CN105024672B - The optical fiber F P chamber driving methods with linear compensation function based on DDS - Google Patents
The optical fiber F P chamber driving methods with linear compensation function based on DDS Download PDFInfo
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- CN105024672B CN105024672B CN201510287182.XA CN201510287182A CN105024672B CN 105024672 B CN105024672 B CN 105024672B CN 201510287182 A CN201510287182 A CN 201510287182A CN 105024672 B CN105024672 B CN 105024672B
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Abstract
The present invention proposes a kind of optical fiber F P chamber driving methods with linear compensation function based on DDS, ROM tables including the built-in DDS of FPGA are stored as the sawtooth waveforms data signal of driving power supply, this signal after frequency, phase controlling by by digital-to-analogue conversion and amplifying, and generation is matched with the sawtooth waveforms driving power supply of F P chambers.The features such as present invention has high accuracy and high relevance grade, and linear compensation can flexibly be carried out according to the characteristic of different optical fiber F P chamber piezoelectric ceramics.
Description
Technical field
It is the fiber F-P cavity driving method with linear compensation function based on DDS the present invention relates to technical field.
Background technology
With developing rapidly for fiber optic communication field, through foring a huge industrial structure.At the same time, light
Fine sensing technology also gradually moves to maturity.The device of this field core, such as bifurcation multiplex apparatus and optical switch are directed to light
Fine F-P cavity.On the other hand, in sensory field of optic fibre, fiber F-P cavity is then a mostly important type optical fiber sensor, sensing system
The core component demodulated to signal of uniting is fiber F-P cavity.Have at present to the driving method of fiber F-P cavity a lot, as passing through DDS
Method drives and then has no report using this patent linear compensation method.
Meaning fiber F-P cavity of the invention is driven to be carried in the drive power supply for piezoelectric ceramics of encapsulation F-P cavity.F-P cavity is filter
Wave device, present invention meaning fiber F-P cavity is optical filter, is used as length scanning function element.Such tunable fiber F-P cavity
Characteristic such as Fig. 1.Under sawtooth waveforms driving voltage, in sawtooth waveforms rising edge stage, the centre wavelength of the transmission spectrum of sawtooth waveforms
With magnitude of voltage linear change.But it is due to the hesitation that piezoelectric ceramics has, non-linear mistake can be brought to driving power supply
Very.Therefore, the linear compensation function that the present invention has has its Practical significance.
DDS (Direct Digital Frequency Synthesizer) is Direct Digital Frequency Synthesizers, is a kind of
New frequency synthesis technique, roomy with opposite band, frequency switching time is short, and high resolution and phase continuity are good etc. excellent
Point, it is easy to accomplish frequency, the numerical control modulation of phase and amplitude, is widely used in the communications field.DDS basic block diagram such as Fig. 2
It is shown.
DDS is main to be made up of phase register, frequency control word, waveform look-up table ROM and DAC, phase deposit
Device is made up of adder with register.Often come a clock, the phase that adder just exports frequency control word with phase register
Position data are added, and the result of addition feeds back to the data input pin of phase register again, so that adder is in next clock arteries and veins
Continue to be added with frequency control word in the presence of punching, so, phase register is in the presence of clock, constantly to frequency control word
Linear phase is carried out to add up.And the output data of phase register, as the phase sample address of wave memorizer, thus may be used
So that the waveform sample values being stored in waveform look-up table are found out through tabling look-up, phase is completed to the conversion of amplitude, waveform look-up
The output feeding DAC of table, analog signal output is converted digital signals into by DAC.
In existing article, the linear compensation method typically used has two kinds, and a kind of is that complicated algorithm and hardware are common
The PID of completion is automatically controlled, and this method is excessively cumbersome, another, is to be changed using the method for inverse function in waveform look-up table
Value, but PZT hesitation, temperature drift and crawling effect cause actual driving voltage waveform can not with one it is specific
Function representation, does not have stronger actual operation in this way.
The content of the invention
The present invention proposes a kind of fiber F-P cavity driving method with linear compensation function based on DDS, and this puts method
With high accuracy and the characteristics of high relevance grade, flexibly can linearly it be mended according to the characteristic of different fiber F-P cavity piezoelectric ceramics
Repay.
The present invention use technical scheme for：The fiber F-P cavity driving method with linear compensation function based on DDS, its
It is characterised by：ROM including the built-in DDS of FPGA is stored as the sawtooth waveforms data signal of driving power supply, passes through frequency, phase control
The sawtooth waveforms driving power supply for being matched with F-P cavity is generated by analog-digital chip TLC5615 after system and after amplifying.
Fiber F-P cavity of the present invention is the FFP-TF types of micro-optics company and is encapsulated in PZT, it is characterised in that needed
Want 0~18V sawtooth waveforms power drives.
DDS of the present invention is built-in by FPGA, it is characterised in that using the sawtooth waveforms numerical value of output needed for the storage of ROM tables,
By being exported after frequency and phase-modulation, change by TLC5615 and required sawtooth waveforms driving power supply is produced after amplifying.
Driving method of the present invention has linear compensation function, has hesitation in the PZT of encapsulation F-P cavity, passes through
Corresponding stored waveform numerical value in difference ratio modified R OM tables, linear compensation is carried out to driving power supply waveform.
