EP1060427A1 - Grilles de diffraction composites pour traitement de signaux et applications de guides optiques - Google Patents

Grilles de diffraction composites pour traitement de signaux et applications de guides optiques

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Publication number
EP1060427A1
EP1060427A1 EP99901373A EP99901373A EP1060427A1 EP 1060427 A1 EP1060427 A1 EP 1060427A1 EP 99901373 A EP99901373 A EP 99901373A EP 99901373 A EP99901373 A EP 99901373A EP 1060427 A1 EP1060427 A1 EP 1060427A1
Authority
EP
European Patent Office
Prior art keywords
subgratings
input
composite
operative
grating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99901373A
Other languages
German (de)
English (en)
Other versions
EP1060427A4 (fr
Inventor
William R. Babbitt
Thomas W. Mossberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Templex Technology Inc
Original Assignee
Templex Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Templex Technology Inc filed Critical Templex Technology Inc
Publication of EP1060427A1 publication Critical patent/EP1060427A1/fr
Publication of EP1060427A4 publication Critical patent/EP1060427A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/29311—Diffractive element operating in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G02B5/1819—Plural gratings positioned on the same surface, e.g. array of gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/88—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
    • G06V10/89—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators
    • G06V10/893—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators characterised by the kind of filter
    • G06V10/895—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators characterised by the kind of filter the filter being related to phase processing, e.g. phase-only filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/005—Optical Code Multiplex
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12083—Constructional arrangements
    • G02B2006/12107—Grating

