CN110060707A - A kind of coding method of optical signal and access method and full image storage device - Google Patents
A kind of coding method of optical signal and access method and full image storage device Download PDFInfo
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- CN110060707A CN110060707A CN201810047857.7A CN201810047857A CN110060707A CN 110060707 A CN110060707 A CN 110060707A CN 201810047857 A CN201810047857 A CN 201810047857A CN 110060707 A CN110060707 A CN 110060707A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
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Abstract
The invention discloses a kind of coding method of optical signal and access method and full image storage devices.The coding method of the optical signal controls the Rankine-Hugoniot relations of the pixel of spatial light modulator using controller, so as to adjust the phase distribution for the light beam for passing through pixel, so that there is first phase by the beamlet that first phase pixel is left, there is second phase by the beamlet that second phase pixel is left, wherein, the phase difference of first phase and second phase is 180 degree, it is characterized by: between first pixel and the last one pixel of same rectilinear direction arrangement, there are at least two continuously arranged first phase pixels in continuous three pixels, or there are at least two continuously arranged second phase pixels in continuous three pixels.The present invention can increase the total length of continuous arrangement and the identical position signal of phase in light beam, reduce light beam for the Nyquist aperture size of storage disc with this, to increase the storage volume density of storage disc.
Description
Technical field
The present invention relates to the coding methods and access method of optical information field of storage more particularly to a kind of optical signal
And full image storage device.
Background technique
With the development of science and technology, the required storage dosage of electronic record also and then rises.Common storage mode is record
Variation on storage medium surface magnetically or optically, using the foundation as institute's storing data, such as disk sheet or disc.With electricity
The required storage dosage of sub-file increases, and the technology development of full figure storage starts to attract attention.
Full figure storing technology is a kind of by making to generate interference through signal light and reference light, and image data is written
Information storage technology in storage medium.When reading the data, it through irradiating on reference light to storage medium again, can produce
Raw image data.Then, generated image data is read by detector again.And how to promote the storage of full figure storing technology
Capacity becomes the focus and hot spot of currently associated area research.
Spatial light modulator is the device that the spatial distribution of a kind of pair of light wave is modulated.In general, space light modulation
Device can be to the one-dimensional or Two dimensional Distribution of certain or certain characteristics (such as phase, amplitude or intensity, frequency, polarization state) of light wave
The transformation or modulation of room and time are carried out, so that the information that light wave is carried is written among corresponding memory device.Its
In, it can be to change or arrange according to certain rule by the phase of the light wave of spatial light modulator using corresponding controller
Column, so that being encoded to optical signalling.And how to be situated between by the coding to optical signalling in the fixed storage of capacity
Information as much as possible is recorded in matter, is those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
To overcome defect and deficiency existing in the prior art, the invention discloses a kind of coding methods of optical signal
With access method and full image storage device.
The invention is realized by the following technical scheme:
A kind of coding method of optical signal, using linearly arranging for controller control spatial light modulator
The Rankine-Hugoniot relations of several pixels, wherein the pixel includes first phase pixel and second phase pixel, so as to adjust logical
The phase distribution of the light beam of the pixel is crossed, so that there is first phase by the beamlet that the first phase pixel is left, by
The beamlet that the second phase pixel is left has second phase, wherein the phase difference of the first phase and second phase
It is deposited in continuous three pixels between first pixel and the last one pixel of same rectilinear direction arrangement for 180 degree
There are at least two continuous arrangements in at least two continuously arranged first phase pixels or continuous three pixels
The second phase pixel.
Further, between first pixel and the last one pixel of same rectilinear direction arrangement, there is at least three
A continuously arranged first phase pixel, or there are at least three continuously arranged second phase pixels.
Further, all described between first pixel and the last one pixel of same rectilinear direction arrangement
First phase pixel is continuous arrangement, and all second phase pixels are continuous arrangement.
A kind of access method of optical signal, in optical signal storage, the coding method of the optical signal is to light
It learns signal to be encoded, and the write-in light provided by optical transmitting set is made to pass sequentially through the spatial light modulator and leaded light
Storage disc is injected after module.
Further, when optical signal is read so that the reading light that provides of the optical transmitting set pass sequentially through it is described
It is injected after spatial light modulator and light guide module and forms diffraction light through the storage disc, the diffraction light passes through described
Light guide module injects shearing interferometer, and the diffraction light is converted to parallel to each other, and phase distribution phase by the shearing interferometer
After same the first light beam and the second light beam, first light beam and the second light beam are read out using optical detector.
