摘要:
Disclosed is a wavelength multi/demultiplexer for separating two wavelength bands with a narrow wavelength spacing. A dielectric multilayer filter is provided in an intersection portion where two optical waveguides intersect each other and separates incident light to the dielectric multilayer filter to transmitted light and reflected light. Here, the distance X from the multilayer surface on the light-incident side of the dielectric multilayer to the central intersection point of the two intersecting optical waveguides is arranged to satisfy 0≦X≦d/2 (where “d” represents the thickness of the dielectric multilayer). With this configuration, a multi/demultiplexer can be realized that shows good wavelength response without spectral degradation even for two wavelengths having narrow wavelength spacing.
摘要翻译:公开了用于分离窄波长间隔的两个波长带的波长多路复用器。 在两个光波导彼此交叉的交叉部分中设置有电介质多层滤波器,将入射光分离到电介质多层滤波器以透射光和反射光。 这里,从电介质多层体的光入射侧的多层表面到两个相交的光波导的中心交点的距离X被设置为满足0 <= X <= d / 2(其中,“d”表示 电介质多层膜的厚度)。 利用这种配置,即使对于具有窄波长间隔的两个波长,也可以实现显示良好的波长响应而没有频谱衰减的多路分离器。
摘要:
Disclosed is a wavelength multi/demultiplexer for separating two wavelength bands with a narrow wavelength spacing. A dielectric multilayer filter is provided in an intersection portion where two optical waveguides intersect each other and separates incident light to the dielectric multilayer filter to transmitted light and reflected light. Here, the distance X from the multilayer surface on the light-incident side of the dielectric multilayer to the central intersection point of the two intersecting optical waveguides is arranged to satisfy 0≦X≦d/2 (where “d” represents the thickness of the dielectric multilayer). With this configuration, a multi/demultiplexer can be realized that shows good wavelength response without spectral degradation even for two wavelengths having narrow wavelength spacing.
摘要翻译:公开了用于分离窄波长间隔的两个波长带的波长多路复用器。 在两个光波导彼此交叉的交叉部分中设置有电介质多层滤波器,将入射光分离到电介质多层滤波器以透射光和反射光。 这里,从电介质多层体的光入射侧的多层表面到两个相交的光波导的中心交点的距离X被设置为满足0 <= X <= d / 2(其中,“d”表示 电介质多层膜的厚度)。 利用这种配置,即使对于具有窄波长间隔的两个波长,也可以实现显示良好的波长响应而没有频谱衰减的多路分离器。
摘要:
A planar lightwave circuit is provided. The planar lightwave circuit includes a waveguide and a spotsize converter which is a part of the waveguide, wherein a core is embedded in a cladding in the waveguide, and the spotsize converter is located near an end face of a substrate on which the planar lightwave circuit is formed, the spotsize converter including: a core width fine-tuning part in an end face side of the substrate; and a core width converting part which follows the core width fine-tuning part; wherein core width of the spotsize converter is minimum at an end face of the substrate, a mean taper angle θ1 of the core width fine-tuning part is larger than 0° and smaller than a mean taper angle θ2 of the core width converting part.
摘要:
A low-cost, high-reliability polarization-independent optical waveguide interferometer is proposed which does not bring about any additional job involved in the insertion of a half-wave plate or excess loss of light. In an optical multi/demultiplexer utilizing optical interference of light waves passing through a plurality of optical waveguides with different lengths, such as an AWG and a Mach-Zehnder interferometer, longitudinal integral values of birefringence values of the individual waveguides, which values are variable or invariable along the waveguides, are made equal for all waveguides 201 and 202. Thus, simply varying the waveguide width can implement polarization-independent operation, or on the contrary implement a polarization beam splitter. For example, the polarization-independent can be implemented by making the core widths, which are averaged in a longitudinal direction of a plurality of optical waveguides with different lengths, wider in a shorter optical waveguide, and narrower in a longer optical waveguide.
摘要:
The present invention provides an optical demultiplexer and an optical multiplexer the transmission characteristics of which are unlikely to be affected by fabrication errors and which have small group delay dispersion. A cross output port (X-OUT) of a second optical demultiplexer element (DEMUX) is selected, and a through output port (T-OUT) of a third DEMUX is selected. A T-OUT of a first DEMUX has a passband equal to the X-OUT of the second DEMUX, and a X-OUT of the first DEMUX has a passband equal to the T-OUT of the third DEMUX. The T-OUT of the first DEMUX has group delay characteristics opposite to those of the X-OUT of the second DEMUX, and the X-OUT of the first DEMUX has group delay characteristics opposite to those of the T-OUT of the third DEMUX.
