CN205490653U - Light OFDM intensity modulation direct detection communication device - Google Patents
Light OFDM intensity modulation direct detection communication device Download PDFInfo
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- CN205490653U CN205490653U CN201620233756.5U CN201620233756U CN205490653U CN 205490653 U CN205490653 U CN 205490653U CN 201620233756 U CN201620233756 U CN 201620233756U CN 205490653 U CN205490653 U CN 205490653U
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- ofdm
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- intensity
- amplifier
- communicator
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Abstract
The utility model provides a light OFDM intensity modulation direct detection communication device, including the OFDM signalling machine based on the HCSLM technique that connects gradually, arbitrary signal waveform generator, intensity modulator, optic fibre and photoelectric detector, intensity modulator receives outside light carrier signal, the OFDM signalling machine generates the OFDM signal based on the HCSLM technique, can obtain the lower OFDM signal of PAPR, arbitrary signal waveform generator carries out waveform processing to the lower OFDM signal of PAPR and exports intensity modulator to, intensity modulator handles outside light carrier signal and the lower OFDM wave form signal of PAPR and transmits to optic fibre, optic fibre output signal is to photoelectric detector, photoelectric detector realizes photoelectric conversion, the output signal of telecommunication, the staff can carry out further experiment to the signal of telecommunication of photoelectric detector output, in order to realize the research to the less OFDM signal of PAPR.
Description
Technical field
This utility model relates to technical field of photo communication, particularly relates to light OFDM (Orthogonal
Frequency Division Multiplexing, orthogonal frequency division multiplexi) intensity modulated directly detects communication dress
Put.
Background technology
In a communications system, the bandwidth that channel can be provided by is generally wide than the bandwidth needed for transmitting a road signal
Much.If a channel only transmits a road signal waste very much, in order to make full use of channel
Bandwidth, it is possible to the method using frequency division multiplexing.OFDM main thought is: break a channel into some orthogonal
Subchannel, is converted into parallel low speed sub data flow by high-speed data signal, and modulation is on each of the sub-channels
It is transmitted.Orthogonal signalling so can reduce son by using correlation technique to come separately at receiving terminal
(ISI) is interfered between channel.Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, because of
Flatness decline can be regarded as, such that it is able to eliminate intersymbol interference, and due to each on this every sub-channels
The bandwidth of subchannel is only the sub-fraction of former channel width, and channel equalization becomes relatively easy.
In SLM (Selective Mapping, selected mapping method) technology, for demodulating data, a lot of sidebands
Information needs subsidiary transmission, therefore, inevitably brings the shortcoming that data transmission efficiency is low.In order to drop
The impact of low fiber nonlinear effect, need use PAPR (PAPR-Peak to Average Power Ratio,
Papr) less ofdm signal, i.e. it is necessary that the ofdm signal to PAPR is less enters
Row research further.But at present, owing to signal is at IFFT (Inverse Fast Fourier in tradition SLM
Transform inverse fast Fourier transform) before, separate phase rotation coefficient is to pass through m-sequence
Controlling to produce, the chance choosing the ofdm signal with less PAPR is less.So cause comparison difficult right
Ofdm signal less for PAPR is further tested.
Utility model content
Based on this, it is necessary to the ofdm signal that PAPR is less can be tested for there is no at present
Problem, it is provided that a kind of light OFDM intensity modulated ofdm signal that PAPR is less can tested
Directly detect communicator.
A kind of light OFDM intensity modulated directly detects communicator, including be sequentially connected with based on HCSLM
(combining hyperchaos with selected mapping, super hyperchaos combines with selected mapping method)
The ofdm signal transmitter of technology, arbitrary signal waveform generator, intensity modulator, optical fiber and photoelectricity
Detector, intensity modulator receives exterior light carrier signal.
This utility model OFDM intensity modulated directly detects communicator, including be sequentially connected with based on
The ofdm signal transmitter of HCSLM technology, arbitrary signal waveform generator, intensity modulator, optical fiber
And photoelectric detector, intensity modulator receive exterior light carrier signal, ofdm signal transmitter based on
HCSLM technology generates ofdm signal, can obtain the relatively low ofdm signal of PAPR, arbitrary signal
Waveform generator carries out waveform processing and exports to intensity modulator, intensity ofdm signal relatively low for PAPR
OFDM waveshape signal relatively low to exterior light carrier signal and PAPR is carried out process by manipulator to be transmitted to optical fiber,
Optical output signal is to photoelectric detector, and photoelectric detector realizes opto-electronic conversion, exports the signal of telecommunication, and work people
The signal of telecommunication of photoelectric detector output can be tested by member further, less to PAPR to realize
The research of ofdm signal.
