CN104243049A - All-optical OFDM receiving device - Google Patents
All-optical OFDM receiving device Download PDFInfo
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- CN104243049A CN104243049A CN201310243619.0A CN201310243619A CN104243049A CN 104243049 A CN104243049 A CN 104243049A CN 201310243619 A CN201310243619 A CN 201310243619A CN 104243049 A CN104243049 A CN 104243049A
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Abstract
The invention relates to the field of optical communication and discloses an all-optical OFDM receiving device. The device comprises an all-optical FFT module, wherein the all-optical FFT module comprises multiple basic units, a time sampling gate and a system clock circuit, and the basic units are Michelson interference devices. Each Michelson interference device comprises two adjusting arms, wherein one adjusting arm is adjustable in length and used for controlling time delay, the other adjusting arm is used for controlling phase shift, and fine adjustment of the refractive index of the other adjusting arm can be achieved. The system clock circuit controls the time sampling gate to filter a subcarrier signal modulated by the Michelson interference devices. The all-optical OFDM receiving device is based on the spatial free optical structure, demultiplexing modulation is conducted by means of the multiple Michelson interference devices, and expandability and flexibility are high; independent demultiplexing of any subcarrier signal contained in an OFDM signal can be achieved, other redundant demultiplexing channels are omitted, and power consumption of the device is effectively reduced.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of full light OFDM transmission/receptidevice device.
Background technology
The development pole the earth of the communication technology facilitates the progress of human society, from twentieth century second half so far, Fibre Optical Communication Technology is with unprecedented speed fast development.Along with the development of the Internet, various emerging network traffics business occurs like the mushrooms after rain, comprises web data, Email, online game, Online Video etc., and appearance and the growth of these business propose new demand to capacity of communication system.
OFDM is a kind of multi-transceiver technology, by carrying out serioparallel exchange process in system sending and receiving end to data, the high speed signal transmitted in single channel link is converted into the multi-path low speed sub-channel signal of parallel modulation, there is the features such as antijamming capability is strong, spectrum efficiency is high, dispersion tolerance is good.OFDM is widely used in wireless communication system, employing electronic device carries out inverse fast Fourier transform and fast Fourier transform realizes the multiplexing of signal and demultiplexing function, because the bottleneck of electronic chip limits, the modulation rate that electrical domain realizes OFDM cannot improve further, therefore, researcher proposes the thought realizing OFDM in full area of light.
The domestic and international research to full optical OFDM system at present makes certain gains.As adopted slab guide coupler structure to realize full light discrete Fourier transform and transform operation, but this apparatus structure is comparatively complicated and without expansion, realize difficulty to comprising when the more ofdm signal of number of sub carrier wave carries out multiplexing reconciliation multiplexing process.
Summary of the invention
The object of the invention is to propose a kind of full light OFDM transmission/receptidevice device based on space free optics, there is the features such as expansion is strong, flexibility is good.
For achieving the above object, the technical scheme that the present invention proposes is: a kind of full light OFDM transmission/receptidevice device, comprises full light FFT module; Described full light FFT module comprises multiple elementary cell, time sampling door and system clock circuit; Described elementary cell is Michelson interference device, and this Michelson interference device comprises two regulating arms, and the brachium of one of them regulating arm is adjustable, for delay of control amount; The refractive index of another regulating arm is fine-tuning, for controlling phase-shift phase; System clock circuit control time sampling gate carries out filtering to the sub-carrier signal through Michelson interference device modulates.
Further, described Michelson interference device input connects a circulator, and input light enters Michelson interference device through circulator, and after two regulating arms regulate, an optical interference circuit directly exports, and another optical interference circuit exports through circulator.
Further, when OFDM comprises N subcarriers signal, the number of described elementary cell is N-1, composition log
2n level series connection light path, at different levels in parallel 2
m-1individual Michelson interference device 1, wherein, m is 1 to log
2the integer of N; Described time sampling door number is N number of, respectively filtering sampling is carried out to each signal period of each sub-carrier signal, in the sampling time interval [(N-1) T/N, T] in each self-corresponding sub-carrier signal each signal period, T is each sub-carrier signal cycle.
