CN115037373B - Optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission - Google Patents
Optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission Download PDFInfo
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- CN115037373B CN115037373B CN202210659960.3A CN202210659960A CN115037373B CN 115037373 B CN115037373 B CN 115037373B CN 202210659960 A CN202210659960 A CN 202210659960A CN 115037373 B CN115037373 B CN 115037373B
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
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- 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
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
Abstract
The invention discloses an optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission, which belongs to the field of light pulse transmission and comprises a multi-wavelength light pulse input end, a multi-wavelength light pulse peak-shifting output end, at least two broadband splitters and broadband combiners; the multi-wavelength optical pulse input end is used for inputting multi-wavelength optical pulses; the broadband splitters and the broadband combiners are respectively connected in series to form a row, and an output end A for outputting the wavelength in the selected wavelength range in the broadband splitters is connected with an input end X for inputting the wavelength in the selected wavelength range in the broadband combiners in a one-to-one correspondence manner in sequence; the input end of the most upstream broadband wave separator is connected with the input end of the multi-wavelength optical pulse, and the output end of the most downstream broadband wave combiner is connected with the output end of the multi-wavelength optical pulse peak shifting; and delay coils are connected between two adjacent broadband wave splitters. The invention has the advantages of less number of required optical devices, effective suppression of nonlinear optical fiber effect in the signal transmission process and improvement of detection performance of the optical fiber hydrophone array.
Description
Technical Field
The invention relates to the field of optical pulse transmission, in particular to an optical device for optical fiber hydrophone array polling optical pulse peak-shifting transmission.
Background
The optical fiber hydrophone has the advantages of high sensitivity, strong electromagnetic interference resistance, large dynamic range, small volume, light weight, good fitting property and the like, and is convenient to form an array through space division, time division and wavelength division mixed multiplexing, so that the optical fiber hydrophone has increasingly application in the fields of marine acoustic environment detection, underwater security, marine petroleum exploration, marine geological investigation and the like.
With the development of technology, fiber optic hydrophones have evolved toward large-scale arrays and deep open sea applications, and particularly in land-based arrays, the increasing array scale and number of units has been a trend of development. Space division multiplexing is limited by the additional fiber core count that is consumed due to the constraints of submarine cable fiber resources, and thus, great effort is required to increase the multiplexing level of wavelength division multiplexing and time division multiplexing.
For time division multiplexing, because the optical pulse width of the array is limited by the requirements of a demodulation algorithm and the performances of devices such as an acousto-optic modulator, a photoelectric detector, an ADC (analog to digital converter) and the like, a minimum pulse width exists, the increase of the time division number can reduce the sampling repetition frequency of the array under the condition that each optical pulse width is unchanged, so that the self-noise, the dynamic range and other key performances of the array are affected. On the other hand, increasing the number of time division multiplexing results in increased array loss and increased high frequency noise aliasing effects, thereby affecting the final performance of the array. Thus, increasing the level of wavelength division multiplexing becomes a necessary option.
However, as the number of wavelength components increases, the number of time-division components is unchanged, and the same time-division components must overlap the light pulses of a plurality of wavelength components. Along with the increase of the scale of the optical fiber hydrophone array and the increase of the transmission distance, the power requirement on the polling light pulse is also increased, and in a high-power pulse state, a serious four-wave mixing effect can be generated between different wavelengths, and meanwhile, the phenomenon of energy transfer from short waves to long waves (the larger the wavelength difference is, the more serious the phenomenon is) can be generated in the transmission process, so that the problems of wavelength flatness degradation, mutual crosstalk among wavelengths and the like are caused. In addition, when the optical fiber amplifier amplifies low duty ratio pulse power and outputs high power pulse, pulse waveform distortion phenomenon is easily generated, and finally the detection performance of the array is influenced.
