CN210109533U - Stack system for realizing optical signal based on time lens imaging system - Google Patents
Stack system for realizing optical signal based on time lens imaging system Download PDFInfo
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- CN210109533U CN210109533U CN201920752513.6U CN201920752513U CN210109533U CN 210109533 U CN210109533 U CN 210109533U CN 201920752513 U CN201920752513 U CN 201920752513U CN 210109533 U CN210109533 U CN 210109533U
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Abstract
A 'stack' system for implementing optical signals based on a time lens imaging system, the system comprising an optical signal launch terminal section, a time lens imaging inversion subsection and an optical signal receive terminal section, the optical signal launch terminal section implementing delivery of an input pulse train to the time lens imaging inversion subsection; the time lens imaging inversion subsection realizes inversion of a pulse sequence; the optical signal receiving terminal part realizes the transmission of the output pulse sequence to the next stage. Through the combined action of the three parts of the system, the last-in first-out 'stack' technology of the optical signal is realized. The utility model discloses can be applied to and handle the required "stack" data structure of compiling, system conversion scheduling problem in the future optical computer.
Description
Technical Field
The utility model relates to a "stack" system based on optical signal is realized to time lens imaging system.
Background
A stack (stack) is a linear table with Last In First Out (LIFO) which only allows data insertion and deletion at one end of the table. The characteristics of the stack enable the stack to be widely applied to the field of electronic computers, and are commonly used for solving the problems of value solving of an expression by an operator priority algorithm, bracket matching of the expression, maze path solving, Fibonacci problems, binary conversion and the like. The stack is such that the writing and reading of data does not need to provide specific addresses, but the order of reading is determined directly from the reverse order of the order of writing. With the rapid development of technology, the special structure of "last-in first-out" is also applied in other fields, such as optical computers. Different from the traditional silicon chip computer, the optical computer utilizes light beams to replace electrons for calculation and storage, has higher operating efficiency and fault tolerance rate, uses a 'stack' technology when processing problems of compiling, binary conversion and the like, and is an important part for realizing optical calculation.
A time lens refers to an optical device capable of producing a quadratic time phase shift on an optical signal. In signal processing in the field of optical communications, four-wave mixing (FWM) is preferably used to achieve the time-lensing effect. Electric field amplitude of Es(t) and Ep(t) the signal light and the pump light have FWM effect, and the generated idle wave electric field amplitude
Idle light EidlerWith respect to the input signal light EsThe second order phase shift is introduced, which is the basic principle of FWM to produce temporal lensing.
The input section of the optical fiber (the second-order dispersion is phi ″)1＝β2sLs) Time lens (focal length dispersion phi ″)f＝-φ″p/2＝-β2pLp/2) and output section optical fiber (second-order dispersion is phi ″)2＝β2iLi) The three parts form a time lens imaging system. The dispersion of the front and rear optical fibers is phi ″', respectively1＝β2sLs，φ″2＝β2iLiThe focal length dispersion of the time lens is determined entirely by the dispersion experienced by the pump light, phi ″f＝-φ″p/2＝-β2pLp/2，β2s、β2iSecond order dispersion coefficients of two sections of optical fiber, β respectively2pIs the second order dispersion coefficient of the pump light transmission fiber; l iss、LiRespectively the lengths of the front and rear sections of optical fibre, LpIs the length of fiber that the pump light undergoes dispersion broadening. When the second-order dispersion phi of the two optical fibers1、φ″2Focal length dispersion phi' with time lensfSatisfies the imaging conditionThen, the amplification or compression of the input optical signal can be realized, wherein the amplification factor M ═ phi ″ "2/φ″1。
Disclosure of Invention
In order to satisfy the demand of light computer to "stack" data structure when handling the problem such as compiling, system conversion, the utility model provides a realize "stack" system of light signal based on time lens imaging system makes the problem obtain solving.
In order to solve the technical problem the utility model discloses a technical scheme is:
a 'stack' system for realizing optical signals based on a time lens imaging system comprises an optical signal transmitting terminal part, a time lens imaging inversion subsection and an optical signal receiving terminal part, wherein the output end of the optical signal transmitting terminal part is connected with the input end of the time lens imaging inversion subsection, the output end of the time lens imaging inversion subsection is connected with the input end of the optical signal receiving end, and the optical signal transmitting terminal part is used for transmitting an input pulse sequence to the time lens imaging inversion subsection; in the time lens imaging inversion subsection, the inversion of the pulse signal is realized through the magnification factor of-1 times when M is equal to the magnification factor of-1 times; the optical signal receiving terminal part transmits the output pulse sequence to the next stage; after the signal passes through the system, the last-in first-out can be achieved, namely, the 'stack' of the optical signal is realized.
Further, the time lens imaging inversion subsection is composed of an input section of optical fiber and timeThe intermediate lens and the output section of the optical fiber; second-order dispersion phi of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging inversion subsection2/φ″1The whole signal light pulse sequence can be covered during the pump light pulse duration of the time lens imaging inversion subsection, and the inversion of the signal light pulse sequence is achieved by M-1, i.e. the conversion from "01010110" to "01101010" is achieved.
Still further, in the time lens imaging inversion subsection, a time lens effect is realized by FWM of signal light and pump light in a high nonlinear fiber.
Or the following steps: the time lens effect is realized by FWM of signal light and pump light in a highly nonlinear medium.
Preferably, the pump light pulse width is controlled so that one pump light pulse width can cover a signal light pulse sequence with a plurality of time lengths, thereby realizing the inversion of the signal.