Further, drop shadow spread on optical detector of first light beam and the second light beam exist partly overlap or
All overlappings.
Further, the overlapping depth of the drop shadow spread of first light beam and the second light beam on optical detector is institute
State the integral multiple of the integral multiple of the length of first phase pixel or the length of the second phase pixel.
A kind of full image storage device of optical signal, the full image storage device use the coding of the optical signal
Method stores optical signal；The full image storage device includes optical transmitting set, spatial light modulator, controller, leaded light
Module and storage disc；The spatial light modulator is optically coupled between the optical transmitting set and storage disc, the control
Device is electrically connected with the spatial light modulator, and the light guide module is optically coupled to the spatial light modulator and storage disc
Between.
Further, further include optical detector, and be optically coupled to cutting between the light guide module and optical detector
Shearing interferometer.
Further, the light guide module includes polarization spectroscope, the first guiding lens, low-pass filter, the second guiding
Lens, quarter-wave plate, reflecting mirror and object lens.
The present invention has the advantages that arrangement position of the present invention by control pixel, to make spatial light modulator to light
The modulation of Shu Jinhang phase code.By carrying out phase code modulation to light beam, continuous arrangement in light beam can be increased and phase is identical
Position signal total length, light beam is reduced for the Nyquist aperture size of storage disc, to increase storage disc with this
Storage volume density.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention is schematic
Examples and descriptions thereof are used to explain the present invention, does not constitute improper limitations of the present invention.
Fig. 1 is that the full image storage device of the optical signal of the embodiment of the present invention carries out the light path schematic diagram of data write-in；
Fig. 2 is the optical transmitting set of the embodiment of the present invention and the configuration schematic diagram of spatial light modulator；
Fig. 3 is that the full image storage device of the optical signal of the embodiment of the present invention carries out the light path schematic diagram of reading data；
Fig. 4 is that the full image storage device of the optical signal of the embodiment of the present invention carries out the first light beam and the when reading data
Two light beams march to the imaging schematic diagram of optical detector；
Fig. 5 is that the full image storage device of the optical signal of the embodiment of the present invention carries out the first light beam and the when reading data
The schematic diagram of the phase distribution of two light beams.
Description of symbols:
100- full image storage device；102- storage disc；110- light source module；112- optical transmitting set；114- spatial light tune
Device processed；116,116a, 116b, 116c, 116d- first phase pixel；118,118a, 118b, 118c, 118d- second phase picture
Element；120- light guide module；122- polarization spectroscope；124- first guides lens；125- low-pass filter；126- second is guided
Lens；128- quarter-wave plate；130- reflecting mirror；132- object lens；140- optical detector；142- shearing interferometer；150- control
Device processed；The first drop shadow spread of A1-；The first subrange of A1a, A1b, A1c, A1d, A1e, A1f, A1g, A1h-；A2- second is projected
Range；The second subrange of A2a, A2b, A2c, A2d, A2e, A2f, A2g, A2h-；L reads light；The first light beam of L1-；L2- second
Light beam；Light is written in R-；R1a, R1b, R1c, R1d, R1e, R1f, R1g, R1h beamlet；S1- first surface；S2- second surface；
W- length；Diffraction light-D.
Specific embodiment
In order to make technological means of the invention achieve the goal with effect it can be readily appreciated that below with reference to being specifically illustrating to this hair
Bright embodiment is described in detail.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example,
Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to upper
The schematic representation for stating term may not refer to the same embodiment or example.Moreover, description specific features, structure,
Material or feature can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, in this hair
The description of " first ", " second " involved in bright etc. is used for description purposes only, and it is relatively important to be not understood to indicate or imply its
Property or implicitly indicate the quantity of indicated technical characteristic.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The embodiment of the invention provides a kind of coding method of optical signal and access method and full image storage devices.
The coding method of the optical signal controls the linearly row of spatial light modulator 114 using controller 150
The Rankine-Hugoniot relations of several pixels of column, wherein the pixel includes first phase pixel 116 and second phase pixel 118,
So as to adjust by the phase distribution of the light beam of the pixel, so that being had by the beamlet that the first phase pixel 116 is left
Have first phase, the beamlet left by the second phase pixel 118 has second phase, wherein the first phase with
The phase difference of second phase is 180 degree, between first pixel and the last one pixel of same rectilinear direction arrangement, even
There are deposit in at least two continuously arranged first phase pixels 116 or continuous three pixels in three continuous pixels
In at least two continuously arranged second phase pixels 118.