In view of the above problems, document 1 (CN 110266392 a) proposes an optical fiber hydrophone optical transmitter based on multi-wavelength optical pulse peak-shifting amplification, which sequentially delays low duty optical pulses output in the same period of multiple wavelengths to the spare period of the pulse period, so as to suppress nonlinear effects during amplification and transmission; document 2 (CN 111928936 a) proposes an optical transmitting device for an optical fiber hydrophone array, which performs power pre-emphasis to improve long-distance transmission performance while dividing a multi-wavelength optical pulse into wavelength-delayed off-peak outputs. However, the technical schemes of the documents are all to carry out wave division and delay treatment on a single wavelength, and have the disadvantages of large number of optical devices and relatively complex structure; in addition, when the number of the wavelength division multiplexing exceeds the number of the time division multiplexing and the optical pulses with different wavelengths still exist to overlap each other, the method overlaps different wavelengths with larger wavelength numerical values, so that the energy transfer from short waves to long waves in the transmission process is not easy to inhibit.
Therefore, it is necessary to develop an optical device for transmitting the polling light pulse off-peak with relatively simple structure, small number of optical devices and good nonlinear effect suppression effect in the transmission process, so as to meet the application requirements of the optical fiber hydrophone array.
Disclosure of Invention
Aiming at the problems of the prior art that the device has more requirements on the number of optical devices and the nonlinear effect in the transmission process is poor, the invention aims to provide an optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission comprises a multi-wavelength light pulse input end, a multi-wavelength light pulse peak-shifting output end, at least two broadband wave splitters and the same number of broadband wave combiners;
the multi-wavelength optical pulse input end is used for inputting multi-wavelength optical pulses, the multi-wavelength optical pulses comprise at least two wavelengths, and the number of the wavelengths contained in the multi-wavelength optical pulses is larger than or equal to that of the broadband splitters;
the broadband wave splitters comprise an input end, an output end A and an output end B, wherein the output end A is used for outputting the wavelength in a selected wavelength range, the output end B is used for outputting other wavelengths, and each broadband wave splitter is connected in series to form a row through the input end and the output end B; the broadband combiner comprises an X input end, a Y input end and an output end, wherein the X input end is used for inputting the wavelength in the selected wavelength range, the Y input end is used for inputting other wavelengths, and the broadband combiners are connected in series through the Y input end and the output end to form a row; the input end of the broadband multiplexer positioned at the most upstream of the optical signal transmission path is connected with the multi-wavelength optical pulse input end, and the output end of the broadband multiplexer positioned at the most downstream of the optical signal transmission path is connected with the multi-wavelength optical pulse peak shifting output end;
the A output end of each broadband wave separator is respectively connected with the X input end of each broadband wave combiner in a one-to-one correspondence in sequence, delay coils are connected in series between two adjacent broadband wave separators, and the multi-wavelength optical pulse peak-shifting output end is used for outputting an optical pulse sequence separated according to a wavelength range.
Preferably, the B output end of the broadband demultiplexer located at the most downstream of the optical signal transmission path and the Y input end of the broadband multiplexer located at the most upstream of the optical signal transmission path are both empty and perform tail fiber attenuation processing.
Preferably, the set of wavelength ranges corresponding to the a output end of each of the broadband splitters covers all wavelengths included in the multi-wavelength optical pulse input end.
Preferably, the wavelength range corresponding to the a output end of each wideband demultiplexer is a continuous interval.
Preferably, the wavelength ranges corresponding to the a output ends of the broadband splitters are different.
Preferably, on the optical signal transmission path, the wavelength values included in the wavelength range corresponding to the a output end of each of the broadband splitters sequentially increase.
Preferably, the number of wavelengths selected from all wavelengths of the multi-wavelength optical pulse at the a output end of each broadband demultiplexer is the same or different by 1.
Preferably, the delay coils are optical fibers, and the lengths of the delay coils are the same.
Preferably, the length of the delay coil i=c×t/(n×n); wherein c is the speed of light in vacuum, T is the period of receiving the multi-wavelength light pulse by the multi-wavelength light pulse input end, N is the refractive index of the fiber core in the delay coil, and N is the number of the broadband splitters.