Definitions

  • the present invention relates to spectral filtering, optical communications, optical multiplexing, optical code-division multiple access, and optical code generation and detection.
  • the present invention provides a structure (i.e. a diffractive grating of unique design) which performs a programmed complex- valued, spectral filtering function on an input optical signal.
  • the gratings fabricated in accordance with the present invention are composite gratings in the sense that they consist of a plurality of subgratings. Subgratings may be either physically distinct or exist only in the sense of a Fourier decomposition of a complex spatial profile. Each subgrating controls the diffraction of a specific optical subbandwidth of light from an operative input direction to an operative output direction.
  • the set of subgratings comprising the composite grating collectively control the diffraction of an operative bandwidth of light from an operative input direction to an operative output direction.
  • Each subgrating imparts a controllable amplitude and phase change onto the specific subbandwidth of light whose diffraction it controls within the overall operative bandwidth.
  • Composite gratings according to the present invention are programmed through their construction or through their dynamic modification to provide desired spectral filtering functions. In the programming process, the physical parameters of the subgratings, such as spatial phase, amplitude, spatial period, and so on are configured and set so that each subgrating provides the desired amplitude and phase change to the subbandwidth whose diffraction it controls.
  • Composite gratings according to the present invention can be employed for general spectral filtering applications, they hold especially attractive potential in the area of optical waveform processing, generation, and detection. It is understood that optical waveforms can be coded so as to represent information and therefore the present invention applies to optical data processing, generation, and detection.
  • Composite gratings according to the present invention have numerous specific embodiments and settings.
  • Composite gratings according to the present invention can be implemented as volume, surface, or waveguide gratings and constructed using frequency- selective active materials such as europium-doped yttrium oxide. They can be implemented in the same forms using active materials having no intrinsic frequency selectivity such as glass or lithium niobate.
  • the key design element of the present composite grating invention is the use of subgratings, having either Fourier or physical definition, to control the diffraction of subbandwidths of light from an operative input to an operative output direction.
  • Control here means that the structural properties of a subgrating determine the phase and amplitude factors that relate the output and input optical fields within the subbandwidth assigned to the subgrating.
  • the subgratings comprising a composite grating control subbandwidths that are substantially non-overlapping although absence of subbandwidth overlap is not necessary. It is necessary that the subbandwidths collectively controlled by the subgratings must span the full operative bandwidth of the composite grating.
  • Composite gratings according to the present invention are fundamentally different from grating devices known in the art. ICnown gratings accept multicolored light incident along a certain input direction and disperse it so that each color emerges along a path that is angularly separated from the paths of other incident colors. Composite gratings according to the present invention accept multicolored light incident along a certain input direction and diffract a portion of each color into the operative output direction while simultaneously modifying the relative amplitudes and phases of the various constituent colors. Composite grating devices after the present invention can be used, for example, in Optical Code-Division Multiple Access (OCDMA) data links.
  • OCDMA Optical Code-Division Multiple Access
  • the composite grating devices are used to code optical signals within multiple communications channels with channel-specific time codes and then differentially detect channels based on their impressed time code.
  • the ability to impress channel specific time-codes and then differentially detect on the basis of time-code allows for the multiplexing of multiple time- code differentiated optical communication channels on a single transport means.
  • the composite surface gratings of the present invention can be utilized in any application area wherein the ability to effect spectral filtering is utilized, such as temporal pattern recognition, spectral equalization, optical encryption and decryption, and dispersion compensation.
  • Figure 1 is a diagram of the interaction of a bichromatic incident radiation field with a composite surface grating composed of two subgratings, causing the generation of output diffracted beams.
  • Figures 2A and 2B are depictions of the functioning of a composite diffraction grating in accordance with the present invention applied to temporal waveform recognition.
  • the composite grating depicted is programmed through construction or dynamically to generate optical signals propagating along an operative output direction and having a recognition temporal waveform in response to optical signals incident on the grating along the operative input direction and possessing an specific address temporal waveform.
  • the address and recognition waveforms are different and the recognition waveform is only generated in response to those input optical signals bearing the address temporal waveform.
  • an optical signal whose temporal waveform is substantially different from the address temporal waveform programmed into the composite grating impinges on the grating causing the generation of an output signal whose temporal waveform differs substantially from the recognition waveform.
  • the light beams and grating described here have been given a variety of attributes for purposes of exposition. The assignment of those attributes is not meant to be limiting in any fashion to the present invention.
  • the attributes assigned for exposition purposes include: plane wave optical beam character, transmissive grating geometry, translational invariance along y, planar grating geometry, surface-plane grating location, sinusoidal subgrating character, and operation in the first diffractive order.