Preferably, between first pixel and the last one pixel of same rectilinear direction arrangement, there are at least three
The continuously arranged first phase pixel 116, or there are at least three continuously arranged second phase pixels
118。
It is further preferred that all between first pixel and the last one pixel of same rectilinear direction arrangement
The first phase pixel 116 is continuous arrangement, and all second phase pixels 118 are continuous arrangement.
By above-mentioned coding method, when the total length of continuous arrangement and the identical beamlet of phase increases and is greater than single
When the length of a signal, can reduce focusing bright spot in the areas imaging on storage disc, with this reduce light beam for
The Nyquist aperture size of storage disc, to increase the storage volume density of storage disc.
The embodiment of the invention also provides a kind of access methods of optical signal, in optical signal storage, using described
The coding method of optical signal optical signal is encoded, it may be assumed that control the Rankine-Hugoniot relations of the pixel, and make by light
The write-in light R that transmitter 112 provides injects storage disk after passing sequentially through the spatial light modulator 114 and light guide module 120
Piece 102.When optical signal is read, so that the reading light L that the optical transmitting set 112 provides is passing sequentially through the spatial light
It is injected after modulator 114 and light guide module 120 and forms diffraction light D through the storage disc 102, the diffraction light D passes through
The light guide module 120 injects shearing interferometer 142, and the shearing interferometer 142 is converted to the diffraction light D mutually equal
Row, and after phase distribution identical first light beam L1 and the second light beam L2, using optical detector 140 to the first light beam L1
It is read out with the second light beam L2.
Wherein, drop shadow spread on optical detector of the first light beam L1 and the second light beam L2 exist partly overlap or
All overlappings.Integral multiple or the second phase pixel of the depth of the overlapping for the length of the first phase pixel 116
The integral multiple of 118 length.
The embodiment of the invention also provides a kind of full image storage device of optical signal, the full image storage device is used
The coding method of the optical signal stores optical signal；The full image storage device include optical transmitting set 112,
Spatial light modulator 114, controller 150, light guide module 120 and storage disc 102；The 114 optics coupling of spatial light modulator
Together between the optical transmitting set 112 and storage disc 102, the controller 150 is electrically connected with the spatial light modulator 114
It connects, the light guide module 120 is optically coupled between the spatial light modulator 114 and storage disc 102.Wherein, described to lead
Optical module 120 includes that polarization spectroscope 122, first guides lens 124, low-pass filter 125, second guides lens 126, four
/ mono- wave plate 128, reflecting mirror 130 and object lens 132.Preferably, the full image storage device of the optical signal further includes light
Detector 140, and the shearing interferometer 142 being optically coupled between the light guide module 120 and optical detector 140.
As shown in Fig. 1, full image storage device 100 described in the embodiment of the present invention is coaxial-type framework, the full figure storage
Cryopreservation device 100 carries out data write-in and reading data to storage disc 102.The full image storage device 100 includes light source die
Block 110, light guide module 120, optical detector 140 and shearing interferometer 142.
The light source module 110 includes optical transmitting set 112 and spatial light modulator 114, and the optical transmitting set 112 can
Light beam is provided to spatial light modulator 114, those skilled in the art can according to the actual situation, to the spatial light modulator 114
Model selected, such as penetration spatial light modulator or reflective spatial light modulator and combinations thereof formed space
Optical modulator module.
The light guide module 120 is optically coupled between institute's light source module 110 and optical detector 140, to receive simultaneously
Guide the light beam from light source module 110.The light guide module 120 include polarization spectroscope 122, first guide lens 124,
Low-pass filter 125, second guides lens 126, quarter-wave plate 128, reflecting mirror 130 and object lens 132.
The shearing interferometer 142 is optically coupled between light guide module 120 and optical detector 140, to receive simultaneously
Convert the light beam from the light guide module 120.
It should be noted that various components described in Fig. 1 and its configuration relation are only signal, and not to institute of the present invention
State the limitation of the component Configuration relationship in full image storage device 100.Those skilled in the art can set according to different optical paths
Meter adjusts the relative positional relationship between component.