By adopting the technical scheme, the invention has the beneficial effects that: the invention expands single light pulse with low duty ratio (comprising a plurality of wavelengths) into the light pulse sequence with the duty ratio close to 100%, thereby greatly reducing the peak power of the transmission line and effectively inhibiting the nonlinear effect of the optical fiber; the total number of the broadband wave splitters and the broadband wave combiners through which the light pulses of each wavelength pass is the same, and the generated insertion loss is basically the same, so that the consistency of the light power of different wavelengths is maintained; the broadband wave separator and the broadband wave combiner are adopted to process the multi-wavelength light pulse according to the wavelength range, so that a pair of the broadband wave separator and the broadband wave combiner which are connected with each other can process a plurality of wavelengths, the use quantity of optical devices is reduced, the structure of the device is simplified, and the cost is reduced; especially when the number of the wavelength division multiplexing exceeds the number of the time division multiplexing and the light pulses with different wavelengths still overlap each other, the invention only has the light pulses with adjacent wavelengths in the same wavelength range to overlap, and the separated light pulses with different wavelength ranges can not overlap again, thereby avoiding the situation that different wavelengths with larger wavelength numerical value difference are overlapped together, and effectively inhibiting the energy transfer from short waves to long waves in the transmission process.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 shows the input of the device of the present invention comprising lambda 1 ～λ M A pulse timing diagram of a multi-wavelength optical pulse of a total of M wavelengths;
fig. 3 is a timing diagram of an optical pulse sequence formed by separating multi-wavelength optical pulses according to wavelength ranges output by the device of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
It should be noted that, in the description of the present invention, the positional or positional relation indicated by the terms such as "upper", "lower", "left", "right", "front", "rear", etc. are merely for convenience of describing the present invention based on the description of the structure of the present invention shown in the drawings, and are not intended to indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first" and "second" in this technical solution are merely references to the same or similar structures, or corresponding structures that perform similar functions, and are not an arrangement of the importance of these structures, nor are they ordered, or are they of a comparative size, or other meaning.
In addition, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two structures. It will be apparent to those skilled in the art that the specific meaning of the terms described above in this application may be understood in the light of the general inventive concept in connection with the present application.
An optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission is used for converting multi-wavelength light pulses containing multiple wavelengths into light pulse sequences separated according to wavelength ranges, so that the device of the embodiment can be used for optical fiber hydrophone array polling light pulse peak-shifting transmission, and can effectively inhibit optical fiber nonlinear effects in a signal transmission process, thereby improving the detection performance of the optical fiber hydrophone array.
As shown in fig. 1, the device comprises a multi-wavelength optical pulse input end, a multi-wavelength optical pulse peak-shifting output end, at least two broadband splitters and the same number of broadband combiners.
The multi-wavelength optical pulse input end is used for inputting multi-wavelength optical pulses, the multi-wavelength optical pulses comprise at least two wavelengths, such as M wavelengths, and the number M of the wavelengths contained in the multi-wavelength optical pulses is greater than or equal to the number N of the broadband splitters.
The broadband splitter comprises an input end, an output end A and an output end B, wherein the output end A is used for outputting the wavelength in the selected wavelength range, the output end B is used for outputting other wavelengths, and each broadband splitter is connected in series by taking optical fibers as media through the input end and the output end B to form a row, namely a first path. That is, the output end a is used for separating and outputting the wavelength in the selected wavelength range from the broadband demultiplexer, and the optical signals of other wavelengths in the broadband demultiplexer are transmitted downstream along the first path.
The broadband combiner comprises an X input end, a Y input end and an output end, wherein the X input end is used for inputting the wavelength in the selected wavelength range, the Y input end is used for inputting other wavelengths, and each broadband combiner takes optical fibers as media and is connected in series through the Y input end and the output end to form a row, namely a second path. That is, the X input is used to input wavelengths in a selected wavelength range to the broadband combiner so that they are transmitted along the second path.
In this embodiment, the a output ends of the wideband splitters are respectively connected to the X input ends of the wideband combiners in a one-to-one correspondence (along the optical signal transmission path). And delay coils are connected in series between two adjacent broadband splitters, namely the output end B of the broadband splitter positioned on the upstream side in the first path is connected with the input end of the broadband splitter positioned on the downstream side through the delay coils, so that corresponding delay occurs when an optical signal is transmitted on the first path through one delay coil. The input end of the broadband wave separator positioned at the most upstream of the optical signal transmission path is connected with the multi-wavelength optical pulse input end, the output end of the broadband wave combiner positioned at the most downstream of the optical signal transmission path is connected with the multi-wavelength optical pulse peak-shifting output end, and the multi-wavelength optical pulse peak-shifting output end is used for outputting an optical pulse sequence separated according to a wavelength range.