Beneficial effect of the present invention is: based on the structure of space free optics, and adopt multiple Michelson interference device to carry out demultiplexing modulation, expansion is strong, flexibility good; Arbitrary sub-carrier signal that can realize being contained in ofdm signal carries out independent demultiplexing, cuts other unnecessary demultiplexing passages, effectively reduces the power consumption of device.
Accompanying drawing explanation
Fig. 1 is the present invention full light OFDM transmission/receptidevice device FFT modular structure schematic diagram;
Fig. 2 is FFT module base unit structural representation of the present invention;
Fig. 3 is the example structure schematic diagram that the present invention contains four sub-carrier signals;
Fig. 4 is that the present invention is only to the example structure schematic diagram of a subcarriers signal demultiplexing.
Reference numeral: 1, Michelson interference device; 101, regulating arm one; 102, regulating arm two; 103, semi-transparent semi-reflecting lens; 2, time sampling door.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Be illustrated in figure 1 the full light FFT module of the present invention's full light OFDM transmission/receptidevice device, this full light FFT module comprises multiple elementary cell, time sampling door 2 and system clock circuit.As shown in Figure 2, this elementary cell is Michelson interference device 1, and this Michelson interference device 1 comprises two regulating arms 101,102 and semi-transparent semi-reflecting lens 103, and what adopt in this embodiment is the function that a NPBS realizes semi-transparent semi-reflecting lens.The brachium of one of them regulating arm (as regulating arm 1) is adjustable, for delay of control amount; The refractive index of another regulating arm (as regulating arm 2 102) is fine-tuning, and for controlling phase-shift phase, each Michelson interference device 1 can realize the function of a 2-FFT computing, makes adjacent sub-carrier signal be able to export from different ports.This Michelson interference device 1 input connects a circulator, input light enters Michelson interference device 1 through circulator, after two regulating arms 101,102 regulate, an optical interference circuit directly exports, and another optical interference circuit exports through circulator, realizes the function of 1 × 2 port devices.System clock circuit control time sampling gate 2 carries out filtering to the sub-carrier signal modulated through Michelson interference device 1.
Concrete, as to comprising the integral number power that N(N is 2) ofdm signal of subcarriers signal carries out demultiplexing, and this receiving system need comprise N-1 Michelson interference device 1, forms 1 × N port devices, and N-1 Michelson interference device forms log
2n level series connection light path, at different levels in parallel 2
m-1individual Michelson interference device 1, wherein, m is 1 to log
2the integer of N.By each elementary cell in series connection at different levels, namely each Michelson interference device, is labeled as (m, k), i.e. a kth elementary cell in parallel in m level cascaded structure, k=1,2,3 ... 2
m-1.The in the end end joining day sampling gate 2 of one-level cascaded structure, the switching time of sampling gate is accurately controlled with the requirement of guarantee system to synchronism with system clock circuit, start-up time is (N-1) T/N of each signal period, duration is T/N, namely time sampling gate 2 number is N number of, respectively filtering sampling is carried out to each signal period of each sub-carrier signal, sampling time interval [(N-1) T/N in each self-corresponding sub-carrier signal each signal period, T], T is each sub-carrier signal cycle.This receiving system, by carrying out N-FFT calculating, realizes the demultiplexing function of N subcarriers signal.
Embodiment as shown in Figure 3, to comprise the full light OFDM transmission/receptidevice device of four sub-carrier signals, input ofdm signal x (t) is by four multiplexing acquisitions of sub-carrier signal, the modulation period of each sub-carrier signal is T, centre frequency is spaced apart 1/T, and the centre frequency of the 0th subcarrier is the integral multiple of 4/T.Multiplexing ofdm signal x (t) enters elementary cell (1,1) after (i.e. Michelson interference device 1), identical two bundle signals are divided into by semi-transparent semi-reflecting lens 103, wherein a branch of signal is introduced the time delay of T/2 by regulating arm 1, another bundle signal is introduced the phase shift of 0 by regulating arm 2 102, in this elementary cell (1,1) 2-FFT that namely output completes ofdm signal x (t) calculates, then enter in next stage cascaded structure, two beam splitting signals enter elementary cell (2 respectively, 1) and elementary cell (2,2).Wherein the delay volume of elementary cell (2,1) is T/4, and phase-shift phase is 0, exports sub-carrier signal X respectively
0and X
2; The delay volume of elementary cell (2,2) is T/4, and phase-shift phase is pi/2, exports sub-carrier signal X respectively
1and X
3.Finally, add a time sampling door 2 respectively at four output ports, the switching time of time sampling door 2 is controlled by system clock circuit, to ensure the synchronism requirement of system, [3T/4, T] that requirement is open at each symbol period in input signal x (t) is interval.The sub-carrier signal sequence that this structure finally exports is X
0, X
2, X
1, X
3, but not sort with natural number.