摘要:
A no polarization dependent waveguide type optical circuit can resolve polarization dependency completely and can reduce reflected return light. An intermediate portion of the two connecting waveguides are formed with S-shaped waveguides of the same shape consisted of respectively two curved waveguides or two curved waveguides and straight waveguides connecting the curved waveguides. One polarization mode converter is provided in a groove formed across the S-shaped waveguide, and a perpendicular line to an incident surface of light of the polarization mode converter and the S-shaped waveguide forms an angle greater than 0°.
摘要:
An arrayed waveguide grating type optical multiplexer/demultiplexer circuit in which wavelength dispersion is reduced. An input wave guide (1), a first slab waveguide (2), an arrayed waveguide (3), a second slab waveguide (4) and an output waveguide (5) are connected sequentially. Furthermore, a parabola waveguide (6) is provided between the input waveguide (1) and the first slab waveguide (2), and a taper waveguide (7) is provided between the second slab waveguide (4) and the output waveguide (5). A parabola waveguide length Z0 exists in a range Za,0=Z0=Zp,0 determined by a parabola waveguide length Za,0 where the ratio of absolute amplitude between the main peak and the first side peak in the field distribution of far-field of the parabola waveguide (6) has an upper limit of 0.217, and a parabola waveguide length Zp,0 where the relative phase of the main peak and the first side peak in the field distribution of far-field has a lower limit of 3.14 radian.
摘要翻译:波长分散减小的阵列波导光栅类型的光信号多路复用器/多路分离器电路。 依次连接输入波导(1),第一平板波导(2),阵列波导(3),第二平板波导(4)和输出波导(5)。 此外,在输入波导(1)和第一平板波导(2)之间设置有抛物线波导(6),在第二平板波导(4)和输出波导(5)之间设置锥形波导(7) 。 抛物线波导长度Z 0存在于范围Z a a 0,Z 0,Z 0,Z 0,...,Z 0, 由抛物线波导长度Z a a 0确定,其中抛物线波导(6)的远场的主峰和第一侧峰之间的绝对幅度的比值具有上 极限为0.217,抛物线波导长度Z
摘要:
It is an object of the present invention to reduce the size of a circuit and the adverse effects of fabrication errors, while increasing yield. Signal light incident on a circuit through input waveguides propagates from the exterior to interior of the circuit while rotating counterclockwise. The signal light passes through a point of inflection in the center of the circuit, subsequently propagate clockwise from the interior to exterior of the circuit, and then exit output waveguides. Two arms constituting a delay circuit and optical couplers can be integrated together at such an interval that they are not coupled together. Therefore, the size of the circuit can be reduced compared to the prior art.
摘要:
The present invention provides a throating that enables temporary affixing and facilitates construction work.The throating of the present invention includes a rear plate part that is fixed to a building frame, a throating plate part bent obliquely downward and frontward at a lower end of the rear plate part, and a front plate part bent downward from a front end of the throating plate part. The throating has an adhesive layer on each of a front face and a rear face of the rear plate part, and has a release paper on the surface of the adhesive layers. A top end portion of the rear plate part is covered by an adhesive layer and/or release paper. Preferably, the release paper has a cutting line.
摘要:
A wood cement board having on a surface thereof a rugged pattern has a plurality of layers laminated each having a cement, a silica-containing material, wood fibers and wood flour, wherein the cement and the silica-containing material are contained at a weight ratio ranging from 3:7 to 7:3, the wood flour ranges in size from 0.3 to 1.5 mm and is covered with calcium, and the amount of the wood fibers and the wood flour is not greater than 9 wt % with respect to total solids. Also provided is a method of producing a wood cement board, comprising the steps of covering wood flour ranging in size from 0.3 to 1.5 mm with calcium by mixing the wood flour with a cement composition, or with a cement, or with water resulting from dewatering a slurry, and stirring the mixture in water at a predetermined solids concentration; producing a slurry; producing a laminated mat; and pressing the mat at a pressure not higher than 10 MPa in use of a press, forming thereby a rugged pattern and performing curing.