In this embodiment, the a output ends of the wideband splitters are respectively connected to the X input ends of the wideband combiners in a one-to-one correspondence in sequence, which can be understood as follows: the A output end of the first broadband multiplexer on the first path is connected with the X input end of the first broadband multiplexer on the second path through an optical fiber, and the wavelength range corresponding to the A output end of the first broadband multiplexer is the same as the wavelength range corresponding to the X input end of the first broadband multiplexer on the second path; the A output end of the second broadband multiplexer on the first path is connected with the X input end of the second broadband multiplexer on the second path through an optical fiber, and the wavelength range corresponding to the A output end of the second broadband multiplexer is the same as the wavelength range corresponding to the X input end of the second broadband multiplexer on the second path; and so on until the A output end of the last wideband demultiplexer on the first path is connected with the X input end of the last wideband combiner on the second path through the optical fiber, and the wavelength range corresponding to the A output end of the last wideband demultiplexer on the first path is the same as the wavelength range corresponding to the X input end of the last wideband combiner on the second path.
In this embodiment, as shown in fig. 1, each wideband demultiplexer is configured to include a first wideband demultiplexer, a second wideband demultiplexer, an i-th wideband demultiplexer and an N-th wideband demultiplexer that are sequentially connected, the wideband multiplexer includes a first wideband multiplexer, a second wideband multiplexer, an i-th wideband multiplexer and an N-th wideband multiplexer that are sequentially connected, and the delay coil includes a first delay coil, a second delay coil, an i-th delay coil and an N-1 delay coil, where i and N are natural numbers, i is a natural number between 1 and N, and N is greater than or equal to 2. Therefore, in the connection structure between the wideband demultiplexer and the wideband combiner, the technical solution of this embodiment is described as follows: the output end A of the first broadband wave separator is connected with the input end X of the first broadband wave separator through optical fibers, and the output end B of the first broadband wave separator is connected with the input end of the second broadband wave separator through a first delay coil; the Y input end of the first broadband combiner is empty and carries out tail fiber attenuation treatment, and the output end of the first broadband combiner is connected with the Y input end of the second broadband combiner through optical fibers; by the pushing, the input end of the ith broadband wave separator is connected to the B output end of the ith-1 broadband wave separator through the ith-1 delay coil, the A output end of the ith broadband wave separator is connected to the X input end of the ith broadband wave combiner through an optical fiber, and the B output end of the ith broadband wave separator is connected to the input end of the ith+1 broadband wave separator through the ith delay coil; the Y input end of the ith broadband combiner is connected with the output end of the ith-1 broadband combiner through an optical fiber, and the output end of the ith broadband combiner is connected with the Y input end of the (i+1) th broadband combiner through an optical fiber; by the pushing, the input end of the Nth broadband wave separator is connected to the B output end of the Nth broadband wave separator through the N-1 delay coil, the A output end of the Nth broadband wave separator is connected with the X input end of the Nth broadband wave combiner through optical fibers, and the B output end of the Nth broadband wave separator is empty and carries out tail fiber attenuation treatment; the Y input end of the N-th broadband combiner is connected with the output end of the N-1-th broadband combiner through optical fibers.
In this embodiment, the set of wavelength ranges corresponding to the a output end of each broadband demultiplexer is configured to cover all wavelengths included in the multi-wavelength optical pulse input end, so as to avoid missing wavelengths in the multi-wavelength optical pulse. In addition, the wavelength range corresponding to the A output end of each broadband demultiplexer is configured to be a continuous interval, and the wavelength ranges corresponding to the A output ends of the broadband demultiplexers are different and do not overlap, so that one or more wavelengths in the same wavelength range can be separated from the first path only by one broadband demultiplexer.