Accompanying drawing explanation
Fig. 1 is the structure that this utility model OFDM intensity modulated directly detects first embodiment of communicator
Schematic diagram；
Fig. 2 is the structure that this utility model OFDM intensity modulated directly detects second embodiment of communicator
Schematic diagram.
Detailed description of the invention
HCSLM technology is the SLM technology incorporating hyperchaotic system.Owing to hyperchaotic system has very well
Class stochastic behaviour, as to initial condition sensitivity, aperiodicity, noise like, determine system produce the most true
Determining behavior, repeatable generation, it has been used for secret signalling.It is in fact possible to by hyperchaos and
SLM technology organically combines: uses hyperchaos digitized means to produce rotatable sequence, can revolve as phase place
Transposon is in the SLM technology reducing PAPR.If using hyperchaos and SLM technology to reduce OFDM
PAPR, owing to there is the most separate and phase rotation coefficient of function admirable, can have more
Chance selects the ofdm signal with less PAPR.Identical hyperchaotic system is used at transmitting-receiving two-end
Under the conditions of, only initial condition needs to transmit together with data as incidental information, greatly increases effectively
The transfer rate of data.
As it is shown in figure 1, a kind of light OFDM intensity modulated directly detects communicator, including be sequentially connected with
Ofdm signal transmitter 100 based on HCSLM technology, arbitrary signal waveform generator 200, intensity are adjusted
Device 300 processed, optical fiber 400 and photoelectric detector 420, intensity modulator 300 receives exterior light carrier signal.
Ofdm signal transmitter 100 based on HCSLM technology is for generating the less OFDM of PAPR
Signal.Specifically, ofdm signal transmitter 100 based on HCSLM technology can use hyperchaos
Signal controls the twiddle factor in SLM technology, obtains the relatively low ofdm signal of PAPR, specifically,
This technology can be used to produce the ofdm signal of 3.28Gbit/s.Arbitrary signal waveform generator 200 is used for
The ofdm signal that HCSLM technology produces is converted to the electrical modulation signal of simulation.Intensity modulator 300
By mach zhender single armed manipulator, by electric drive signal and its direct current biasing of regulation manipulator, make
Its output is with the intensitymodulated optical signals of baseband signal change.Optical fiber 400, for propagating optical signal, specifically comes
Saying, optical fiber 400 can select SSMF-28 single-mode fiber.Photoelectric detector 420 is for realizing the light of signal
The conversion of → electricity.
This utility model OFDM intensity modulated directly detects communicator, including be sequentially connected with based on
The ofdm signal transmitter 100 of HCSLM technology, arbitrary signal waveform generator 200, intensity modulator
300, optical fiber 400 and photoelectric detector 420, intensity modulator 300 receives exterior light carrier signal, OFDM
Signal transmitter generates ofdm signal based on HCSLM technology, can obtain the relatively low OFDM of PAPR
Signal, arbitrary signal waveform generator 200 carries out waveform processing output to ofdm signal relatively low for PAPR
To intensity modulator 300, intensity modulator 300 is by OFDM relatively low to exterior light carrier signal and PAPR
Waveshape signal transmits after carrying out carrier processing to optical fiber 400, and optical fiber 400 outputs signal to photoelectric detector 420,
Photoelectric detector 420 realizes opto-electronic conversion, exports the signal of telecommunication, and staff can be to photoelectric detector 420
The signal of telecommunication of output is tested further, to realize the research of the ofdm signal less to PAPR.
As in figure 2 it is shown, wherein in an embodiment, light OFDM intensity modulated directly detects communicator
Also including optical carrier generation module 500, optical carrier generation module 500 is with intensity modulator 300 even
Connect.
Optical carrier generation module 500 is used for generating optical carrier.Specifically, the light carrier of generation
Centered by signal wavelength be 1542.46nm, power be the continuous light wave of 14.5dBm.
As in figure 2 it is shown, wherein in an embodiment, optical carrier generation module 500 includes interconnecting mutually
The distributed feedback laser 520 connect and Polarization Controller 540, Polarization Controller 540 and intensity modulator
300 connect.
Distributed feedback laser 520 is as the light source of system, and output center wavelength is 1542.46nm, power
For the continuous light wave of 14.5dBm as light carrier.Polarization Controller 540 is by adjusting this polariser, it is achieved
The correction of the oscillating component of optical signal all directions, is translated into the line polarized light of needs.
Wherein in an embodiment, optical fiber 400 is single-mode fiber.