  • plane wave optical beam character transmissive grating geometry, translational invariance along y, planar grating geometry, surface-plane grating location, sinusoidal subgrating character, and operation in the first diffractive order.
  • the composite grating device constitutes a complex spectral filter with specific transfer function for a chosen operative input direction and a specific operative output direction.
  • Optical signals carrying arbitrary temporal waveforms can be expanded as in Equation 1.
  • the spacing between frequency components must be comparable to or less than the inverse waveform duration and the expansion must encompass enough spectral components to cover the spectral range occupied by the optical signal.
  • the grating is ruled witii N g multiple sinusoidal transmission subgratings whose summed amplitude transmission function is given by
  • a t is real
  • x is a unit directional vector along the x-coordinate direction
  • ⁇ is the spatial period of they ' th subgrating
  • ⁇ t is the spatial phase of theyth subgrating at r 0 .
  • the spatial phases of the subgratings, ⁇ Jt are of critical importance in the present invention for they provide control over the optical phases of the diffracted spectral components.
  • ⁇ , is real, i.e. that the subgratings are amplitude only subgratings has been made for simplicity of illustration and is not meant to be limiting of the current invention.
  • the diffracted output field resulting from the interaction of the /th input spectral component with theyth subgrating can be written as
  • Equation 3 provides the usual constraint on input and output directions, A te and k tj , respectively, i.e.
  • w is the operative output angle.
  • the propagation vector corresponding to the operative output direction is designated k oul .
  • the signal propagating in the operative output direction can be written as
  • each spectral component has been provided a subgrating configured to diffract a portion of the spectral component into the operative output direction.
  • Each spectral component in the operative output beam is multiplied by a factor H Tom whose phase and amplitude is determined by the spatial phase and
  • E*° (r,t) thus represents a spectrally filtered version of the
  • the filtering function is determined through programming of the composite grating during its production or dynamically during its operation.
  • An arbitrary filtering function H(v) may be applied in discretized form provided the discretization is sufficiently fine.
  • ⁇ q. 6 indicates that a discretized form of the transfer function is applied if H ti is set equal to H(v).
  • ⁇ q. 4 then specifies the necessary amplitude and spatial phase for the subgrating that maps the subbandwidth of light in the vicinity of v, from the operative input to operative output direction.
  • a set of subgratings is written upon the surface of a substrate to form a composite grating.
  • the subgratings are operative to diffract incident radiation from a chosen operative input direction into a chosen operative output direction.
  • the composite grating imparts a programmed spectral filtering function.
  • the programmed spectral filtering function acts to transform input pulses having a specific address temporal waveform into output pulses having a specific recognition temporal waveform.
  • the composite grating in this instance effectively acts as a temporal waveform converter. This function can be employed so as to be equivalent to temporal waveform detection.
  • FIGS. 2 A and 2B show the operation of a composite surface grating used as a temporal waveform converter/detector in accordance with the present invention.
  • Input path 101 is substantially similar to the designed operative input path of composite surface grating 102 and output path 104 is substantially similar to the designed operative output path of composite grating 102.
  • incident optical waveform 100A is substantially similar to the programmed address temporal waveform of composite grating 102
  • output optical waveform 103 A along operative output path 104 is substantially similar to the programmed recognition temporal waveform of composite grating 102.
  • incident optical waveform 100B is substantially dissimilar to the programmed address temporal waveform of complex grating 102
  • the output optical waveform 103B along operative output direction 104 is substantially dissimilar to the programmed recognition temporal waveform of complex grating 102.
  • any input signal propagating along 101 and containing spectral components within the operative bandwidth of the composite grating will produce an output signal along the operative output direction.
  • the output signal will have the specific programmed recognition waveform only if the input signal has the programmed address waveform.
  • the design of a composite surface grating in accordance with this embodiment of the present invention is now considered. First specified are the address and recognition temporal waveforms and their central frequencies.
  • the minimum spectral structure width of optical signals carrying the address or recognition temporal waveforms is the minimal spectral structure width of optical signals carrying the address or recognition temporal waveforms.
  • the Minimum Spectral Structure Width is the minimum frequency distance over which the Fourier spectra of optical signals laden with either the address or recognition waveform exhibit structure.
  • the minimum spectral structure width can be set equal to the inverse of the larger of the address or recognition temporal waveform duration.
  • the minimum spectral structure width is important because it sets the maximal frequency bandwidth that can be controlled by individual subgratings comprising the composite grating. This in turn means that subgratings must have a spectral resolution as fine as or finer than the minimum spectral structure width.
  • the bandwidth of optical signals carrying the recognition waveform, ⁇ v m consult or address waveform, Sv in are derivable from the respective waveforms specified.
  • the minimum spectral structure width also represents the minimum spectral resolution needed to encode or program a spectral transfer function of interest into a composite grating.
  • its operative input and output directions must be specified.