It is an advantage of the invention that：The characteristics of this method of putting has high accuracy and high relevance grade, can be according to different fiber F-Ps
The characteristic of chamber piezoelectric ceramics flexibly carries out linear compensation.
Brief description of the drawings
Fig. 1 is the F-P cavity driving voltage value of the present invention and the centre wavelength position corresponding diagram of transmitted light.
Fig. 2 is the DDS of present invention schematic diagram.
Fig. 3 is the linear compensation schematic diagram of the function of the present invention.
Embodiment
The present invention is the tunable fiber F-P cavity (FFP-TF) for micro-optics company used, driving needed for it in experiment
Power supply is 0~18V sawtooth voltage signals.Because the DAC chip TLC5615 precision that this experiment is used is looked into for 10bit, i.e. waveform
The storage value looked in table is 0~1024.Do not considering that nonlinear effect is, the magnitude of voltage of the value in ROM tables and output into
Proportional relationship.
However, as shown in figure 3, due to there is the nonlinear effects such as hesitation, can be produced to real waveform certain
Distortion, therefore need to carry out linear compensation.
Based on the deficiency for other compensation methodes mentioned in specification technical background, the present invention proposes one kind such as Fig. 3 institutes
The linear compensation method shown.
Wherein, laFor the rising edge of the sawtooth waveforms of preferable linear increase, lbFor the actual waveform being likely to occur.Then exist
Once relation：
Assuming that：
Δ V=real voltages value-ideal voltage value (formula 2)
Respective value X in ROM tables is then revised as X by formula below1：
So by simply changing the value for needing to compensate in ROM tables, you can flexible that driving power supply signal is carried out
Linear compensation.
Claims (3)
1. a kind of fiber F-P cavity driving method with linear compensation function based on DDS, it includes the built-in ROM of FPGA
Value in the signal waveform correspondence numerical value of driving power supply required for table carrys out storing fiber optic F-P cavity, ROM tables passes through frequency, phase control
After system, 0-5V sawtooth voltages are converted to by analog-digital chip TLC5615, after amplified chip LM358 amplifications, 0- are generated
18V is matched with the sawtooth waveforms driving power supply of F-P cavity, and the PZT of fiber F-P cavity has hesitation, by Real output waveform with
There is nonlinear effect in ROM tables correspondence linear waveform, therefore need to carry out linear compensation to driving power supply waveform.
2. a kind of fiber F-P cavity driving method with linear compensation function based on DDS according to claim 1, its
It is characterised by：
1) fiber F-P cavity is the FFP-TF types of micro-optics company and is encapsulated in PZT, it is characterised in that need 0~18V
Sawtooth waveforms power drives；
2) TLC5615 is the analog-digital chip of 10 precision, and its function is that the value in the ROM tables for will be stored in DDS turns
It is changed to corresponding magnitude of voltage；
3) DDS is to be set up inside FPGA, and storage is linearly increasing corresponding to the 0-1023 of 0-18V driving voltages in ROM in DDS
Value, the value sent to after phase and frequency modulation(PFM) TLC5615 carry out voltage conversion.
3. a kind of fiber F-P cavity driving method with linear compensation function based on DDS according to claim 1, tool
Linear compensation function, implements step as follows：
In ideal voltage value Y and ROM table there is relation in respective value X：
Assuming that：
Δ V=real voltages value-ideal voltage value (formula 2)
Respective value X in ROM tables is then revised as X by formula below1：
So by simply changing the value for needing to compensate in ROM tables, you can flexible that driving power supply signal is carried out linearly
Compensation.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888055A (en) * | 2010-06-23 | 2010-11-17 | 中国科学院上海光学精密机械研究所 | F-P cavity Q switch driven by piezoelectric ceramics |
| CN101982801A (en) * | 2010-10-12 | 2011-03-02 | 华中科技大学 | Piezoelectric-driven F-P cavity tunable filter |
| CN102075280A (en) * | 2010-12-11 | 2011-05-25 | 浙江工业大学 | Tunable Fabry-Perot cavity-based optical wavelength exchange device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040253003A1 (en) * | 2001-07-05 | 2004-12-16 | Wave 7 Optics, Inc. | Gain compensating optical receiver circuit |
| US7999624B2 (en) * | 2007-04-24 | 2011-08-16 | City University Of Hong Kong | Radiation source |
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2015
- 2015-06-01 CN CN201510287182.XA patent/CN105024672B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888055A (en) * | 2010-06-23 | 2010-11-17 | 中国科学院上海光学精密机械研究所 | F-P cavity Q switch driven by piezoelectric ceramics |
| CN101982801A (en) * | 2010-10-12 | 2011-03-02 | 华中科技大学 | Piezoelectric-driven F-P cavity tunable filter |
| CN102075280A (en) * | 2010-12-11 | 2011-05-25 | 浙江工业大学 | Tunable Fabry-Perot cavity-based optical wavelength exchange device |
Non-Patent Citations (1)
| Title |
|---|
| 《基于FPGA的光纤光栅解调系统研究》;赵一柱;《中国优秀硕士学位论文全文数据库》;20140820;第1-65页 * |
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