CN113777704B - Dispersion compensation waveguide - Google Patents
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- CN113777704B CN113777704B CN202110882605.8A CN202110882605A CN113777704B CN 113777704 B CN113777704 B CN 113777704B CN 202110882605 A CN202110882605 A CN 202110882605A CN 113777704 B CN113777704 B CN 113777704B
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- 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
- G02B6/12004—Combinations of two or more optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- 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
- G02B6/13—Integrated optical circuits characterised by the manufacturing method
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Abstract
The invention discloses a dispersion compensation waveguide, which comprises a central waveguide serving as a substrate and dispersion compensation units at two sides; the dispersion compensation unit is formed by stacking multiple layers of waveguides with different refractive indexes and different sizes. Incident light with different wavelengths is incident to the central waveguide at different angles, so that different optical paths exist in the dispersion compensation waveguide; however, the total reflection times in the waveguide are the same, and the incidence points of the light with different wavelengths entering the central waveguide after the total reflection is completed are the same, so that the non-dispersive transmission is realized. The dispersion compensation waveguide has the advantages of no additional increase of the axial dimension of the waveguide, small additional radial dimension, low preparation cost, easy combination with a pupil expansion structure to enlarge the range of the orbit of the human eye and the total light-emitting area, and the like, and the waveguide structure has the characteristics of light weight, thinness and high transmittance, and can be applied to enhancement display wearable equipment (such as augmented reality near-eye display equipment and the like).
Description
Technical Field
The invention relates to the field of light and image transmission, in particular to a dispersion compensation waveguide which can be applied to the fields of wearable equipment, communication, sensing and the like.
Background
The waveguide is a common structure for guiding electromagnetic wave transmission in a directional way, and has wide application in the fields of wearable equipment, photoelectric communication, sensing detection and the like. Limiting the transmission of light rays in a waveguide structure requires that the total reflection condition of the light rays be met, i.e. the refractive index of the waveguide structure is larger than the refractive index of the surrounding medium and the angle of incidence is larger than the critical angle. At present, loss, dispersion and nonlinear effects of the waveguide are main constraint factors that prevent the waveguide from improving transmission performance. The monochromatic light with different wavelengths can have the conditions of total reflection times, different transmission paths and different transmission speeds in a single-layer waveguide structure, so that the pulse is widened and the signal is distorted, the error rate and the inter-code crosstalk of the system are further increased, and the communication capacity of the system is reduced.
The current state-of-the-art dispersion compensation technology is optical-based dispersion compensation technology. By designing the relevant optical compensation element, it is added to the transmission path of the light to achieve compensation of chromatic dispersion. The main optical compensation elements include dispersion compensation optical waveguide and chirped fiber grating. In recent years, newer technologies continue to emerge, including but not limited to electrical dispersion compensation techniques, coherent detection techniques based on digital signal processing, and the like.
With the widespread use of augmented reality technology, a waveguide structure is an indispensable component of consumer-grade augmented reality wearable devices (such as an augmented reality near-eye display device). In a single-layer waveguide structure, light with different wavelengths enters at the same point at the same incident angle, and refraction angles with different magnitudes can be generated due to different wavelengths, so that the total reflection times and transmission paths in the waveguide structure are different, and then the positions of exit points when the light leaves the waveguide are also different. The positions of light emergent points with different wavelengths are distributed along the axis, so that a rainbow phenomenon with uneven color proportion in the axis is generated, and the imaging effect of an image is affected.
Therefore, how to implement dispersion compensation of the waveguide structure of the augmented reality wearable device is a problem that needs to be solved by device developers.
Disclosure of Invention
The invention provides a dispersion compensation waveguide which has a simple structure, does not increase the axial length of the waveguide, and can avoid the rainbow effect during light transmission.
The dispersion compensation waveguide of the present invention is composed of a central waveguide and a dispersion compensation unit. On both sides of the central waveguide, dispersion compensating units distributed along the axial direction in discrete or continuous form a dispersion compensating structure. A single dispersion compensating unit is formed by stacking one or more layers of compensating waveguides, and the number, refractive index and size of the compensating waveguides are matched with corresponding incident light.
When in use, the dispersion compensating waveguide of the present invention can be combined with a mydriatic structure to increase the range of the orbit to fit more people. The dispersion compensation waveguide can be applied to wearable equipment such as augmented reality near-eye display equipment and the like due to the characteristics of light weight, thinness and high penetrability of the waveguide structure, and can realize the basic function of transmitting images to human eyes from a side-placed imaging system, and the additional functions of reducing dispersion, reducing rainbow effect and the like.
