excitation light demultiplexer 4-6), and is transmitted from the excitation light switch 10.

  FIG. 2B shows an example of timing control in the case where the remote excitation amplifier is used as a switch and the measurement is performed by sequentially switching the subarray after outputting all signals of the corresponding subarray. For example, for the first transmission signal light in the figure, neither the remote postamplifier 4-4-2 nor the remote preamplifier 4-5-2 in the return light is supplied with pumping light. This is equivalent to refusing.

  The remote postamplifier 4-4-1 and the remote preamplifier 4-5-1 are supplied as specified, and the next transmission signal is sequentially switched to operate another sub-array. Since only the sensor signals in the sub-array are included in the transmission signal interval, a large pulse duty ratio can be taken. If the number of subarray divisions is D, the duty ratio is approximately D times, and the number of sensors that can be covered by each subarray is approximately √D times.

  When the signal frequency of the measurement target to be handled is low, the sampling period can also be set low, and it is possible to switch after sequentially scanning all signals of the subarray. It is possible to expand the sub-array and thus the sensor array. This operation is also controlled by the timing controller 11, and the transmission cycle and pulse width are optimized (for example, the duty ratio is maximized) as appropriate.

  Since the remote post-amplifiers 4-4-1 and 4-4-2 can be suppressed at the maximum output, the signal light level is reduced to 1/2 by the division by the array coupling coupler, and further divided by the multi-stage coupling coupler. If it is arranged between stages divided by D (D is a power of 2), the signal light level drops to 1 / D, and the amplifier gain is increased to approximately D times. In terms of the increase in the number of sensors, as in the case described above, it is approximately √D times compared to the case where the sensor is arranged on the transmission fiber.

  In addition, since a weak signal light is input to the remote preamplifier, normally a high amplifier gain is obtained, and a gain sufficient to compensate for transmission loss and subarray division loss can be secured. By the way, the optical signal-to-noise ratio SNR defined by the EDFA or the like is determined by the optical amplifier output at which the input level is minimized because it is restricted by the noise of the EDFA. Therefore, as in the case of the remote postamplifier, the signal light level is increased by a factor of D when arranged between D-divided stages, and is approximately √D times in terms of the increase in the number of sensors.

  The reference example described above has the following effects.

  (1) Since the optical amplifier is provided in the sensor array, compensation for loss of signal light and loss of branching loss due to array division can be realized, and remote sensor array deployment is possible.

  (2) The amplification degree of the EDFA depends on the excitation power and the level of the input signal light. On the forward path side, the post-amplifier is disposed after the array coupling coupler in which the input signal level decreases, so that a high amplification degree is obtained and the transmission loss compensation effect is increased.

  (3) The amplification degree of the EDFA in the case of a minute signal input is high, and the remote preamplifier can obtain a gain that sufficiently compensates for the loss of the return transmission line and the loss of the branching loss due to the array division. Is improved.

  (4) If the sensor array is divided into sub-arrays, the total power consumption of signal light in the array including the branch loss to the sub-arrays can be reduced. In addition, the subarray structure is easily adapted to the realization of an array construction for observing earthquakes in a plane (lattice, radial, etc.).

  (5) Since the pumping light is time-division multiplexed using wavelength multiplexing, it can be supplied to a plurality of amplifiers so as not to cause a division loss, so that the ability to amplify can be secured.

  (6) When the measurement signal targets a low frequency, the excitation control of the remote amplifier is used as a switching function of the signal light passing therethrough, one signal array is associated with one subarray, and the pulse duty ratio of the signal light is It is possible to increase the number of sensors. Therefore, it is possible to construct a remote, wide-area sensor network.

  Next, examples of the present invention will be described.

  FIG. 3 is a system configuration diagram showing an embodiment of the present invention, in which an arbitrary sensor array can be shared by an arbitrary transmission / reception processing unit (information center or the like) as one form of sensor networking.