When carrying out data write-in, write-in light R is provided by optical transmitting set 112, wherein write-in light R includes signal light and ginseng
Examine light.Write-in light R passes sequentially through spatial light modulator 114 by optical transmitting set 112, polarization spectroscope 122, first guides lens
124, low-pass filter 125, second guides lens 126, quarter-wave plate 128, reflecting mirror 130 and object lens 132, and connects
Injection storage disc 102.
The signal light and reference light that write-in light R is included can interfere in generating in storage disc 102, and in storage disc
Interference figure is formed in 102, to record data.Specifically, full image storage device 100 can pass through spatial light modulator pair
The signal light and reference light that write-in light R is included carry out phase-modulation, and using write-in light R made of modulating to storage disk
Piece 102 carries out write-in program.
As shown in Fig. 2, Fig. 2 illustrates the configuration schematic diagram of the optical transmitting set 112 and spatial light modulator 114, it is
Be easy to understand and describe the present invention, the pixel of the spatial light modulator 114 of Fig. 2 be painted in single horizontally-arranged form, however
The contents of the present invention are not limited, and those skilled in the art can under the inspiration of the present invention, adjustment or expansive space light modulation
The pixel coverage of device 114.
As shown in Fig. 2, the optical transmitting set 112 first provides write-in light R to spatial light modulator 114.Spatial light modulator
114 include multiple first phase pixel 116a, 116b, 116c and 116d and multiple second phase pixel 118a, 118b, 118c
And 118d, wherein these pixels can be used to modulate the phase distribution of the write-in light R passed through, be compiled so that write-in light R becomes by phase
The optical signal of code.Specifically, it is written in light R, can have the first phase by the part of first phase pixel 116a-116d
Position, and can have second phase, and the phase of first phase and second phase by the part of second phase pixel 118a-118d
Potential difference is 180 degree (or phase difference of pi).
In some embodiments of the invention, first phase with 0 with 0 degree (or indicating), and second phase is with 180
It spends (or being indicated with π).In addition, the first phase pixel 116a-116d and second phase pixel of spatial light modulator 114
118a-118d can be of the same size, and all have length W.
In addition, the spatial light modulator 114 is electrically connected with controller 150, wherein controller 150 can control space
Rankine-Hugoniot relations between the first phase pixel 116a-116d and second phase pixel 118a-118d of optical modulator 114, so that
The first phase pixel 116a-116d of spatial light modulator 114 and the Rankine-Hugoniot relations of second phase pixel 118a-118d can accord with
Unify fixed coding rule.
The coding rule refers to that first phase pixel 116a-116d and second phase pixel 118a-118d are along straight line
Direction is staggered, and between first pixel linearly arranged and the last one pixel, continuous three pixels
It is middle that there are the pixels of at least two continuous arrangements and corresponding same phase.For example, can have at least two in continuous three pixels
A continuously arranged first phase pixel, or there are at least two continuously arranged second phase pixels.That is, for
For the pixel of two corresponding same phases, between there is no the pixels that single one corresponds to another phase.
By taking Fig. 2 as an example, the first phase pixel 116a-116d and second phase pixel 118a-118d are along straight line
Direction is staggered, wherein first pixel to the last one pixel from left to right is sequentially second phase pixel 118a,
Two phase pixel 118b, first phase pixel 116a, first phase pixel 116b, first phase pixel 116c, second phase picture
Plain 118c, second phase pixel 118d and first phase pixel 116d, and second phase pixel 118b and second phase picture
There are three continuously arranged first phase pixel 116a-116c between plain 118c, and first phase pixel 116c and the first phase
There is also two continuously arranged second phase pixel 118c-118d between the pixel 116d of position.
Under this configuration, after light R is written across spatial light modulator 114 shown in Fig. 2, write-in light R can be divided into eight
Beamlet R1a, R1b, R1c, R1d, R1e, R1f, R1g, R1h, and its phase is sequentially π, π, 0,0,0, π, π, 0 respectively.When writing
After entering light R injection storage disc 102, this phase modulated through spatial light modulator 114 will be recorded in storage disc 102
It is interior.
