CN103560828B - The light OFDM multichannel direct detection method of wavelength-division multiplex system and device - Google Patents
The light OFDM multichannel direct detection method of wavelength-division multiplex system and device Download PDFInfo
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Abstract
The invention discloses a kind of light OFDM multichannel direct detection method and device of wavelength-division multiplex system, relate to short distance optical transport and soft exchange field, the method comprises the following steps: suppose that channel spacing is λ-GHz, ofdm signal bandwidth is B, and in each passage, the protection of light ofdm signal and light carrier is spaced apart δ i, i is positive integer, represent channel number, satisfy condition: δ i=i*B, i=1,2,3...; In each passage, the protection interval θ i of light ofdm signal and adjacency channel light carrier satisfies condition: θ i >=δ i+B, i=1,2,3..., and θ i+ δ i+B=λ, i=1,2,3....The present invention utilizes the receiving equipment of a set of high bandwidth, and detect the light ofdm signal of multiple passage, system spectral efficiency is high simultaneously, and realizes simple, can reduce complexity and the cost of receiving terminal, improve the bandwidth availability ratio of receiving terminal device.
Description
Technical field
The present invention relates to short distance optical transport and soft exchange field, particularly relate to a kind of light OFDM(Orthogonal Frequency Division Multiplexing of wavelength-division multiplex system, OFDM) multichannel direct detecting method and device.
Background technology
Direct Inspection Technology is for relevant detection, and its system architecture is simple, device is ripe and cost is lower, therefore in sector application, still occupies comparatively great share.On the other hand, OFDM technology is widely used in wireless application, its advantage is that flexible spectrum is controlled, spectrum efficiency is high and can adopts DSP(Digital Signal Processing, Digital Signal Processing) technology overcomes the linear distortion produced in transmission.Therefore by above both combine the DDO-OFDM(Direct Detection Optical OFDM produced, Direct-detection Optical OFDM) technology is suggested first, just receives the extensive concern of industry.Owing to containing the technological merit of direct-detection and OFDM simultaneously, therefore DDO-OFDM has stronger competitiveness in multiple occasion, such as: in, short-range P2P(Point To Point, point-to-point) or P2MP(Point-to-MultiPoint, point-to-multipoint) between Large Copacity transmission.
DDO-OFDM technology refinement can be divided into single-side belt direct-detection and double-side band direct-detection two kinds, in single-side belt direct-detection system, receiving optical signals is made up of radio frequency light carrier and light ofdm signal two parts, after photodetector, carry out beat frequency between light carrier and light ofdm signal and obtain useful signal.Between the subcarrier of light ofdm signal, beat frequency obtains SSBI(Signal to Signal Beat Interference, the mutual beat frequency interference of inband signaling), the bandwidth of SSBI equals the signal bandwidth of OFDM.In order to not produce signal disturbing, useful signal must be radiofrequency signal, and the low-limit frequency of this radiofrequency signal must not lower than the signal bandwidth of OFDM.Frequency separation shared by SSBI is called protection interval by us.Shown in Figure 1, suppose that ofdm signal bandwidth is B, so protect interval must not be less than ofdm signal bandwidth B.Above situation, the bandwidth availability ratio of receiving terminal device is only 50%.
In wavelength-division multiplex system, adopt DDO-OFDM mode, generally first need each passage optical filter to extract, then corresponding a set of photoelectric detection equipment detects respectively, and the cost of such receiving terminal and complexity are all higher.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of light OFDM multichannel direct detection method and device of wavelength-division multiplex system are provided, utilize the receiving equipment of a set of high bandwidth, detect the light ofdm signal of multiple passage simultaneously, it realizes simple, complexity and the cost of receiving terminal can be reduced, improve the bandwidth availability ratio of receiving terminal device.
The invention provides a kind of light OFDM multichannel direct detection method of wavelength-division multiplex system, comprise the following steps:
Suppose that channel spacing is λ-GHz, ofdm signal bandwidth is B, and in each passage, the protection of light ofdm signal and light carrier is spaced apart δ i, and i is positive integer, represents channel number, meets the following conditions:
δi＝i*B，i＝1，2，3...；
Meanwhile, in each passage, the protection interval θ i of light ofdm signal and adjacency channel light carrier meets the following conditions:
θi≥δi+B，i＝1，2，3...；
And:
θi+δi+B＝λ，i＝1，2，3...。
On the basis of technique scheme, for 50GHz channel spacing, when described ofdm signal bandwidth B is 5GHz, interval between light carrier in 4 adjacency channels and signal is set gradually as 5GHz, 10GHz, 15GHz and 20GHz, receiving terminal only needs the photoelectric detection equipment of a set of 25GHz, detect the ofdm signal in above 4 passages simultaneously, the bandwidth availability ratio of device is 80%, here there is the beat frequency possibility of two kinds of forms: a, beat frequency in the band that in passage, beat frequency obtains useful signal and signal, do not superpose each other between the useful signal of each passage, but beat frequency is all superimposed upon on same protection interval in the signal band of each passage, b, interchannel beat frequency, that is: the signal in passage and beat frequency between the light carrier of adjacency channel, this part signal frequency range produced is greater than the peak frequency of OFDM radiofrequency signal, can not superpose with useful signal.