For example, M wavelengths included in the original input multi-wavelength light pulse are ordered from small to large in wavelength value and are marked as lambda 1 ～λ M Where M denotes the number of wavelengths, i.e. the multi-wavelength light pulse is one light pulse, but it contains M wavelengths. It will be appreciated that in order to minimize the investment in optical devices, the number of wideband splitters N is typically less than or equal to M, and in order to make best use of the object as possible, each wideband splitter should be configured to be in use, i.e. the A output of each wideband splitter can be controlled from λ 1 ～λ M One or more wavelengths are selected from the M wavelengths, and the set of wavelength ranges corresponding to the A output end of all the broadband splitters should cover lambda 1 ～λ M Is a single wavelength, and is all M wavelengths. Specifically, the wavelengths corresponding to the configuration of each wideband demultiplexer for demultiplexing are λ in order b1 ～λ e1 、λ b2 ～λ e2 、λ bi ～λ ei 、…、λ bN ～λ eN Wherein lambda is bi ～λ ei Representing a number of discrete wavelengths,λ bi lambda is lambda bi ～λ ei Wavelength lambda with minimum value ei Lambda is lambda bi ～λ ei Wavelength of maximum median value, lambda bi ～λ ei Is lambda 1 ～λ M A plurality of wavelengths with consecutive intermediate order positions, lambda b1 ～λ e1 、λ b2 ～λ e2 、…、λ bN ～λ eN Arranged in order of the wavelength from small to large, namely lambda 1 ～λ M 。
In this embodiment, in view of load balancing and minimizing peak pulse power, the number of wavelengths selected from all wavelengths of the multi-wavelength optical pulse by the a output end of each wideband demultiplexer is further configured to be the same or different by 1. That is, M wavelengths included in the multi-wavelength optical pulse are equally demultiplexed from the A output ends of N broadband demultiplexers, the number of wavelengths separated by each broadband demultiplexer is M/N, and when M/N is a non-integer, the number of wavelengths separated by the broadband demultiplexer is [ M/N ] or [ M/N ] +1, where [ M/N ] represents a maximum integer not greater than M/N.
In use of the present embodiment, as shown in FIG. 2, the multi-wavelength light pulse is a single light pulse comprising lambda 1 ～λ M M wavelengths are added, and the multi-wavelength light pulse is set to have period of T and pulse width of T p Is input to the multi-wavelength optical pulse input end and then to the input end of the first broadband demultiplexer, lambda b1 ～λ e1 The wavelength is separated first, transmitted to the first broadband combiner and output through the second path; the residual wavelength is delayed by the first delay coil and then input to the input end of the second broadband demultiplexer after a certain time delay b2 ～λ e2 The wavelengths are separated and transmitted to a second broadband combiner, and output through a second path; the rest wavelength is delayed when passing through the second delay coil, and is input to the input end of the third broadband demultiplexer after being delayed for a certain time; and so on up to lambda bN ～λ eN The wavelength is input to the input end of the N broadband demultiplexer after being delayed by a certain time by the N-1 delay coil, at the moment lambda bN ～λ eN The wavelengths are separated and transmitted to an nth broadband combiner and output via a second path. Up to this point, it contains lambda 1 ～λ M The multi-wavelength optical pulses of the total M wavelengths are output in the form of an optical pulse train separated by wavelength ranges, as shown in fig. 3. According to the technical scheme, the single optical pulse with the low duty ratio is expanded into the optical pulse sequence with the duty ratio close to 100%, so that the peak power of a transmission line is greatly reduced, and the nonlinear effect of the optical fiber is effectively restrained.
As shown in FIG. 3, it is shown that the composition contains lambda 1 ～λ M A time sequence diagram of an optical pulse sequence formed by separating multi-wavelength optical pulses with M wavelengths according to a wavelength range, wherein tau represents a time interval between rising edges (or falling edges) of two adjacent optical pulses, namely delay generated by a delay coil, and is configured with tau=T/N being equal to or greater than T p So as to avoid overlapping between adjacent light pulses, and simultaneously, uniformly distribute N light pulses in a period T, thereby maximally reducing pulse peak power.
The length of the delay coil is determined by the delay amount τ, the length of the delay coil i=c×τ/n=c×t/(n×n), where c is the speed of light in vacuum and N is the refractive index of the fiber core in the delay coil.