  Each of the transmission / reception processing units 20-i, 20-j, etc. includes a signal light source unit 21 including a signal light source 1 (referred to as a variable wavelength) of a reference example (see FIG. 1), a transmission gate 2, a booster amplifier 3, and the like. A return light extraction circulator 22 and a preamplifier 5 connected to the subsequent stage, a light receiving unit 23 newly composed of a variable wavelength filter, an O / E converter 6 and the like, a DMUX 7 for selecting a channel of a sensor signal, and a demodulation process It is composed of devices 8-1 and 8-2. The transmission timing and the sensor signal selection timing are sent from the timing controller 11. Further, a control parameter to be described later when switching an arbitrary sensor array is sent from the sensor switching controller 24.

  The array multiplexer / demultiplexers 40-i, 40-h, etc. combine two multiplexers / demultiplexers 41-1 and 41-2, and input / output only the signal light of a specific wavelength by wavelength selection. The multiplexer / demultiplexer has an arrayed waveguide diffraction grating function, and can perform input / output operation of only a specific wavelength component between the terminals (1) and (2), and other wavelengths between (1) and (3). Components can be input and output. (2)-(3) has no connection. Each array multiplexer / demultiplexer is set to select a different wavelength.

In the array multiplexer / demultiplexer 40-i, for example, when signal light of a specific wavelength λ _i is incident on the multiplexer / demultiplexer 41-1 (1), only the wavelength component is extracted to the array coupling coupler 42-1 side. . The extracted signal light performs the same operation as in the reference example (see FIG. 1), is remotely amplified and sent to the subarray, and the return light is returned to the multiplexer / demultiplexer 41-2 (1) side. It is. The remote amplifier 43-1 and the like amplify the round-trip propagation light as a post amplifier and a preamplifier.

On the other hand, with respect to other sensor array signal components (components other than the wavelength λ _i ), the multiplexer / demultiplexer 41-1 (1) and the multiplexer / demultiplexer 41-2 (2) pass through. Become. Further, the same operation as described above is performed for signal light incident from the side of the multiplexer / demultiplexer 41-2 (1).

  The pumping light transmitted from the multiplexing / demultiplexing amplifier 30-i, which will be described later, is wavelength-selected by the pumping light demultiplexers U44-1, 44-2, etc., and supplied to the remote amplifiers 43-1, 43-2, etc. Further, the wavelength of the excitation light transmitted from the multiplexing / demultiplexing amplifier 30-j is selected by the excitation light demultiplexers D45-1, 45-2 and the like and supplied to the remote amplifiers 43-1, 43-2 and the like. Both of the above-described excitation lights become excitation light for forward excitation or backward excitation of each remote amplifier.

  The multiplexer / demultiplexer 30-i and the like amplify the signal light from the transmission / reception processing unit 20-i by the transmission / reception amplifier 31, and the array multiplexer / demultiplexer via the transmission / reception coupler 32 and the bus coupler 33-1. Send to 40-i side. The signal light transmitted from the array multiplexer / demultiplexer 40-i side is taken in via the bus coupler 33-1 and the transmission / reception coupler 32, and amplified by the transmission / reception amplifier (input / output optical dedicated amplifier) 31, It has the function of returning the signal light to the transmission / reception processing unit 20-i and the like.

  Similarly, signal light from the transmission / reception processing unit 20-i and the like can be input / output to the array multiplexer / demultiplexer 40-h side in the other direction via the transmission / reception coupler 32 and the bus coupler 33-2. It is. The signal light traveling straight on the bus line can propagate while being amplified by passing through the bus amplifier (bus line passing light dedicated amplifier) 34 through the bus couplers 33-1 and 33-2.

  Further, in order to perform remote amplification in both adjacent sensor arrays such as the array multiplexers / demultiplexers 40-i and 40-h, a multi-wavelength excitation light source 35 is provided, and a transmission / reception coupler 32 and a bus coupler 33-1. Or excitation light is supplied via 33-2. Power is supplied to the multiplexing / demultiplexing amplifier 30-i or the like from the transmission / reception processor 20-i or the like.