The present invention is also provided for the light OFDM multichannel direct checkout gear of the wavelength-division multiplex system realizing said method, comprise some single-side belt light ofdm signal generating apparatus, an array waveguide grating and a photodetector, each passage is all containing a single-side belt light ofdm signal generating apparatus, each single-side belt light ofdm signal generating apparatus comprises light source, intensity modulator, radio frequency clock source, optical branching filter, I/Q modulator, first band pass filter, second band pass filter and optical multiplexer, light source generates a road light carrier through intensity modulator, this road light carrier comprises wavelength and is respectively λ 1, the light carrier of λ 2, Δ f is spaced apart between light carrier λ 1 and light carrier λ 2, the radio frequency clock source that intensity modulator is Δ f/2 by frequency drives, this road light carrier is divided into the identical signal of two-way by optical branching filter, every road signal all comprises light carrier λ 1 and light carrier λ 2, Δ f is spaced apart between light carrier λ 1 and light carrier λ 2, wherein, one road signal after I/Q modulator by the first band-pass filter, another road signal is directly by the second band-pass filter, and the centre frequency of the first band pass filter and the second band pass filter corresponds respectively to two carrier frequency points of light carrier λ 1 and λ 2, two-way after filtering after signal close ripple by optical multiplexer, final form single-side belt light ofdm signal, the single-side belt light ofdm signal that each passage generates closes after ripple through array waveguide grating and is sent to receiving terminal, and receiving terminal only needs single photodetector, receives above multi channel signals simultaneously.
Compared with prior art, advantage of the present invention is as follows:
The present invention utilizes the receiving equipment of a set of high bandwidth, and detect the light signal of multiple passage, system spectral efficiency is high simultaneously, and realize simple, for traditional DDO-OFDM system, the present invention can reduce complexity and the cost of receiving terminal, improves the bandwidth availability ratio of receiving terminal device.
Accompanying drawing explanation
Fig. 1 is the signal formation schematic diagram that single-side belt light ofdm signal carries out direct-detection.
Fig. 2 is the schematic diagram of the transmitting terminal signal spectrum being applicable to wavelength-division multiplex system in the embodiment of the present invention.
Fig. 3 is the structured flowchart of the light OFDM multichannel direct checkout gear of wavelength-division multiplex system in the embodiment of the present invention.
Fig. 4 is the structured flowchart of single-side belt light ofdm signal generating apparatus in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
The embodiment of the present invention provides a kind of light OFDM multichannel direct detection method of wavelength-division multiplex system, comprises the following steps:
Suppose that channel spacing is λ-GHz, ofdm signal bandwidth is B, and in each passage, the protection of light ofdm signal and light carrier is spaced apart δ i, and i is positive integer, represents channel number, meets the following conditions:
δi＝i*B，i＝1，2，3...
Meanwhile, in each passage, the protection interval θ i of light ofdm signal and adjacency channel light carrier meets the following conditions:
θi≥δi+B，i＝1，2，3...
And:
θi+δi+B＝λ，i＝1，2，3...。
Be described for the wavelength-division multiplex system of 50GHz passage compartment below.
Shown in Figure 2, for 50GHz channel spacing, suppose that ofdm signal bandwidth B is 5GHz, interval between light carrier in 4 adjacency channels and signal is set gradually as 5GHz, 10GHz, 15GHz and 20GHz, so only need the photoelectric detection equipment of a set of 25GHz at receiving terminal, just can detect the ofdm signal in above 4 passages simultaneously.In this case, the bandwidth availability ratio of device is 80%.Here exist two kinds of forms beat frequency may: beat frequency in the band that in a, passage, beat frequency can obtain useful signal and signal, can not superpose each other, but in the signal band of each passage, beat frequency is all superimposed upon on same protection interval between the useful signal of each passage; B, interchannel beat frequency, that is: the signal in passage and beat frequency between the light carrier of adjacency channel, this part signal frequency range produced is greater than the peak frequency of OFDM radiofrequency signal, therefore can not superpose with useful signal.