In the invention, the dispersion compensation units can be arranged on two sides of the central waveguide continuously or at intervals.
In the case of the interval arrangement, as an alternative, in the single dispersion compensation unit, the multilayer compensation waveguides are distributed in a waveguide stack, wherein the refractive index, the axial dimension and the radial dimension of the waveguide stack gradually decrease from inside to outside. Of course, the axial dimensions of the multilayer compensating waveguides in the dispersion compensating unit may also be the same.
In the present invention, the term "axial direction" generally refers to a direction of a central axis of the central waveguide or a direction parallel to the central axis. The term "radial" generally refers to a direction perpendicular to the "axial" direction described above, i.e., a dimension perpendicular to the axis of the waveguide, i.e., the thickness dimension of the waveguide.
Preferably, the dispersion compensating units on the same side are arranged at equal intervals when arranged at intervals.
As a further preference, the dispersion compensating units on both sides are arranged at the same pitch.
All incident light rays enter the central waveguide from the same point and the same plane; then re-enters the central waveguide from the same point after passing through the corresponding dispersion compensation unit, and propagates forward in the central waveguide.
Preferably, the number of dispersion compensating waveguides in each dispersion compensating unit is 1 to 5.
Preferably, the axial dimension of the central waveguide is 3-20cm, which is equivalent to the width of the augmented reality near-eye display device; the radial dimension is 0.5-5mm, which is equivalent to the thickness of the lens of the augmented reality near-eye display device.
When a plurality of dispersion compensating units are arranged at intervals, the axial dimension of each dispersion compensating unit is preferably 10-400 mu m, and is determined by the innermost waveguide which is nearest to the central waveguide and has the largest dimension in the dispersion compensating units; the radial dimension is 5-200 μm, which is related to the number of waveguide layers of the dispersion compensating unit, which are determined by the wavelength range of light transmitted within the dispersion compensating waveguide.
The maximum axial dimension of the dispersion compensation unit is not strictly required, and even if a continuous structure is adopted, the requirement of the invention can be met. If a spacing arrangement is used, the minimum axial dimension of the dispersion compensating unit is limited by the dimension of the innermost compensating waveguide, which is required to meet the refractive requirements of the incident light rays with the minimum wavelength.
For the non-outermost compensating waveguide, one beam of incident light is total reflection light, the other beams are transmission light (refraction), and the minimum size of the non-outermost compensating waveguide is required to meet the total reflection requirement of the total reflection light and the incidence/refraction requirement of the transmission light.
The axial dimension and the radial dimension of each layer of waveguide in the dispersion compensation unit can also be set differently. In the single dispersion compensation unit, the closest central waveguide is the innermost compensation waveguide, the size of the innermost compensation waveguide is the largest, the axial size is 10-400 mu m, and the radial size is 5-200 mu m; the outermost compensating waveguide is the outermost compensating waveguide, the outermost compensating waveguide has the smallest dimension, the axial dimension is 1-100 μm, and the radial dimension is 0.5-30 μm. Of course, the terms "maximum" and "minimum" refer to the critical values, and the actual axial dimensions may be equal or unequal if the critical values are satisfied.
The dispersion compensation units are periodically distributed on two sides of the central waveguide. On one side of the boundary of the central waveguide, the axial interval of the dispersion compensation units is 0.2-8mm; when the equal-spacing arrangement is adopted, the dispersion compensation units are exactly arranged on the opposite sides of the middle point of the connecting line of the adjacent dispersion compensation units positioned on one side of the central waveguide. The parameters of the number of waveguide layers, the axial and radial dimensions of each layer of waveguide, the refractive index of each layer of waveguide, the total axial and vertical axis dimensions and the like of each dispersion compensation unit are completely the same.
Preferably, the overall size, composition and material of each dispersion compensation unit are the same.
As the central waveguide and the dispersion compensating structure, titanium oxide, tantalum oxide, hafnium oxide, niobium oxide, zirconium oxide, etc., nitride material silicon nitride, etc., sulfide material zinc sulfide, etc., macromolecular polymer material and its derivative aromatic polyimide, polyurethane resin (MR series), etc. which are high refractive index metal oxide materials can be generally used.
