CN103546417B - Optical OFDM signal direct detection method and device for polarized orthogonality - Google Patents
Optical OFDM signal direct detection method and device for polarized orthogonality Download PDFInfo
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- CN103546417B CN103546417B CN201310553002.9A CN201310553002A CN103546417B CN 103546417 B CN103546417 B CN 103546417B CN 201310553002 A CN201310553002 A CN 201310553002A CN 103546417 B CN103546417 B CN 103546417B
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Abstract
The invention discloses an optical OFDM signal direct detection method and device for polarized orthogonality, and relates to the field of optical transmission and optical access. The optical OFDM direct detection method includes the steps that in a frequency band multiplexing system, a 45-degree polarization state is adopted in optical carriers of optical OFDM signal frequency bands to enable the polarization states of the adjacent frequency bands to be orthogonal, and two forms of beat frequency possibilities exist, wherein the first beat frequency possibility is that in-band beat frequencies of the signals are overlapped to the same guard interval, and the second beat frequency possibility is that two polarized optical signals respectively carry out beat frequency operation with the polarized optical carriers corresponding to the polarized optical signals to obtain effective signals; the optical OFDM direct detection method can be expanded to be double-sideband detection, the optical OFDM signal frequency band is also added to the other side of each optical carrier, and the bandwidth utilization rate of the device reaches 80%. By using of a set of high-bandwidth receiving device, the optical OFDM signals of a plurality of polarized orthogonal frequency bands can be detected at the same time, and the system spectrum efficiency is high; the optical OFDM direct detection method is easy to achieve and can reduce complex degree and cost of a receiving end, and the bandwidth utilization rate of the device at the receiving end reaches 80%.
Description
Technical field
The present invention relates to optical transport and soft exchange field, particularly relate to the light of a kind of polarized orthogonal
OFDM (Orthogonal Frequency Division Multiplexing, OFDM)
Signal 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 relatively low, in sector application, therefore still occupy larger share.On the other hand, OFDM
Technology is widely used in wireless application, and its advantage is that frequency spectrum is the most controlled, spectrum efficiency
High and DSP (Digital Signal Processing, Digital Signal Processing) skill can be used
Art overcomes produced linear distortion in transmission.Therefore, produced by both combining
DDO-OFDM (Direct Detection Optical OFDM, Direct-detection Optical orthogonal frequency
Multiplexing) technology is suggested first, just receives the extensive concern of industry.Owing to containing simultaneously
Directly detection and the technological merit of OFDM, therefore DDO-OFDM is in multiple occasion
Have stronger competitiveness, such as: in, (Point To Point, it is right to put for short-range P2P
Point) or P2MP (Point-to-MultiPoint, point-to-multipoint) between high capacity transmission.
DDO-OFDM technology can refine and be divided into single-side belt directly to detect directly examining with double-side band
Survey two kinds, in the direct detecting system of single-side belt, receive optical signals radio frequency light carrier and light
Ofdm signal two parts form, after photodetector, and light carrier and light OFDM
Carry out beat frequency between signal and obtain useful signal.Beat frequency between the subcarrier of light ofdm signal
Obtain SSBI (Signal to Signal Beat Interference, the mutual beat frequency of inband signaling disturbs),
The bandwidth of the SSBI signal bandwidth equal to OFDM.In order to not produce signal disturbing, effectively believe
Number must be radiofrequency signal, and the low-limit frequency of this radiofrequency signal must not be less than OFDM's
Signal bandwidth.Frequency separation shared by SSBI is called protection interval by us.For multifrequency
For band system, protection interval is determined by number of frequency bands and band bandwidth.It is shown in Figure 1,
Assuming that ofdm signal number of frequency bands is N, band bandwidth is B, then protection interval must not
Less than ofdm signal bandwidth N*B.Case above, the bandwidth availability ratio of receiving terminal device is only
It is 50%.
DDO-OFDM mode is used, typically firstly the need of by each in wavelength-division multiplex system
Passage optical filter extracts, and the most corresponding a set of photoelectric detection equipment is examined
Surveying, the cost of such receiving terminal is the highest with complexity.