Embodiment as shown in Figure 4, only demultiplexing is carried out to a subcarriers signal, because the demultiplexing of each subcarriers signal does not all interdepend in whole process, when only needing in practical application to carry out demultiplexing to a certain subcarriers, choose the demultiplexing function that specific several elementary cell can realize corresponding subcarrier.As in Fig. 4, utilize elementary cell (1,1), (2,1) and (3,2) can complete sub-carrier X by series connection
2demultiplexing.This structure expansion is strong, flexibility good, effectively reduces the power consumption of device.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details to the various changes that the present invention makes, be protection scope of the present invention.
Claims (3)
1. a full light OFDM transmission/receptidevice device, comprises full light FFT module, it is characterized in that: described full light FFT module comprises multiple elementary cell, time sampling door and system clock circuit; Described elementary cell is Michelson interference device, and this Michelson interference device comprises two regulating arms, and the brachium of one of them regulating arm is adjustable, for delay of control amount; The refractive index of another regulating arm is fine-tuning, for controlling phase-shift phase; System clock circuit control time sampling gate carries out filtering to the sub-carrier signal through Michelson interference device modulates.
2. full light OFDM transmission/receptidevice device as claimed in claim 1, it is characterized in that: described Michelson interference device input connects a circulator, input light enters Michelson interference device through circulator, after two regulating arms regulate, an optical interference circuit directly exports, and another optical interference circuit exports through circulator.
3. full light OFDM transmission/receptidevice device as claimed in claim 1 or 2, it is characterized in that: when OFDM comprises N subcarriers signal, the number of described elementary cell is N-1, composition log
2n level series connection light path, at different levels in parallel 2
m-1individual Michelson interference device 1, wherein, m is 1 to log
2the integer of N; Described time sampling door number is N number of, respectively filtering sampling is carried out to each signal period of each sub-carrier signal, in the sampling time interval [(N-1) T/N, T] in each self-corresponding sub-carrier signal each signal period, T is each sub-carrier signal cycle.
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| CN201310243619.0A CN104243049A (en) | 2013-06-19 | 2013-06-19 | All-optical OFDM receiving device |
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| CN201310243619.0A CN104243049A (en) | 2013-06-19 | 2013-06-19 | All-optical OFDM receiving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696776A (en) * | 2018-04-12 | 2018-10-23 | 武汉邮电科学研究院有限公司 | Spatial light multiplexer and demultiplexer and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2068520A1 (en) * | 2007-12-07 | 2009-06-10 | Alcatel Lucent | Optical OFDM receiver channel monitor |
| CN102025682A (en) * | 2010-12-24 | 2011-04-20 | 北京邮电大学 | All-optical OFDM (orthogonal frequency division multiplexing) system transmitter device, OFDM system and method for processing signals |
-
2013
- 2013-06-19 CN CN201310243619.0A patent/CN104243049A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2068520A1 (en) * | 2007-12-07 | 2009-06-10 | Alcatel Lucent | Optical OFDM receiver channel monitor |
| CN102025682A (en) * | 2010-12-24 | 2011-04-20 | 北京邮电大学 | All-optical OFDM (orthogonal frequency division multiplexing) system transmitter device, OFDM system and method for processing signals |
Non-Patent Citations (1)
| Title |
|---|
| 张洪波等: ""基于光FFT的8*112Gbit/s全光OFDM光纤传输系统"", 《光电子 激光》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696776A (en) * | 2018-04-12 | 2018-10-23 | 武汉邮电科学研究院有限公司 | Spatial light multiplexer and demultiplexer and method |
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