The compensating waveguide of the invention can be prepared by adopting a micro-nano processing technology.
In practical design, a specific dispersion compensation unit can be designed according to different wavelengths of light rays transmitted or collected as required. If n light rays with different wavelengths need to be transmitted in the waveguide, n-1 compensating waveguides are needed to ensure that the propagation path of each light ray is different and the waveguide with total reflection is different; however, in practical application, the number of incident light is generally not more than 3; for example, when the waveguide is applied to optical imaging, the transmitted light rays can be three primary colors of red, green and blue (RGB).
Taking three incident light beams as an example, the design concept of the present invention is as follows, and referring to fig. 3:
(1) Taking three incident light rays as an example: the wavelengths of three incident light rays (such as red, green and blue) are known, the incident angles of the incident light rays from the outside air to the central waveguide are the same, and the light rays respectively have a deflection angle theta after the deflection action of the blazed grating-like waveguide at the edge a 、θ b 、θ c Enters the central waveguide, and the refraction angle theta is caused by the different wavelengths of the three light beams a 、θ b 、θ c Different.
(2) Three beams of light, we need two layers of compensating waveguides, respectively defined as an inner compensating waveguide (disposed near the center waveguide) and an outer compensating waveguide. In designing the structural parameters, we define the radial dimension of the compensating waveguide to be a series of fixed values (i.e., d 11 ，d 121 ，d 122 All constant), from the incident angle theta a 、θ b 、θ c And total reflection occurs only for the incident light a (red light) with the largest wavelength at the boundary surface of the central waveguide and the inner compensating waveguide, thereby determining the refractive index n of the inner compensating waveguide 121 121 The method comprises the steps of carrying out a first treatment on the surface of the Angle of refraction θ of incident light a, c (red, blue) a 、θ c And width d of central waveguide 11 The positions of A and B can be determined, and the critical axial dimension of the inner compensating waveguide can be determined from the position of A, B (i.e., a 121 )；
(3) Similarly, at the boundary surface of the inner and outer compensating waveguides, the refractive index n of the outer compensating waveguide 122 can be determined by total reflection of ray b (green light) and transmission of ray c (blue light) 122 The method comprises the steps of carrying out a first treatment on the surface of the Angle of refraction θ of rays b, c (green, blue) b ′、θ c ' and the width d of the inner compensating waveguide 121 The positions of D and E can be determined from the position of D, E pointsThe critical axial dimension (i.e., a) of the outer compensating waveguide 122 is determined 122 )。
Unlike traditional optical dispersion compensating technology, which adds dispersion compensating optical waveguide or chirped fiber grating in the axial direction of waveguide, the dispersion compensating waveguide is prepared by micro-nano process and multilayer compensating waveguide is added in the radial direction of central waveguide. Incident light of different wavelengths is incident to the central waveguide at different angles and has different optical paths. However, the dispersion compensation waveguide of the invention realizes the increase of the transmission distance of short wavelength light along the axis, so that the light rays with different wavelengths have the same total reflection times; and the total reflection position of the long wavelength light is controlled to be the same as the incidence point of the short wavelength light transmitted from the dispersion compensation waveguide into the central waveguide, so that the function of dispersion compensation is realized, and the axial dimension of the central waveguide is not additionally increased. Meanwhile, the waveguide structure does not perform processes such as 'zooming' on an image when the image is transmitted, and is an independent element which is completely independent of the imaging system, so that when the waveguide is selected as a transmission channel of the near-eye display device, the side placement of the display screen and the imaging system can be realized, the blocking of the optical element to external light is reduced, the weight distribution, the appearance and the structure of the device are optimized, and the wearing comfort of a user is improved. The dispersion compensation waveguide has small additional radial dimension and low preparation cost, can be combined with a pupil expansion structure, can enlarge the orbit moving range and the total light emitting area of human eyes when being applied to the augmented reality near-eye display equipment, is suitable for users with different interpupillary distances, has the characteristics of light weight, thinness and high transmittance, and can be applied to the augmented display wearable equipment (such as the augmented reality near-eye display equipment and the like).