  • the operative input and output angles, and therefore subgrating periodicities are chosen according to convenience according to equation 5 subject to substrate and production constraints that limit the range of subgrating periods that can be conveniently implemented.
  • Choice of operative angles is also influenced by the need to make the spectral resolution of the subgratings finer than the minimal spectral structure width.
  • the grating spectral resolution is given by
  • c is the speed of light in the environment of the composite grating and £ is the subgrating width.
  • £ is the subgrating width.
  • choice of operative angles providing the maximal angular change from input to output provides maximal spectral resolution.
  • Providing for the operative output direction to be essentially anti-parallel to the operative input direction maximizes grating spectral resolution for fixed grating width.
  • the quantity l/ ⁇ v g the grating processing time, is important as it provides an upper limit on the temporal length of the waveforms that can be distinguished with complete uniqueness. If a signal having duration longer than ⁇ l ⁇ v g is made incident on a composite grating, the instantaneous output signal will derive from a subduration of the input signal of
  • N gmi convinced is equal to the bandwidth of the desired recognition temporal waveform divided by the minimal spectral structure width.
  • a composite grating may be fabricated through multiple exposure wherein each exposure creates a subgrating with specific period, amplitude, and spatial phase.
  • the subgrating parameters can be programmed so as to map a specific subbandwidth of light from the operative input direction to the operative output direction.
  • E out (v) H(v)E in (v), where E in (v) and E ml (v) are the spectra of optical signals incident along the operative input direction and emergent along the operative output direction, respectively.
  • E in (v) and E ml (v) are the spectra of optical signals incident along the operative input direction and emergent along the operative output direction, respectively.
  • H(v) aE' A (v)
  • the cross-correlation consists primarily of a powerful, short pulse when the input and address waveforms ride on the same carrier frequency and are essentially identical.
  • the direct relationship between the amplitudes and phases of the subgratings comprising a composite grating and those of the Fourier components of the address waveform shown in Equation 9 demonstrates that the spatial profile of a composite grating programmed to recognize an address waveform is very simply related to the address waveform itself.
  • the composite grating can be viewed as a spatial carrier wave having an envelope function. Examination of the equations above reveals that the spatial waveform of the composite grating is given by an appropriately scaled Fourier transform of the desired spectral filtering function.
  • the various composite gratings may have a common operative input direction and differing operative output directions wherein each composite grating and hence each operative output direction provides a different spectral filtering function.
  • the composite gratings may have a common, operative, output direction and differing, operative, input directions wherein each input direction produces output signals having experienced a different spectral filtering function. It is also possible that superimposed composite gratings each have unique operative input and output directions.
  • a composite grating is configured so that its operative input and output directions lie anti-parallel along the line containing the subgrating spatial wavevector.
  • the composite grating is constructed to specifically accept and process input optical signals carrying a brief temporal waveform.
  • the composite grating is specifically programmed so as to produce output optical signals carrying a temporally brief recognition temporal waveform in response to input pulses carrying a specific address temporal waveform.
  • said composite grating is embedded within the volume of a substrate of active material.
  • said substrate consists of an optical waveguide which might be an optical fiber.
  • said subgratings possess a position dependent amplitude and phase, leading to a position dependent reflectivity.
  • the processing time of a composite grating having anti-parallel operative input and output directions can be increased if the grating is embedded within a substrate of refractive index n. In this case, the grating
  • the spatial wavelength of each subgrating is equal, according to the diffraction condition, to l ⁇ the wavelength of the subbandwidth that the particular subgrating is designed to diffract. If the light interacts with the grating while propagating within a material, it is the wavelength of light in the material that is referred to above.
  • the physical length, £ of the grating must be chosen to ensure that the spectral resolution of the composite grating is sufficient to resolve the minimum spectral structure width characteristic of the desired spectral transfer function.
  • n the optical path length
  • n£ the optical path length that determines the grating resolution ratiier than the physical length, £ .
  • Composite gratings wherein the operative input and output directions are anti- parallel and lie along the line containing the subgrating spatial wavevectors can be constructed within optical waveguides and optical fibers.
  • a subgrating typically comprises a periodic modulation of the index of refraction of the guided wave region, the cladding region, or both.
  • the subgratings must be configured with spatial phases and amplitudes as needed to effect a desired spectral transfer function.
  • the amplitude of subgratings can be tapered to be relatively smaller at the input end of the composite grating and relatively larger at the opposite end. The taper serves to equalize the light backscattered as the input light is attenuated.
  • composite gratings can be constructed operative to accept electromagnetic radiation from within any segment of the electromagnetic spectrum from radio, to microwave, to infrared, to visible, to ultraviolet, and beyond. While the invention has been described wim respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in format and detail may be made without departing from the spirit and scope of the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Mathematical Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optical Communication System (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