As can be seen by comparing FIGS. 2 and 3, there is included lambda 1 ～λ M After the multi-wavelength optical pulses with the total M wavelengths are input into the device, the multi-wavelength optical pulses are finally output in the form of an optical pulse sequence separated according to the wavelength range, so that single optical pulses with low duty ratio are expanded into an optical pulse sequence with the duty ratio close to 100%, the peak power of a transmission line is greatly reduced, and the nonlinear effect of an optical fiber is effectively restrained.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (9)
1. An optical device for optical fiber hydrophone array polling light pulse peak-shifting transmission, which is characterized in that: the device comprises a multi-wavelength optical pulse input end, a multi-wavelength optical pulse peak-shifting output end, at least two broadband wave splitters and the same number of broadband wave combiners;
the multi-wavelength optical pulse input end is used for inputting multi-wavelength optical pulses, the multi-wavelength optical pulses comprise at least two wavelengths, and the number of the wavelengths contained in the multi-wavelength optical pulses is larger than or equal to that of the broadband splitters;
the broadband wave splitters comprise an input end, an output end A and an output end B, wherein the output end A is used for outputting the wavelength in a selected wavelength range, the output end B is used for outputting other wavelengths, and each broadband wave splitter is connected in series to form a row through the input end and the output end B; the broadband combiner comprises an X input end, a Y input end and an output end, wherein the X input end is used for inputting the wavelength in the selected wavelength range, the Y input end is used for inputting other wavelengths, and the broadband combiners are connected in series through the Y input end and the output end to form a row; the input end of the broadband multiplexer positioned at the most upstream of the optical signal transmission path is connected with the multi-wavelength optical pulse input end, and the output end of the broadband multiplexer positioned at the most downstream of the optical signal transmission path is connected with the multi-wavelength optical pulse peak shifting output end;
the A output end of each broadband wave separator is respectively connected with the X input end of each broadband wave combiner in a one-to-one correspondence in sequence, delay coils are connected in series between two adjacent broadband wave separators, and the multi-wavelength optical pulse peak-shifting output end is used for outputting an optical pulse sequence separated according to a wavelength range.
2. The apparatus according to claim 1, wherein: and the B output end of the broadband wave splitter positioned at the most downstream of the optical signal transmission path and the Y input end of the broadband wave combiner positioned at the most upstream of the optical signal transmission path are all empty and carry out tail fiber attenuation treatment.
3. The apparatus according to claim 1, wherein: and the set of the wavelength ranges corresponding to the A output end of each broadband demultiplexer covers all wavelengths contained in the multi-wavelength optical pulse input end.
4. A device according to claim 3, characterized in that: the wavelength range corresponding to the A output end of each broadband demultiplexer is a continuous interval.
5. The apparatus according to claim 4, wherein: the corresponding wavelength ranges of the A output ends of the broadband splitters are different.
6. The apparatus according to claim 5, wherein: on the optical signal transmission path, the wavelength values included in the wavelength range corresponding to the a output end of each broadband demultiplexer are sequentially increased.
7. The apparatus according to claim 6, wherein: the number of wavelengths selected from all wavelengths of the multi-wavelength optical pulse by the A output end of each broadband demultiplexer is the same or different by 1.
8. The apparatus according to claim 1, wherein: the delay coils are optical fibers, and the lengths of the delay coils are the same.
9. The apparatus according to claim 8, wherein: the length of the delay coil l=c×t/(n×n); wherein c is the speed of light in vacuum, T is the period of receiving the multi-wavelength light pulse by the multi-wavelength light pulse input end, N is the refractive index of the fiber core in the delay coil, and N is the number of the broadband splitters.
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| CN110595604A (en) * | 2019-09-16 | 2019-12-20 | 武汉理工大学 | High-dynamic-range dual-wavelength distributed optical fiber vibration demodulation system and method |
| CN111928936A (en) * | 2020-07-31 | 2020-11-13 | 中科长城海洋信息系统有限公司 | Light emitting device for optical fiber hydrophone array |
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| JP2001183714A (en) * | 1999-12-27 | 2001-07-06 | Kddi Corp | Optical waveform shaping device |
| EP2860498B1 (en) * | 2013-10-09 | 2017-12-06 | Optoplan AS | Processing data from a distributed fibre-optic interferometric sensor system |
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| CN110595604A (en) * | 2019-09-16 | 2019-12-20 | 武汉理工大学 | High-dynamic-range dual-wavelength distributed optical fiber vibration demodulation system and method |
| CN111928936A (en) * | 2020-07-31 | 2020-11-13 | 中科长城海洋信息系统有限公司 | Light emitting device for optical fiber hydrophone array |
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