Drawings
FIG. 1 is a schematic diagram of a dispersion compensating waveguide according to the present invention;
FIG. 2 is a schematic representation of the propagation of multiple monochromatic light beams of different wavelengths in the present invention;
FIG. 3 is a schematic diagram showing the propagation of multiple monochromatic light beams of different wavelengths in a central waveguide and a single critical-size dispersion compensation unit;
fig. 4 is a schematic diagram showing that monochromatic light obliquely incident to a central waveguide after passing through an entrance pupil and the like beam deflector is transmitted and combined with a certain pupil expansion structure in the present invention.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, it being noted that the examples described below are intended to facilitate an understanding of the invention and are not intended to limit the invention in any way.
As shown in fig. 1, the dispersion compensating waveguide of the present invention is composed of a multilayer waveguide structure, and mainly comprises a central waveguide as a substrate and a dispersion compensating structure of a stack of discrete distributions on both sides of the central waveguide.
Wherein, the propagation paths of a plurality of light rays with different wavelengths in the invention are as shown in fig. 2:
(1) The central waveguide 11 has an axial dimension of cm and a radial dimension of mm, the dispersion compensating unit 12 is composed of off-axis compensating waveguides 121, 122 of 100 μm in radial dimension, and the dispersion compensating unit 13 is composed of off-axis compensating waveguides 131, 132 of 100 μm in radial dimension.
(2) The dispersion compensation units 12 and 13 are distributed on the same side interface of the central waveguide 11, and the dispersion compensation units are distributed at equal intervals and discrete on the side variable interface; the dispersion compensation units 14 are arranged on the center line of the connection line of the dispersion compensation units 12 and 13 and the boundary surface of the other side of the central waveguide 11, the dispersion compensation units on the opposite side are also distributed in an equidistant and discrete manner, and the interval between the dispersion compensation units is equal to the interval between the dispersion compensation units 12 and 13; the dispersion compensating units 12, 13, 14 are identical in structure.
(3) The refractive index relationship of the central waveguide 11, the compensating waveguide 121 and the compensating waveguide 122 is n 11 ＞n 121 ＞n 122 (n 11 Refractive index n of central waveguide 11 121 To compensate for the refractive index, n, of waveguide 121 122 To compensate for the refractive index of waveguide 122); in this embodiment, a, b, and c are incident light rays with different wavelengths, enter the dispersion compensating waveguide at the same incident point O with the same plane of different incident angles, and have a wavelength relationship of λ a ＞λ b ＞λ c (λ a Is light ray aWavelength lambda of (a) b Is the wavelength lambda of the light b c The wavelength of ray c), the incident angle relationship satisfies θ a ＞θ b ＞θ c (θ a Is the incident angle theta of the light ray a b Is the incident angle theta of the light ray b c Is the angle of incidence of ray c).
(4) The light a having a longer wavelength satisfies the total reflection condition at the interface of the center waveguide 11 and the compensation waveguide 121, so that the total reflection is transmitted forward only in the center waveguide 11; the light b with smaller wavelength is transmitted at the interface of the central waveguide 11 and the compensating waveguide 121, and is transmitted into the central waveguide 11 again after being totally reflected at the interface of the compensating waveguide 121 and the compensating waveguide 122, so that the light b is transmitted only in the central waveguide 11 and the compensating waveguide 121; the light c having a smaller wavelength is transmitted at the interface between the central waveguide 11 and the compensating waveguide 121 and at the interface between the compensating waveguide 121 and the compensating waveguide 122, and is transmitted again into the central waveguide 11 after being totally reflected at the boundary surface between the compensating waveguide 122, so that it can be transmitted through the central waveguide 11, the compensating waveguide 121 and the compensating waveguide 122. After transmission in a dispersion compensation unit, the positions of light rays b, c transmitted into the central waveguide 11 are the same as the positions of light ray a where total reflection occurs, which are both points a, so that dispersion compensation in a single periodic structure can be achieved.
As shown in fig. 3, the radial dimension d of the central waveguide 11 is 11 The compensating waveguide 121 has a radial dimension d 121 And the radial dimensions of the central waveguide and the compensating waveguide 121 are constant values. At the interface of the central waveguide 11 and the compensating waveguide 121, the light ray a satisfies: n is n 1 sinθ a ≥n 121 I.e. θ a Greater than or equal to the critical angle for total reflection, so that ray a undergoes total reflection; the light ray b satisfies: n is n 1 sinθ b ＜n 121 I.e. θ b Less than the critical angle for total reflection, so that ray b is transmitted into the dispersion compensation unit; the light ray c satisfies: n is n 1 sinθ c ＜n 121 I.e. θ c Less than the critical angle for total reflection, and thus light ray c is transmitted into the dispersion compensating structure.