It should be noted that the first phase pixel 116a-116d and second of spatial light modulator 114 of the present invention
Rankine-Hugoniot relations between phase pixel 118a-118d is not depicted as limiting with Fig. 2, in other embodiments, first phase pixel
The Rankine-Hugoniot relations of 116a-116d and second phase pixel 118a-118d can also be done under conditions of meeting coding rule to be changed,
For example, first pixel to the last one pixel from left to right is sequentially also possible to two first phase pixels, two
Two phase pixel, two first phase pixels, two second phase pixels, i.e. its corresponding phase can be sequentially 0 respectively, 0,
π、π、0、0、π、π。
As shown in figure 3, when carrying out reading data light guide module 120 can will be come from by shearing interferometer 142
Light beam be directed to optical detector 140, wherein shearing interferometer 142 can be reflective shearing plate.
Specifically, when being read out, optical transmitting set 112, which provides, reads light L, allows and reads light L from optical transmitting set
112 sequentially guide lens 124, low-pass filter 125, second by spatial light modulator 114, polarization spectroscope 122, first
Guiding lens 126, quarter-wave plate 128, the second reflecting mirror 130 and object lens 132 simultaneously inject storage disc 102, to make to read
Light L is taken to become diffraction light D through diffraction is generated in storage disc 102.Then, diffraction light D is again along the path row of original optical path
It proceeds to polarization spectroscope 122 and shearing interferometer 142 is directed to by polarization spectroscope 122.
Diffraction light D of the shearing interferometer 142 to receive the polarization spectroscope 122 from light guide module 120, and will be around
It penetrates light D and is converted to the first light beam L1 and the second light beam L2 parallel to each other.Specifically, shearing interferometer 142 has in parallel
First surface S1 and second surface S2, wherein when diffraction light D marches to shearing interferometer 142, one of diffraction light D
The first light beam L1 is reflected and become in branch in the first surface S1 of shearing interferometer 142, and another part of diffraction light D can be in
The second surface S2 of shearing interferometer 142 reflects and becomes the second light beam L2.Since the first light beam L1 and the second light beam L2 are
It is converted by diffraction light D, therefore the phase of the phase distribution of diffraction light D, the phase distribution of the first light beam L1 and the second light beam L2
Distribution substantially can be identical.In other words, for parallel the first light beam L1 and the second light beam L2, the first light beam L1 and
Difference between two light beam L2 is to have a range difference on the direction perpendicular to direction of travel each other.
In addition to this, the first light beam L1 and the second light beam L2 made of the conversion of shearing interferometer 142 can overlap each other.
Specifically, the first light beam L1 can march to optical detector 140 along the first optical path self cleavage interferometer 142, and the second light beam
L2 can march to optical detector 140 along the second optical path self cleavage interferometer 142, and the first optical path and the second optical path can parts
Overlapping, wherein the first optical path can be first phase pixel 116a-116d or second phase picture with the overlapping depth of the second optical path
Between the first light beam L1 and the second light beam L2 that the integral multiple of the length W of plain 118a-118d, i.e. self cleavage interferometer 142 leave
Dislocation distance be first phase pixel 116a-116d or second phase pixel 118a-118d length W integral multiple.It connects
, the first light beam L1 and the second light beam L2 made of the conversion of shearing interferometer 142 can advance towards optical detector 140, and by light
Detector 140 is received and is read out.
As shown in Fig. 3,4 and 5, when the first light beam L1 and the second light beam L2 self cleavage interferometer 142 march to optical detector
When 140, the first light beam L1 and the second light beam L2 can overlap each other in the drop shadow spread of optical detector 140.
First light beam L1 is indicated in the drop shadow spread on optical detector 140 with the first drop shadow spread A1, and the first projection model
Eight first subranges A1a, A1b, A1c, A1d, A1e, A1f, A1g, A1h can be divided by enclosing in A1, wherein the first subrange
The phase of A1a-A1h respectively can corresponding diagram 2 write-in light R beamlet R1a-R1h phase, i.e. the first subrange A1a-A1h
Phase can be π, π as shown in Fig. 5,0,0,0, π, π, 0 respectively, and this phase distribution can be seen as the first light beam L1's
Phase code.
Second light beam L2 is indicated in the drop shadow spread on optical detector 140 with the second drop shadow spread A2, and the second projection model
Eight second subranges A2a, A2b, A2c, A2d, A2e, A2f, A2g, A2h can be divided by enclosing in A2, wherein the second subrange
The phase of A2a-A2h respectively can corresponding diagram 2 write-in light R beamlet R1a-R1h phase, i.e. the second subrange A2a-A2h
Phase be π, π as shown in Fig. 5,0,0,0, π, π, 0 respectively, and this phase distribution can be seen as the phase of the second light beam L2
Position coding.