In order for the transmission / reception processor 20-i to access the sensor array connected to the array multiplexer / demultiplexer 40-i, the sensor switching controller 24 designates the corresponding wavelength, for example, λ _i to the signal light source unit 21. Further, the light receiving unit 23 is designated so as to extract only the λ _i component of the return light. The channel selection timing corresponding to the round-trip propagation distance of the signal light is designated by the DMUX 7 via the timing controller 11, and the phase information for synchronous detection is designated by the demodulation processors 8-1, 8-2, etc.

The basic operation of signal light transmission / reception is the same as that of the reference example. When an optical pulse of wavelength λ _i is transmitted from the transmission / reception processing unit 20-i, it is amplified by the multiplexing / demultiplexing amplifier 30-i and bi-directional on the bus line. Sent out. On the bus line, signal light is captured only by the array multiplexer / demultiplexer corresponding to the wavelength λ _i , for example, 40-i, signal detection is performed by the sensor array including remote amplification, and the return from the sensor array. The light is returned to the bus line again by the array multiplexer / demultiplexer 40-i. The transmission / reception processing unit 20-i returns along the same path as the forward path, and after the wavelength is selected by the light receiving unit 23, a predetermined demodulation process is performed.

  Excitation light to a remote amplifier in a sensor array connected to an array multiplexer / demultiplexer, for example, 40-i, is supplied from both adjacent multiplexing / demultiplexing amplifiers, for example, multiplexing / demultiplexing amplifiers 30-i and 30-j. The corresponding amplifiers are combined and supplied together. As much as possible, the excitation light quantity will not decrease.

  According to the embodiment described above, the following effects are obtained.

  (1) A general-purpose sensor network using repeaters (transmission / reception amplifiers, bus amplifiers) can be formed while analog signals are transmitted, and the sensor array approached from the network has a remote excitation amplification function. Yes.

  (2) The transmission loss can be sufficiently compensated, the transmission distance can be greatly increased, and a remote, wider area sensor network can be constructed.

  (3) An arbitrary sensor array can be selected from an arbitrary information center, and a general-purpose sensor network is possible.

  (4) Since no electronic circuit or active switch is used in the sensor array, the reliability of the system is further improved.

  (5) Although the effective transmission distance of the remote pumping light is limited to some extent, the remote pumping amplification can be further performed remotely by arranging the pumping light source in the multiplexing / demultiplexing amplifier in which the power source is provided. In addition, it is possible to easily transmit the excitation light in both directions of the bus line through the empty input of the transmission / reception coupler.

  (6) In the connection between the transmission / reception processing unit and the bus line, a configuration in which the center incoming / outgoing light and the bus line transmission light are separated and amplified by a necessary minimum number can be used to reduce cost and simplify amplifier gain design.

  (7) Connection between the transmission / reception processing unit and the bus line can be performed using a wide wavelength band component.

  (8) Since the remote pumping light is supplied by the adjacent multiplexing / demultiplexing amplifier, it has a redundant configuration for accidents such as disconnection of the cable between the transmission / reception processing unit and the multiplexing / demultiplexing amplifier that are likely to occur near the shore. Reliability is improved.

  Furthermore, this invention has the following utilization forms.

  (1) In the embodiment, the remote postamplifier or remote preamplifier is described as a concentrated type using an EDFA, but a distributed type or a Raman amplifier that has an amplification action over a long section of the transmission line is used. All distribution types are also possible.

  (2) In the embodiment, the sensor array is configured by a subarray, but the subarray may be further configured by a subarray.

  (3) In the embodiment, the multiplexer / demultiplexer in the array multiplexer / demultiplexer is structured to be connected to the sensor array at the same wavelength, but it is also possible to use a connection method with different wavelength components.

  (4) In the embodiment, the signal light source and the transmission gate may be integrated.

  In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.

  The optical fiber wide area sensor system of the present invention can be used as a sensor system that is used in a more general network by utilizing a relay function.