Axial dimension a of compensating waveguide 121 121 Can be adjusted according to the requirement, and the critical axial directionThe dimensions (i.e., minimum axial dimensions) are as shown, satisfying: a, a 121 (min)＝d 11 (tanθ a -tanθ c ). The left end face AA' of the compensating waveguide 121 may be shifted leftwards, but not rightwards, so as to limit the position of total reflection of the light ray a (the position of the light rays b and c transmitted out of the compensating waveguide 121) on the interface between the central waveguide 11 and the compensating waveguide 121, so that the following conditions are satisfied: AC is greater than or equal to d 11 tanθ a The method comprises the steps of carrying out a first treatment on the surface of the The right end face BB' of the compensating waveguide 121 may be shifted right, but not left, so as to limit the incidence point of the light ray c transmitted into the dispersion compensating unit on the interface between the central waveguide 11 and the compensating waveguide 121, so as to satisfy the following conditions: BC is less than or equal to d 11 tanθ c . Axial dimension a of compensating waveguide 121 121 The following should be satisfied: a, a 121 ≥d 11 (tanθ a -tanθ c )。
Axial dimension a of compensating waveguide 122 122 The critical axial dimension (i.e. the minimum axial dimension) can also be adjusted as required, as shown in the figure, so that the following conditions are satisfied: a, a 122 (min)＝2d 122 sinθ c ". The left end face DD 'of the compensating waveguide 122 can translate leftwards and not rightwards so as to limit the position of the light ray c transmitted out of the compensating waveguide 122 to be on the interface between the compensating waveguide 121 and the compensating waveguide 122, thereby meeting the requirement that DB'. Gtoreq.2d 122 sinθ c ″+d 121 tanθ c 'A'; the right end face EE' of the waveguide 122 can be shifted right, but not left, so as to limit the incidence point of the light ray c transmitted into the compensating waveguide 122 on the interface between the compensating waveguide 121 and the compensating waveguide 122, so that the following conditions are satisfied: EF is less than or equal to d 121 tanθ c '. Axial dimension a of compensating waveguide 122 122 The following should be satisfied: a, a 122 ≥2d 122 sinθ c ″。
As shown in fig. 4, light rays with different wavelengths obliquely incident to the central waveguide after passing through the beam deflector such as the entrance pupil are schematically transmitted in the dispersion compensating waveguide of the present invention and combined with a certain pupil expansion structure. Wherein: the central waveguide 11 has an axial dimension of cm and a radial dimension of mm, and the off-axis compensating waveguides 121 and 122 have a radial dimension of 100 μm; the radial dimension of the pupil expanding structure is 200nm level; the wavelength relation of the light rays a, b and c is as follows: lambda (lambda) a ＞λ b ＞λ c The method comprises the steps of carrying out a first treatment on the surface of the The pupil expansion structures 41, 42, 43 are respectively located at boundary surfaces of the central waveguide 11 and the compensating waveguides 121, 122 (only one of the structures is arranged in this way), and can respectively perform axial beam expansion and beam splitting on the light rays a, b, c transmitted in the waveguides, so that the total field angle of view, the orbit moving range of a human eye and the light emitting area of a light field are increased, the pupil expansion device is suitable for users with different pupil distances, and the visual effect can be enhanced.
Description of the preferred embodiments
As shown in fig. 3, the light rays a, b, c transmitted in the waveguide are red light having a wavelength of 650nm, green light having a wavelength of 550nm, and blue light having a wavelength of 450nm, respectively. The central waveguide 11 and the compensating waveguides 121 and 122 are respectively made of titanium oxide, silicon nitride, or aluminum oxide having refractive indexes of 2.30, 2.00, or 1.70. Red light, green light and blue light enter the central waveguide 11 at incident angles of 65 °, 55 °, 45 °, respectively.