Single-mode fiber, the medium of optical signal transmission, by this Optical fiber downlinks transmission signal to client.
As in figure 2 it is shown, wherein in an embodiment, light OFDM intensity modulated directly detects communicator
Also include the first amplifier the 600, second amplifier 700 and fibre optic attenuator 800, intensity modulator 300
Being connected with optical fiber 400 by the first amplifier 600, optical fiber 400 is connected with the second amplifier 700, and second
Amplifier 700 is connected with photoelectric detector 420 by fibre optic attenuator 800.
Wherein in an embodiment, the first amplifier 600 and the second amplifier 700 are Er-doped fiber and put
Big device.
Erbium-doped fiber amplifier, carries out pre-amplification by modulating later optical signal, plays amplification.Optical fiber declines
Subtract device 800, form an adjustable attenuator together with erbium-doped fiber amplifier, the optical signal received is carried out
Adjust, be used with applicable demodulation.
As in figure 2 it is shown, wherein in an embodiment, light OFDM intensity modulated directly detects communicator
Also include that oscillography module 900 of sampling, sampling oscillography module 900 are connected with photoelectric detector 420.
Wherein in an embodiment, sampling oscillography module 900 is oscillograph.
Sampling oscilloscope, it is achieved the digital-to-analogue conversion of the signal of telecommunication.Light can be believed by operator by sampling oscilloscope
Number it is analyzed and studies, understanding optical signal during fiber-optic transfer, there occurs which kind of changes, the most permissible
The parameters such as the bit error rate of analysis optical signal and power attenuation rate.
Wherein in an embodiment, arbitrary signal waveform generator 200 is Tektronix AWG710 model
Waveform generator.
The waveform generator of Tektronix AWG710 model is the waveform generator of a excellent performance.
Embodiment described above only have expressed several embodiments of the present utility model, its describe more concrete and
In detail, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, it is right
For those of ordinary skill in the art, without departing from the concept of the premise utility, it is also possible to do
Going out some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, this utility model is special
The protection domain of profit should be as the criterion with claims.
Claims (9)
1. a light OFDM intensity modulated directly detects communicator, it is characterised in that include being sequentially connected with
Ofdm signal transmitter based on HCSLM technology, arbitrary signal waveform generator, intensity modulator,
Optical fiber and photoelectric detector；
Described intensity modulator receives exterior light carrier signal.
Smooth OFDM intensity modulated the most according to claim 1 directly detects communicator, and its feature exists
In, also include optical carrier generation module, described optical carrier generation module and described intensity modulator
Connect.
Smooth OFDM intensity modulated the most according to claim 2 directly detects communicator, and its feature exists
In, described optical carrier generation module includes interconnective distributed feedback laser and Polarization Controller,
Described Polarization Controller is connected with described intensity modulator.
4. directly detect communicator according to the light OFDM intensity modulated described in claim 1 or 2 or 3,
It is characterized in that, described optical fiber is single-mode fiber.
5. directly detect communicator according to the light OFDM intensity modulated described in claim 1 or 2 or 3,
It is characterized in that, also include the first amplifier, the second amplifier and fibre optic attenuator；
Described intensity modulator is connected with described optical fiber by described first amplifier, described optical fiber and described the
Two amplifiers connect, and described second amplifier is connected with described photoelectric detector by described fibre optic attenuator.
Smooth OFDM intensity modulated the most according to claim 5 directly detects communicator, and its feature exists
In, described first amplifier and described second amplifier are erbium-doped fiber amplifier.
7. directly detect communicator according to the light OFDM intensity modulated described in claim 1 or 2 or 3,
It is characterized in that, also including oscillography module of sampling, described sampling oscillography module is connected with described photoelectric detector.
Smooth OFDM intensity modulated the most according to claim 7 directly detects communicator, and its feature exists
In, described sampling oscillography module is oscillograph.
9. directly detect communicator according to the light OFDM intensity modulated described in claim 1 or 2 or 3,
It is characterized in that, described arbitrary signal waveform generator is the waveform generator of Tektronix AWG710 model.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620233756.5U CN205490653U (en) | 2016-03-24 | 2016-03-24 | Light OFDM intensity modulation direct detection communication device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357343A (en) * | 2016-10-09 | 2017-01-25 | 兰州理工大学 | Light-space-time trellis code encoding method suitable for intensity modulation/direction detection |
-
2016
- 2016-03-24 CN CN201620233756.5U patent/CN205490653U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357343A (en) * | 2016-10-09 | 2017-01-25 | 兰州理工大学 | Light-space-time trellis code encoding method suitable for intensity modulation/direction detection |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20190324 |