It is a block diagram of the multiple sensor system which has arrange | positioned the remote excitation amplifier which shows the reference example of this invention. It is a figure which shows the operation timing shown from viewpoints, such as excitation light supply controlled by the timing controller which shows the reference example of this invention. FIG. 3 is a system configuration diagram showing an embodiment of the present invention, in which an arbitrary sensor array can be shared by an arbitrary transmission / reception processing unit (information center or the like) as one form of sensor networking.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Signal light source 2 Transmission gate 3 Booster amplifier 4 Sensor array 4-1-1,4-1-2,4-1-3,4-1-4, 42-1 Array coupling coupler 4-2-1,4- 2-2 Subarray 4-3-1, 4-3-2 Delay line for amplifier 4-4-1, 4-4-2 Remote post-amplifier 4-5-1, 4-5-2 Remote preamplifier 4-6 1, 44-1, 44-2, 45-1, 45-2 Excitation light demultiplexer 5 Preamplifier 6 O / E converter 7 DMUX
8-1, 8-2 Demodulation processor 9-1, 9-2 Excitation light source 10 Excitation light switch 11 Timing controller 20-i, 20-j Transmission / reception processing unit 21 Signal light source unit 22 Return light extraction circulator 23 Light reception Unit 24 Sensor switching controller 30-i, 30-j Multiplexing / demultiplexing amplifier 31 Transmission / reception amplifier 32 Transmission / reception coupler 33-1, 33-2 Bus coupler 34 Bus amplifier 35 Multi-wavelength excitation light source 40-i, 40- h Array multiplexer / demultiplexer 41-1, 41-2 Multiplexer / demultiplexer 43-1, 43-2 Remote amplifier

Claims (6)

In a sensor array system that includes a transmission / reception processing unit, a multiplexing / demultiplexing amplifier, and an array multiplexer / demultiplexer that detects a phase change of signal light by interference,
(A) the transmission and reception processing section, a signal light source unit having a booth capacitor amplifier which is connected to the transmission gate and the transmission gate connected to the signal source and the signal light, outgoing transmission fiber connected to the signal source unit If consists of a receiver and a signal receiver having a demodulation processing unit which is connected to the DMUX and the DMUX connected to the light receiving portion and the light receiving section connected to the return transmission fiber,
(B) The multiplexing / demultiplexing amplifier includes a transmission / reception amplifier that receives a signal from the signal light source unit, a multi-wavelength excitation light source, a transmission / reception coupler connected to the transmission / reception amplifier and the multi-wavelength excitation light source, and the transmission / reception amplifier. It consists of two bus couplers connected on both sides of the receiving coupler and a bus amplifier connected between the two bus couplers,
(C) The array multiplexer / demultiplexer includes two multiplexers / demultiplexers, an array coupler connected to each of the two multiplexers / demultiplexers, and an array coupler. and a remote amplifier connected to sub Buarei, is connected to both sides of the two demultiplexer, optical fiber wide area sensor, characterized in that it comprises an excitation optical demultiplexer connected to said remote amplifier system. Connection according to claim 1 optical fiber wide sensor system according the array for demultiplexer for connecting the bus Surain and sensor array, combines two demultiplexer, and the sensor array only for a particular wavelength component The optical fiber wide-area sensor system is configured to connect the bus lines to other wavelength components. 2. The optical fiber wide area sensor system according to claim 1, wherein the multiplexing / demultiplexing amplifier for connecting the transmission / reception processing unit and the bus line is separated into an input / output light dedicated amplifier and a bus line passing light dedicated amplifier for the transmission / reception processing unit. Optical fiber wide area sensor system. 2. The optical fiber wide area sensor system according to claim 1, wherein a broadband coupler is provided between the transmission / reception processing unit and the bus line, and between the bus line and the bus line. 5. The optical fiber wide-area sensor system according to claim 4, wherein the broadband coupler is composed of one transmission / reception coupler and two bus couplers. The optical fiber wide area sensor system according to claim 1, wherein the transmission / reception unit has a wavelength selection of the signal light and a phase selection function for synchronous detection of the sensor signal sample timing based on the round-trip propagation distance of the signal light, An optical fiber wide area sensor system characterized by designating a sensor array.

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