Summary of the invention
The invention aims to overcome the deficiency of above-mentioned background technology, it is provided that a kind of polarization
Orthogonal light ofdm signal direct detecting method and device, utilize the reception of a set of high bandwidth
Equipment, detects the light ofdm signal of multiple polarized orthogonal frequency band, system spectral efficiency simultaneously
Height, and realize simple, complexity and the cost of receiving terminal, the bandwidth of receiving terminal device can be reduced
Utilization rate reaches 80%.
The present invention provides the light ofdm signal direct detecting method of a kind of polarized orthogonal, including
Following steps: in frequency band multiplex system, the light carrier of light ofdm signal frequency band uses 45
Degree polarization state, the polarization state making nearby frequency bands is orthogonal, and two orthogonal polarisation state have identical intensity,
Here in there is the band of the beat frequency possibility of two kinds of forms: a, signal, beat frequency is all added to same
On protection interval；B, the light carrier of two the most corresponding polarization states of optical signal polarized enter
Row beat frequency, obtains useful signal；Above method is expanded to double-side band detection: at light carrier
Another side also adds above-mentioned smooth ofdm signal frequency band, and bandwidth of a device utilization rate reaches 80%.
The light ofdm signal that the present invention also provides for the polarized orthogonal for realizing said method is straight
Connect detection device, including light source, intensity modulator, radio frequency clock source, optical branching filter, polarization
Beam splitter, the first band filter, the first I/Q modulator, the second band filter, second
I/Q modulator, the first optical multiplexer, the 3rd band filter and the second optical multiplexer, light source
Generating a road light carrier by intensity modulator, it is Δ f's that this road light carrier comprises frequency interval
First light carrier λ the 1, second light carrier λ the 2, the 3rd light carrier λ 3, intensity modulator is by frequency
Radio frequency clock source for Δ f drives, and this road light carrier is divided into, by optical branching filter, the letter that two-way is identical
Number, every road signal all comprise first light carrier λ the 1, second light carrier λ 2 that frequency interval is Δ f,
3rd light carrier λ 3, first the road light carrier that optical branching filter separates is sent to polarization beam apparatus,
Polarization beam apparatus is divided into two orthogonal polarization states, the most respectively to X polarization state and Y
The two-way optical carrier component of polarization state is filtered: first via optical carrier component is logical by the first band
Wave filter, the first band filter selects the first light carrier λ 1, is sent to the first I/Q modulator and enters
The ofdm signal modulation of row X polarization, obtains X and polarizes ofdm signal；Second road light
Carrier component passes through the second band filter, and the second band filter selects the second light carrier λ 2,
It is sent to the second I/Q modulator and carries out the ofdm signal modulation of Y polarization, obtain Y polarization
Ofdm signal；X polarization ofdm signal is photosynthetic through first with Y polarization ofdm signal
Ripple device closes ripple, forms the double frequency-band OFDM optical signal of polarized orthogonal；Optical branching filter separates
Another road light carrier selects the 3rd light carrier through the 3rd band filter, the 3rd band filter
λ 3, the 3rd light carrier λ 3 is finally by the double frequency-band of the second optical multiplexer Yu polarized orthogonal
OFDM optical signal carries out closing ripple, forms the double frequency-band single-side belt ofdm signal of polarized orthogonal.
Compared with prior art, advantages of the present invention is as follows:
The present invention utilizes the reception equipment of a set of high bandwidth, detects the light letter of multiple frequency band simultaneously
Number, system spectral efficiency is high, and realizes simple, relative to tradition DDO-OFDM system
Speech, the present invention can reduce complexity and the cost of receiving terminal, the bandwidth usage of receiving terminal device
Rate reaches 80%.
Accompanying drawing explanation
Fig. 1 is that the signal that single-side belt light ofdm signal directly detects constitutes schematic diagram.
Fig. 2 is frequency band multiplex system transmitting terminal orthogonal based on polarization state in the embodiment of the present invention
The schematic diagram of signal spectrum.