Since the first drop shadow spread A1 is Chong Die with the second drop shadow spread A2, therefore it can occur to do on optical detector 140
Relate to, and result of interference can have to its phase distribution it is related.Specifically, the first light beam L1 and the second light beam L2 can pass through in light
It interferes on detector 140 and is converted to intensity distribution form from phase distribution form.For example, when the of overlapping
When phase corresponding to one subrange A1a-A1h and the second subrange A2a-A2h is π and 0 (or 0 and π), in optical detector
Intensity on 140 can be defined as 1, wherein focusing bright spot can be generated in optical detector 140 by being defined as 1 intensity, and when overlapping
When phase corresponding to first subrange A1a-A1h and the second subrange A2a-A2h is all π (π and π) or is all 0 (0 and 0),
It can be defined as 0 in the intensity on optical detector 140.The the second light beam L2 to be overlapped each other by such conversion regime and first
The optical signal that the phase information of light beam L1 is convertible into as intensity coding, so that optical detector 140 be made to can be read and with two
The form of system records this signal.
For example, the subrange quantity due to overlapping each other between the first drop shadow spread A1 and the second drop shadow spread A2
It is seven, therefore it can produce seven intensity signals, will illustrate one by one below.In the first drop shadow spread A1 and the second drop shadow spread
In the overlapping range of A2, the phase of the first subrange A1b and the second subrange A2a that overlap each other are respectively π and π, therefore it is thoroughly
Intensity signals made of interference is converted are crossed as 0；The phase of the first subrange A1c and the second subrange A2b that overlap each other
Respectively 0 and π, therefore it penetrates intensity signals made of interference is converted as 1；The the first subrange A1d to overlap each other and second
The phase of subrange A2c is respectively 0 and 0, therefore it penetrates intensity signals made of interference is converted as 0；First to overlap each other
The phase of subrange A1e and the second subrange A2d are respectively 0 and 0, therefore intensity signals made of it is converted through interference are
0；The phase of the first subrange A1f and the second subrange A2e that overlap each other are respectively π and 0, therefore it is converted through interference
Made of intensity signals be 1；The phase of the first subrange A1g and the second subrange A2f that overlap each other are respectively π and π, therefore
It penetrates intensity signals made of interference is converted as 0；The phase of the first subrange A1h and the second subrange A2g that overlap each other
Position is respectively 0 and π, thus its converted through interference made of intensity signals into 1, also that is, the first light beam L1 and the second light beam L2
In the intensity coding that optical detector 140 is recorded can be 0100101, and its be in the form of binary record.
Through the above configuration, for the phase code of the first light beam L1 and the second light beam L2, due in two correspondences
There is no the subrange that single one corresponds to another phase between the subrange of same phase, therefore continuous arrangement and phase phase
The total length of same subrange can be more than the length of single a position signal.
When the phase code message of record generates in storage disc 102 and focuses bright spot, the intensity for focusing bright spot can
It is expressed as G (U), in which:
W is the total length of the continuous arrangement in light beam and the identical beamlet of phase, and U is to focus bright spot in storage disc
On coordinate, λ is the wavelength for marching to the light beam of storage disc, and f is the focal length of object lens.
When to take the first zero for focusing bright spot, can enable G (U) is zero, i.e.,And because
Sinc 1=0, therefore know at this timeIt is collated to obtain
According toFocusing bright spot can beamlet identical with continuous arrangement and phase in the coordinate on storage disc
Total length be inversely proportional, therefore, when the total length of continuous arrangement and the identical beamlet of phase increases and is greater than single a position news
Number length when, can reduce focus bright spot in the areas imaging on storage disc.
For example, in Fig. 2, beamlet R1c-R1e is three continuous arrangements and the identical beamlet of phase, and its
Signal total length when leaving from spatial light modulator 114 is 3W.That is, the minimum period of whole string encoding signal can be big
It in or equal to 2W, that is, is not in the coding signal for having the period for W.Therefore, the first zero width after focusing can at least subtract
Half, therefore Nyquist aperture also can at least reduce half, wherein Nyquist aperture may be regarded as writing data into storage disc
The minimum focal zone of light beam.The Nyquist aperture size of bright spot is focused due to reducing, therefore can increase the list of storage disc
The data writing of position volume, that is, increase the storage volume density of storage disc.In addition to this, due to the first light beam and
Two light beams are that phase code is converted to intensity coding through the mode of interference, therefore because of the aberration or storage disc of optical module
Offset caused by noise can be eliminated when being interfered, use promoted full image storage device the miscellaneous ratio of news.