The technical conception of the utility model is as follows: firstly, the optical signal transmitting terminal part transmits an input pulse sequence to a time lens imaging inversion subsection; in the time lens imaging inversion subsection, when ″ "2＝-φ″1Then, the amplification factor M is-1, so that the pulse width of the pump light can cover the whole signal light pulse width sequence, and the pulse sequence realizes time inversion after passing through a time lens imaging system, namely that '01010110' is converted into '01101010'; finally, the output sequence is transferred to the next stage through the optical signal receiving terminal section. In summary, after the entire system conversion, the input pulse sequence achieves inversion. Based on the inversion characteristic of the time lens imaging system and two subsections of the transmitting end and the receiving end of the optical signal, a simple, convenient and effective implementation scheme is provided for the 'stack' of the optical signal.
The beneficial effects of the utility model are embodied in: after the optical signal passes through the signal transmitting terminal part, the time lens imaging inversion subsection and the signal receiving terminal part, the 'stack' technology of the optical signal can be realized, and the advantages of the system are particularly reflected in solving the problems of compiling, binary conversion and the like in an optical computer.
Drawings
Fig. 1 is a system diagram of the present invention, which includes an optical signal transmitting terminal portion, a time lens imaging inversion subsection, and an optical signal receiving terminal portion.
Fig. 2 is a schematic diagram of time-lens inversion, where the optical pulse sequence obtains an inversion in time when the magnification M is-1.
Fig. 3 is a schematic diagram of inversion of an optical pulse train (01010110) with a pulse width of 1ps through a temporal lens imaging subsection, wherein (a) is the input signal (01010110); (b) is the output signal (01101010).
Detailed Description
The present invention will be further described with reference to the following embodiments, but the scope of the present invention is not limited thereto.
Referring to fig. 1-3, a "stack" system for implementing optical signals based on a time lens imaging system includes an optical signal transmitting terminal portion, a time lens imaging inversion subsection, and an optical signal receiving terminal portion; the output end of the optical signal transmitting terminal part is connected with the input end of the time lens imaging inversion subsection, the output end of the time lens imaging inversion subsection is connected with the input end of the optical signal receiving end, and the optical signal transmitting terminal part is used for transmitting an input pulse sequence to the time lens imaging inversion subsection; in the time lens imaging inversion subsection, the inversion of the pulse signal is realized through the magnification factor of-1 times when M is equal to the magnification factor of-1 times; the optical signal receiving terminal part transmits the output pulse sequence to the next stage; after the signal passes through the system, the last-in first-out can be achieved, namely, the 'stack' of the optical signal is realized.
The time lens imaging inversion subsection is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a When saidMagnification M ═ phi ″' of the inter-lens imaging subsections2/φ″1-1; controlling the width of the pump light pulse to make the duration of the pump light pulse cover the whole signal light pulse sequence, thereby ensuring that the light pulse sequence 01010110 can be inverted into 01101010; the optical signal receiving terminal part realizes the transmission of the output pulse sequence to the next stage.
In the time lens imaging inversion subsection, the time lens effect is realized by FWM of signal light and pump light in a high nonlinear optical fiber. Or the following steps: the time lens effect is realized by FWM of signal light and pump light in a highly nonlinear medium. Preferably, the pump light pulse width is controlled so that one pump light pulse width can cover a signal light pulse sequence with a plurality of time lengths, thereby realizing the inversion of the signal.
Referring to FIG. 2, to satisfy
The parameters of the time lens imaging inversion subsection are chosen as β2s＝20ps2/km，Ls＝1km，β2i＝-20ps2/km，Li＝1km，β2p＝20ps2/km，L p1 km. At this time, phi ″)2＝-φ″1，M＝-1。
FIG. 3 shows a pulse width T0The 1ps optical pulse train 01010110(a) is transformed into 01101010(b) after passing through the temporal lens imaging inversion subsection.
As shown in fig. 1 to fig. 3, after the signal 01010110 is transformed into 01101010, a "stack" operation is implemented. In the above embodiments, the optical pulse width is shortened, i.e., the signal processing rate is increased; the system has good performance, namely the system can be effectively used for processing the problems of compiling, binary conversion and the like in an optical computer, which need to use a 'stack' technology.
Claims (5)
1. A 'stack' system for realizing optical signals based on a time lens imaging system is characterized by comprising an optical signal transmitting terminal part, a time lens imaging inversion subsection and an optical signal receiving terminal part, wherein the output end of the optical signal transmitting terminal part is connected with the input end of the time lens imaging inversion subsection, the output end of the time lens imaging inversion subsection is connected with the input end of the optical signal receiving end, and the optical signal transmitting terminal part realizes the transmission of an input pulse sequence to the time lens imaging inversion subsection; in the time lens imaging inversion subsection, the inversion of the pulse signal is realized through the magnification factor of-1 times when M is equal to the magnification factor of-1 times; the optical signal receiving terminal part transmits the output pulse sequence to the next stage; after the signal passes through the system, the last-in first-out can be achieved, namely, the 'stack' of the optical signal is realized.
2. The "stack" system for realizing optical signals based on the time lens imaging system as claimed in claim 1, wherein the time lens imaging inversion sub-part is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi "of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2/φ″1The whole signal light pulse sequence can be covered during the pump light pulse duration of the time lens imaging subsystem by-1, and the inversion of the signal light pulse is realized by M-1, i.e. the conversion from "01010110" to "01101010" is realized.
3. A "stack" system for implementing optical signals based on a time-lens imaging system as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsection, the time lens effect is realized by FWM of signal light and pump light in a high nonlinear optical fiber.
4. A "stack" system for implementing optical signals based on a time-lens imaging system as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsection, the time lens effect is realized by FWM of signal light and pump light in a high nonlinear medium.
5. A "stack" system for implementing optical signals based on a time-lens imaging system as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsection, the width of the pump light pulse is controlled, so that one pump light pulse width can cover the whole signal light pulse sequence.
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