Fig. 3 is that the light ofdm signal of polarized orthogonal in the embodiment of the present invention directly detects device
Structured flowchart.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 2, the embodiment of the present invention provides the light OFDM letter of a kind of polarized orthogonal
Number direct detecting method, comprises the following steps:
In frequency band multiplex system, the light carrier of light ofdm signal frequency band uses 45 degree of polarizations
State, the polarization state making nearby frequency bands is orthogonal, and two orthogonal polarisation state have identical intensity, here
Exist two kinds of forms beat frequency may: a, signal band in beat frequency be all added to same protection
On interval；B, the light carrier of two the most corresponding polarization states of optical signal polarized are clapped
Frequently, useful signal is obtained.Owing to the polarization state of nearby frequency bands is orthogonal, therefore between them
Cannot produce mutual beat frequency, bandwidth of a device utilization rate in this case is 66%, and above method can
To expand to double-side band detection, it may be assumed that the another side at light carrier also adds the light of similar structures
Ofdm signal frequency band, in the case of being somebody's turn to do, bandwidth of a device utilization rate reaches 80%.
Shown in Figure 3, the embodiment of the present invention also provides for a kind of for realizing the inclined of said method
The light ofdm signal shaking orthogonal directly detects device, including light source, intensity modulator, penetrates
Frequently clock source, optical branching filter, polarization beam apparatus, the first band filter, an IQ modulation
Device, the second band filter, the second I/Q modulator, the first optical multiplexer, the 3rd logical filter of band
Ripple device and the second optical multiplexer, first, light source generates a road light carrier by intensity modulator,
This road light carrier comprise first light carrier λ the 1, second light carrier λ 2 that frequency interval is Δ f,
Three light carrier λ 3, intensity modulator is driven by the radio frequency clock source that frequency is Δ f, and this road light carries
Ripple is divided into, by optical branching filter, the signal that two-way is identical, and it is Δ f that every road signal all comprises frequency interval
First light carrier λ the 1, second light carrier λ the 2, the 3rd light carrier λ 3, optical branching filter separates
First one road light carrier is sent to polarization beam apparatus, polarization beam apparatus be divided into two orthogonal inclined
Polarization state, is filtered the two-way optical carrier component of X polarization state and Y polarization state the most respectively:
First via optical carrier component passes through the first band filter, and the first band filter selects the first light
Carrier wave λ 1, is sent to the first I/Q modulator and carries out the ofdm signal modulation of X polarization, obtain
X polarizes ofdm signal；Second road optical carrier component pass through the second band filter, second
Band filter selects the second light carrier λ 2, is sent to the second I/Q modulator and carries out Y polarization
Ofdm signal is modulated, and obtains Y and polarizes ofdm signal；X polarization ofdm signal and Y
Polarization ofdm signal closes ripple through the first optical multiplexer, forms the double frequency-band of polarized orthogonal
OFDM optical signal；Another road light carrier that optical branching filter separates through the 3rd band filter,
3rd band filter selects the 3rd light carrier λ 3, and the 3rd light carrier λ 3 is finally by the second light
Wave multiplexer carries out closing ripple with the double frequency-band OFDM optical signal of polarized orthogonal, forms polarized orthogonal
Double frequency-band single-side belt ofdm signal.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if
If these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then
These amendments and modification are also within protection scope of the present invention.
The prior art that the content not described in detail in description is known to the skilled person.
Claims (2)
1. the light ofdm signal direct detecting method of a polarized orthogonal, it is characterised in that
Comprise the following steps:
In frequency band multiplex system, the light carrier of light ofdm signal frequency band uses 45 degree of polarizations
State, the polarization state making nearby frequency bands is orthogonal, and two orthogonal polarisation state have identical intensity, here
In there is the band of the beat frequency possibility of two kinds of forms: a, light ofdm signal, beat frequency is all added to same
On one protection interval；B, the light ofdm signal corresponding polarization state respectively of two polarizations
Light carrier carry out beat frequency, obtain useful signal；Above step expands to double-side band detect:
Another side at light carrier also adds above-mentioned smooth ofdm signal frequency band, bandwidth of a device utilization rate
Reach 80%.