La présente invention porte sur une structure de grille optique qui effectue une fonction programmée de filtrage spectral complexe sur un signal optique d'entrée. La grille comprend une pluralité de sous-grilles. Chaque sous-grille guide la diffraction d'une sous-largeur de bande optique spécifique de lumière, d'un sens d'introduction fonctionnel à un sens d'émission fonctionnel conférant une amplitude et une variation de phase contrôlables sur la sous-largeur de bande spécifique de lumière que la diffraction régule dans la largeur de bande fonctionnelle globale. Chaque grille composite est programmée par sa structure ou sa modification dynamique de façon à obtenir des fonctions de filtrage spectral spécifiques. Tandis que les grilles composites peuvent être utilisées dans des applications générales de filtrage spectral, elles conservent un potentiel spécifiquement attractif dans la zone de traitement, génération et détection de formes d'ondes.
EP99901373A 1998-01-07 1999-01-07 Grilles de diffraction composites pour traitement de signaux et applications de guides optiques Withdrawn EP1060427A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US7068498P 1998-01-07 1998-01-07
US70684P 1998-01-07
PCT/US1999/000425 WO1999035523A1 (fr) 1998-01-07 1999-01-07 Grilles de diffraction composites pour traitement de signaux et applications de guides optiques

Publications (2)

Publication Number Publication Date
EP1060427A1 true EP1060427A1 (fr) 2000-12-20
EP1060427A4 EP1060427A4 (fr) 2006-01-25

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EP99901373A Withdrawn EP1060427A4 (fr) 1998-01-07 1999-01-07 Grilles de diffraction composites pour traitement de signaux et applications de guides optiques

Country Status (5)

Country Link
EP (1) EP1060427A4 (fr)
JP (1) JP2002501213A (fr)
KR (1) KR20010033934A (fr)
CA (1) CA2317784A1 (fr)
WO (1) WO1999035523A1 (fr)

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USRE42206E1 (en) 2000-03-16 2011-03-08 Steyphi Services De Llc Multiple wavelength optical source
USRE41570E1 (en) 2000-03-16 2010-08-24 Greiner Christoph M Distributed optical structures in a planar waveguide coupling in-plane and out-of-plane optical signals
US6987911B2 (en) 2000-03-16 2006-01-17 Lightsmyth Technologies, Inc. Multimode planar waveguide spectral filter
US7773842B2 (en) 2001-08-27 2010-08-10 Greiner Christoph M Amplitude and phase control in distributed optical structures
USRE42407E1 (en) 2000-03-16 2011-05-31 Steyphi Services De Llc Distributed optical structures with improved diffraction efficiency and/or improved optical coupling
US6879441B1 (en) 2000-03-16 2005-04-12 Thomas Mossberg Holographic spectral filter
US6965464B2 (en) 2000-03-16 2005-11-15 Lightsmyth Technologies Inc Optical processor
FR2814548B1 (fr) * 2000-09-26 2003-02-21 Jobin Yvon S A Procede optique de diffraction de la lumiere, systeme optique et dispositif correspondants
FR2822241B1 (fr) * 2001-03-15 2003-08-22 Teem Photonics Structure guidante permettant de transformer un mode de propagation de profil de type gaussien en un mode de propagation de profil de type elargi
US7224855B2 (en) 2002-12-17 2007-05-29 Lightsmyth Technologies Inc. Optical multiplexing device
US7260290B1 (en) 2003-12-24 2007-08-21 Lightsmyth Technologies Inc Distributed optical structures exhibiting reduced optical loss
US7181103B1 (en) 2004-02-20 2007-02-20 Lightsmyth Technologies Inc Optical interconnect structures incorporating sets of diffractive elements
US7120334B1 (en) 2004-08-25 2006-10-10 Lightsmyth Technologies Inc Optical resonator formed in a planar optical waveguide with distributed optical structures
US7327908B1 (en) 2005-03-07 2008-02-05 Lightsmyth Technologies Inc. Integrated optical sensor incorporating sets of diffractive elements
US7349599B1 (en) 2005-03-14 2008-03-25 Lightsmyth Technologies Inc Etched surface gratings fabricated using computed interference between simulated optical signals and reduction lithography
US7643400B1 (en) 2005-03-24 2010-01-05 Lightsmyth Technologies Inc Optical encoding of data with distributed diffractive structures
US7190856B1 (en) 2005-03-28 2007-03-13 Lightsmyth Technologies Inc Reconfigurable optical add-drop multiplexer incorporating sets of diffractive elements
CN109893084A (zh) 2014-06-20 2019-06-18 拉姆伯斯公司 用于有透镜和无透镜的光学感测的系统和方法

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Also Published As

Publication number Publication date
WO1999035523A1 (fr) 1999-07-15
CA2317784A1 (fr) 1999-07-15
WO1999035523A8 (fr) 1999-09-16
JP2002501213A (ja) 2002-01-15
EP1060427A4 (fr) 2006-01-25
KR20010033934A (ko) 2001-04-25

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