The also replaceable optical module for other patterns of shearing interferometer used in above embodiment, for example,
Bifrequency formula grating substitution shearing interferometer can be used, so that diffraction light be made to can pass through two kinds of skies on bifrequency formula grating
Between frequency conversion be the first light beam and the second light beam.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of coding method of optical signal, linearly using controller (150) control spatial light modulator (114)
The Rankine-Hugoniot relations of several pixels of arrangement, wherein the pixel includes first phase pixel (116) and second phase pixel
(118), so as to adjust by the phase distribution of the light beam of the pixel, so that left by the first phase pixel (116)
Beamlet has first phase, has second phase by the beamlet that the second phase pixel (118) is left, wherein described
The phase difference of first phase and second phase be 180 degree, it is characterised in that: along same rectilinear direction arrangement first pixel with
Between the last one pixel, there are at least two continuously arranged first phase pixels (116) in continuous three pixels,
Or there are at least two continuously arranged second phase pixels (118) in continuous three pixels.
2. the coding method of optical signal according to claim 1, it is characterised in that: along the of the arrangement of same rectilinear direction
Between one pixel and the last one pixel, there are at least three continuously arranged first phase pixels (116), or deposit
In at least three continuously arranged second phase pixel (118).
3. the coding method of optical signal according to claim 1, it is characterised in that: along the of the arrangement of same rectilinear direction
All first phase pixels (116) between one pixel and the last one pixel are continuous arrangement, all described second
Phase pixel (118) is continuous arrangement.
4. a kind of access method of optical signal, it is characterised in that: in optical signal storage, using in such as claim 1-3
The coding method of optical signal described in any one encodes optical signal, and to be provided by optical transmitting set (112)
Write-in light (R) inject storage disc (102) afterwards passing sequentially through the spatial light modulator (114) and light guide module (120).
5. the access method of optical signal according to claim 4, it is characterised in that: when optical signal is read, so that
The reading light (L) that the optical transmitting set (112) provides is passing sequentially through the spatial light modulator (114) and light guide module
(120) it injects afterwards and forms diffraction light (D) through the storage disc (102), the diffraction light (D) passes through the light guide module
(120) inject shearing interferometer (142), the shearing interferometer (142) the diffraction light (D) is converted to it is parallel to each other, and
After identical first light beam (L1) of phase distribution and the second light beam (L2), using optical detector (140) to first light beam
(L1) it is read out with the second light beam (L2).
6. the access method of optical signal according to claim 5, it is characterised in that: first light beam (L1) and second
Drop shadow spread of the light beam (L2) on optical detector, which exists, to be partly overlapped or is all overlapped.
7. the access method of optical signal according to claim 6, it is characterised in that: first light beam (L1) and second
The overlapping depth of drop shadow spread of the light beam (L2) on optical detector is the integral multiple of the length of the first phase pixel (116)
Or the integral multiple of the length of the second phase pixel (118).
8. a kind of full image storage device of optical signal, it is characterised in that: the full image storage device uses such as claim 1-3
Any one of described in the coding method of optical signal optical signal is stored；The full image storage device includes light hair
Emitter (112), spatial light modulator (114), controller (150), light guide module (120) and storage disc (102)；The space
Optical modulator (114) is optically coupled between the optical transmitting set (112) and storage disc (102), the controller (150) with
Spatial light modulator (114) electrical connection, the light guide module (120) are optically coupled to the spatial light modulator (114)
Between storage disc (102).
9. the full image storage device of optical signal according to claim 8, it is characterised in that: further include optical detector
And the shearing interferometer (142) that is optically coupled between the light guide module (120) and optical detector (140) (140),.
10. the full image storage device of optical signal according to claim 8, it is characterised in that: the light guide module (120)
Including polarization spectroscope (122), the first guiding lens (124), low-pass filter (125), the second guiding lens (126), four points
One of wave plate (128), reflecting mirror (130) and object lens (132).
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