Shown in Figure 3, the embodiment of the present invention also provides a kind of light OFDM multichannel direct checkout gear of the wavelength-division multiplex system for realizing said method, comprise some single-side belt light ofdm signal generating apparatus, an array waveguide grating and a photodetector, each passage is all containing a single-side belt light ofdm signal generating apparatus, shown in Figure 4, each single-side belt light ofdm signal generating apparatus comprises light source, intensity modulator, radio frequency clock source, optical branching filter, I/Q modulator, first band pass filter, second band pass filter and optical multiplexer, light source generates a road light carrier through intensity modulator, this road light carrier comprises wavelength and is respectively λ 1, the light carrier of λ 2, Δ f is spaced apart between light carrier λ 1 and light carrier λ 2, the radio frequency clock source that intensity modulator is Δ f/2 by frequency drives, this road light carrier is divided into the identical signal of two-way by optical branching filter, every road signal all comprises light carrier λ 1 and light carrier λ 2, Δ f is spaced apart between light carrier λ 1 and light carrier λ 2, wherein, one road signal after I/Q modulator by the first band-pass filter, another road signal is directly by the second band-pass filter, and the centre frequency of the first band pass filter and the second band pass filter corresponds respectively to two carrier frequency points of light carrier λ 1 and λ 2, two-way after filtering after signal close ripple by optical multiplexer, final form single-side belt light ofdm signal, the single-side belt light ofdm signal that each passage generates closes after ripple through array waveguide grating and is sent to receiving terminal, and receiving terminal only needs single photodetector can receive above multi channel signals simultaneously.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in specification is known to the skilled person.
Claims (2)
1. a light OFDM multichannel direct detection method for wavelength-division multiplex system, is characterized in that, comprise the following steps:
Suppose that channel spacing is λ-GHz, ofdm signal bandwidth is B, and in each passage, the protection of light ofdm signal and light carrier is spaced apart δ i, and i is positive integer, represents channel number, meets the following conditions:
δ
i＝i*B，i＝1，2，3，...；
Meanwhile, in each passage, the protection interval θ i of light ofdm signal and adjacency channel light carrier meets the following conditions:
θi≥δi+B，i＝1，2，3...；
And:
θi+δi+B＝λ，i＝1，2，3...；
For 50GHz channel spacing, when described ofdm signal bandwidth B is 5GHz, interval between light carrier in 4 adjacency channels and signal is set gradually as 5GHz, 10GHz, 15GHz and 20GHz, receiving terminal only needs the photoelectric detection equipment of a set of 25GHz, detect the ofdm signal in above 4 passages simultaneously, the bandwidth availability ratio of device is 80%, here there is the beat frequency possibility of two kinds of forms: a, beat frequency in the band that in passage, beat frequency obtains useful signal and signal, do not superpose each other between the useful signal of each passage, but beat frequency is all superimposed upon on same protection interval in the signal band of each passage, b, interchannel beat frequency, that is: the signal in passage and beat frequency between the light carrier of adjacency channel, this part signal frequency range produced is greater than the peak frequency of OFDM radiofrequency signal, can not superpose with useful signal.
2. for realizing the light OFDM multichannel direct checkout gear of the wavelength-division multiplex system of method described in claim 1, it is characterized in that: comprise some single-side belt light ofdm signal generating apparatus, an array waveguide grating and a photodetector, each passage is all containing a single-side belt light ofdm signal generating apparatus, each single-side belt light ofdm signal generating apparatus comprises light source, intensity modulator, radio frequency clock source, optical branching filter, I/Q modulator, first band pass filter, second band pass filter and optical multiplexer, light source generates a road light carrier through intensity modulator, this road light carrier comprises wavelength and is respectively λ 1, the light carrier of λ 2, Δ f is spaced apart between light carrier λ 1 and light carrier λ 2, the radio frequency clock source that intensity modulator is Δ f/2 by frequency drives, this road light carrier is divided into the identical signal of two-way by optical branching filter, every road signal all comprises light carrier λ 1 and light carrier λ 2, wherein, one road signal after I/Q modulator by the first band-pass filter, another road signal is directly by the second band-pass filter, and the centre frequency of the first band pass filter and the second band pass filter corresponds respectively to two carrier frequency points of light carrier λ 1 and λ 2, two-way after filtering after signal close ripple by optical multiplexer, final form single-side belt light ofdm signal, the single-side belt light ofdm signal that each passage generates closes after ripple through array waveguide grating and is sent to receiving terminal, and receiving terminal only needs single photodetector, receives above multi channel signals simultaneously.
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| CN104283609B (en) * | 2014-10-27 | 2016-08-24 | 武汉邮电科学研究院 | Direct detecting method based on dual pathways orthogonal guide frequency optical signal, system and device |
| CN106160848B (en) * | 2015-03-24 | 2020-06-26 | 中兴通讯股份有限公司 | Error code testing method, device and system for multi-channel system |
| CN105049124B (en) * | 2015-07-30 | 2018-08-21 | 电子科技大学 | Double hairs suitable for DDO-OFDM are the same as collecting/transmitting system and its transmitting terminal |
| CN108680578B (en) * | 2018-03-14 | 2020-08-04 | 西安工业大学 | Multi-spectral frequency division multiplexing detection system and method |
| CN113162724A (en) * | 2020-01-23 | 2021-07-23 | 中国移动通信有限公司研究院 | Optical signal transmission method, device and equipment |
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