2. the light ofdm signal of the polarized orthogonal for realizing method described in claim 1 is straight
Connect detection device, it is characterised in that: include light source, intensity modulator, radio frequency clock source, light
Channel-splitting filter, polarization beam apparatus, the first band filter, the first I/Q modulator, the second band are logical
Wave filter, the second I/Q modulator, the first optical multiplexer, the 3rd band filter and the second light
Wave multiplexer, light source generates a road light carrier by intensity modulator, and this road light carrier comprises frequency
Being spaced apart first light carrier λ the 1, second light carrier λ the 2, the 3rd light carrier λ 3 of Δ f, intensity is adjusted
Device processed is driven by the radio frequency clock source that frequency is Δ f, and this road light carrier is divided into two by optical branching filter
The signal that road is identical, every road signal all comprise the first light carrier λ 1 that frequency interval is Δ f,
Two light carrier λ the 2, the 3rd light carrier λ 3, first the road light carrier that optical branching filter separates is sent to
Polarization beam apparatus, polarization beam apparatus is divided into two orthogonal polarization states, the most respectively to X
The two-way optical carrier component of polarization state and Y polarization state is filtered: first via optical carrier component
By the first band filter, the first band filter selects the first light carrier λ 1, is sent to
One I/Q modulator carries out the ofdm signal modulation of X polarization, obtains X polarization OFDM letter
Number；Second road optical carrier component passes through the second band filter, and the second band filter selects the
Two light carrier λ 2, are sent to the second I/Q modulator and carry out the ofdm signal modulation of Y polarization,
Obtain Y and polarize ofdm signal；X polarization ofdm signal polarizes ofdm signal with Y
Close ripple through the first optical multiplexer, form the double frequency-band OFDM optical signal of polarized orthogonal；Light
Another road light carrier that channel-splitting filter separates is through the 3rd band filter, the 3rd band filter choosing
Selecting the 3rd light carrier λ 3, the 3rd light carrier λ 3 is finally by the second optical multiplexer and polarized orthogonal
Double frequency-band OFDM optical signal carry out close ripple, formed polarized orthogonal double frequency-band single-side belt
Ofdm signal.
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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 |
| CN105490749A (en) * | 2015-12-14 | 2016-04-13 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN105635023B (en) * | 2016-01-06 | 2019-03-01 | 北京邮电大学 | For the method for transmitting signals of beat frequency AF panel, equipment and system between signal |
| CN108614278B (en) * | 2018-05-04 | 2020-03-03 | 南京航空航天大学 | Atmospheric laser remote sensing method based on polarization modulation and polarization laser radar |
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| CN102255664A (en) * | 2011-04-18 | 2011-11-23 | 武汉邮电科学研究院 | Polarization multiplexing communication method and system based on time interleaving return to zero code |
| CN102427386A (en) * | 2011-09-19 | 2012-04-25 | 武汉邮电科学研究院 | Polarization shift keying demodulation method and system |
| WO2012139165A2 (en) * | 2011-04-14 | 2012-10-18 | Monash University | Joint coding for optical ofdm |
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| CN102742187B (en) * | 2009-12-15 | 2018-03-16 | 骁阳网络有限公司 | The method and apparatus that optical transmission signal is transmitted in the case of the Polarization Dependent Loss of reduction |
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|---|---|---|---|---|
| WO2012139165A2 (en) * | 2011-04-14 | 2012-10-18 | Monash University | Joint coding for optical ofdm |
| CN102255664A (en) * | 2011-04-18 | 2011-11-23 | 武汉邮电科学研究院 | Polarization multiplexing communication method and system based on time interleaving return to zero code |
| CN102427386A (en) * | 2011-09-19 | 2012-04-25 | 武汉邮电科学研究院 | Polarization shift keying demodulation method and system |
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| Title |
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| 直接检测光OFDM相位特性分析;梁猛;《光通信研究》;20111231(第2期);全文 * |
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