At the interface of the central waveguide 11 and the compensating waveguide 121, the critical angle for total reflection occurs:the red light satisfies the total reflection condition and total reflection occurs at the point a; the green light and blue light do not meet the total reflection condition, and are transmitted into the compensating waveguide 121 in the dispersion compensating unit by the central waveguide. The refraction angle satisfies:
at the interface of the compensating waveguide 121 and the compensating waveguide 122, the critical angle for total reflection occurs:the green light satisfies the total reflection condition and is transmitted into the central waveguide 11 from the point a after total reflection at the interface of the compensating waveguide 121 and the compensating waveguide 122; blue light does not satisfy the total reflection condition and is transmitted by the compensating waveguide 121Into the compensation waveguide 122, the refraction angle satisfies:
at the boundary surface of waveguide 122 with air, the critical angle for total reflection occurs: the blue light satisfies the total reflection condition and propagates in the waveguides 121 and 122 after total reflection at the interface of the waveguide 122 and air, and is transmitted by the dispersion compensating structure into the central waveguide 11 at point a.
It can be seen that after passing through the dispersion compensation unit, the transmission distance of blue light (450 nm) and green light (550 nm) with shorter wavelength along the axis is increased, and the dispersion compensation structure can control the total reflection position of red light (650 nm) of long wavelength light at the boundary of the central waveguide to be the same as the incident point of blue light and green light with short wavelength (both are point A) transmitted into the central waveguide from the dispersion compensation structure, thereby realizing dispersion compensation.
Claims (9)
1. The dispersion compensation waveguide comprises a central waveguide and is characterized by further comprising dispersion compensation units which are arranged on two sides of the central waveguide continuously or at intervals, wherein the dispersion compensation units are formed by superposing one or more layers of compensation waveguides with different refractive indexes; the number, refractive index and size of the compensating waveguides in each dispersion compensating unit are matched with the corresponding incident light; all incident light rays enter the central waveguide from the same point and the same plane; then enters the central waveguide from the same point after passing through the corresponding dispersion compensation unit, and propagates forward in the central waveguide.
2. The dispersion compensating waveguide according to claim 1, wherein the dispersion compensating units on the same side are arranged at equal intervals when arranged at intervals.
3. The dispersion compensating waveguide according to claim 2, wherein the dispersion compensating units on both sides are arranged at the same pitch.
4. The dispersion compensating waveguide according to claim 1, wherein the number of compensating waveguides in each dispersion compensating unit is 1 to 5.
5. The dispersion compensating waveguide of claim 1 wherein the axial dimension of the central waveguide is 3-20cm; the radial dimension is 0.5-5mm.
6. The dispersion compensating waveguide of claim 1 wherein the axial dimension of the individual dispersion compensating elements is 10-400 μm; the radial dimension is 5-200 μm.
7. The dispersion compensating waveguide according to claim 1, wherein the compensating waveguide closest to the central waveguide in the single dispersion compensating unit is an innermost waveguide having an axial dimension of 10-400 μm and a radial dimension of 5-200 μm; the axial dimension of the outermost compensating waveguide is 1-100 μm, and the radial dimension is 0.5-30 μm.
8. The dispersion compensating waveguide of claim 1 wherein the axial spacing of adjacent two dispersion compensating elements is 0.2-8mm.
9. The dispersion compensating waveguide of claim 1 wherein each dispersion compensating element is the same size, composition, material.
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| CN101952755A (en) * | 2008-02-29 | 2011-01-19 | 株式会社藤仓 | Substrate type light waveguide element, wavelength dispersion compensating element, optical filter, optical resonator and method for designing the light waveguide element, the wavelength dispersion compensating element, the filter and the resonator |
| CN104143762A (en) * | 2013-05-09 | 2014-11-12 | 索尼公司 | Semiconductor-laser-device assembly |
| CN108415122A (en) * | 2018-01-27 | 2018-08-17 | 天津大学 | A kind of control waveguide of wide band dispersion and control method |
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| US6947633B2 (en) * | 2002-10-28 | 2005-09-20 | Optovia Corporation | Dispersion compensation |
| US8649099B2 (en) * | 2010-09-13 | 2014-02-11 | Vuzix Corporation | Prismatic multiple waveguide for near-eye display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101952755A (en) * | 2008-02-29 | 2011-01-19 | 株式会社藤仓 | Substrate type light waveguide element, wavelength dispersion compensating element, optical filter, optical resonator and method for designing the light waveguide element, the wavelength dispersion compensating element, the filter and the resonator |
| CN104143762A (en) * | 2013-05-09 | 2014-11-12 | 索尼公司 | Semiconductor-laser-device assembly |
| CN108415122A (en) * | 2018-01-27 | 2018-08-17 | 天津大学 | A kind of control waveguide of wide band dispersion and control method |
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