Abstract:
A semiconductor optical device includes a first mode converting core, a light amplification core, a second mode converting core, and a light modulation core disposed in a first mode converting region, a light amplification region, a second mode converting region, and a light modulating region of a semiconductor substrate, respectively, and a current blocking section covering at least sidewalls and a top surface of the light amplification core. The first mode converting core, the light amplification core, the second mode converting core, and the light modulation core are arranged along one direction in the order named, and are connected to each other in butt joints. The current blocking section includes first, second, and third cladding patterns sequentially stacked. The second cladding pattern is doped with dopants of a first conductivity type, and the first and third cladding patterns are doped with dopants of a second conductivity type.
Abstract:
Disclosed are an optical waveguide platform with integrated active transmission device and monitoring photodiode. The optical waveguide platform with hybrid integrated optical transmission device and optical active device includes an optical waveguide region formed by stacking a lower cladding layer, a core layer and an upper cladding layer on a substrate; a trench region formed by etching a portion of the optical waveguide region; and a spot expanding region formed on the core layer in the optical waveguide region, in which the optical transmission device is mounted in the trench region and the optical active device is flip-chip bonded to the spot expanding region. The monitoring photodiode is flip-chip bonded to the spot expanding region of the core layer of the optical waveguide, thereby monitoring output light including an optical coupling loss that occurs during flip-chip bonding.
Abstract:
Disclosed is a multi-channel receiver optical sub assembly. The a multi-channel receiver optical sub assembly includes: a multi-channel PD array, in which a plurality of photodiodes (PDs) disposed on a first capacitor, and including receiving areas disposed at centers thereof and anode electrode pads arranged in an opposite direction at an angle of 180 degrees based on the receiving areas between the adjacent PDs is monolithically integrated; a plurality of transimpedance amplifiers (TIAs) arranged on a plurality of second capacitors, respectively, and connected with the anode pads of the respective PDs through wire bonding; a submount on which the first capacitor.
Abstract:
Disclosed is a multi-channel receiver optical sub assembly. The a multi-channel receiver optical sub assembly includes: a multi-channel PD array, in which a plurality of photodiodes (PDs) disposed on a first capacitor, and including receiving areas disposed at centers thereof and anode electrode pads arranged in an opposite direction at an angle of 180 degrees based on the receiving areas between the adjacent PDs is monolithically integrated; a plurality of transimpedance amplifiers (TIAs) arranged on a plurality of second capacitors, respectively, and connected with the anode pads of the respective PDs through wire bonding; a submount on which the first capacitor.
Abstract:
A wavelength-tunable external cavity laser generating device is provided. The wavelength-tunable external cavity laser generating device includes a reflection-type multi-mode interferometer, an optical amplifier disposed between the reflection-type multi-mode interferometer and an external wavelength-tunable reflector to amplify light, and an optical signal processor configured to process light from the reflection-type multi-mode interferometer. The reflection-type multi-mode interferometer includes a multi-mode waveguide, an input waveguide connecting the optical amplifier and one end of the multi-mode waveguide, and an output waveguide configured to connect the optical signal processor and the other end of the multi-mode waveguide.
Abstract:
A nonlinear Y-junction waveguide structure includes a straight linear waveguide, and a nonlinear waveguide partially joined to the linear waveguide and bent through a desired angle at an output end portion thereof, whereby incident light coming into the linear waveguide travels mainly along the linear waveguide when it has a power lower than a predetermined level while traveling mainly along the nonlinear waveguide when it has a power not lower than the predetermined level. The nonlinear Y-junction waveguide structure has an increased branching angle as compared to the conventional completely-operating optical device and exhibits an abrupt switching phenomenon. Accordingly, it is possible to achieve an easy adjustment of the critical power. In this regard, there is no difficulty in the fabrication of the waveguide structure.
Abstract:
The present invention provides to a novel grating-assisted directional coupler which is capable of appending a nonlinear thin film to a conventional linear grating-assisted directional coupler, to thereby significantly improve coupling efficiency and hence design a structure having optical multistable characteristics, which comprises; a thin film nonlinear optical waveguide with third-order nonlinearity, which having a first thickness; a first linear optical waveguide formed on the thin film nonlinear optical waveguide, which having a second thickness, wherein a linear refractive index of the first linear optical waveguide is more than that of the thin film nonlinear optical waveguide; an optical waveguide grating patterned in equi-distanced on top surface of the nonlinear optical waveguide; and a second optical waveguide formed at a portion which is displaced from top surface of the first linear optical waveguide by a predetermined distance.
Abstract:
A wavelength division demultiplexing device, and a system using the device are disclosed, in which there is utilized a Pabry-Perot etalon using as a spacer layer a Kerr medium in which the refractive index is varied in accordance with the intensity of beams. The wavelength division demultiplexing device according to the present invention includes: a substrate; a first mirror layer formed on the substrate, and consisting of an alternately repeating medium used as a bottom mirror layer; a second mirror layer consisting of an alternating repeating stack of a high refractive index medium and a low refractive index medium used as a top mirror layer; and a spacer layer composed of a Kerr medium and disposed between the first mirror layer and the second mirror layer; wherein the reflectivity of the first mirror layer is higher than that of the second mirror layer; and the thickness of the spacer layer is set such that the value of the initial tuning phase of the spacer layer for the range of wavelengths of an incident beam is m.pi.+t.pi., where m represents an integer, and t represents 0.2-0.4.
Abstract translation:公开了一种波分解复用器件和使用该器件的系统,其中使用Pabry-Perot标准具作为间隔层使用克尔介质,其中折射率根据光束的强度而变化。 根据本发明的波分解复用器件包括:衬底; 形成在基板上的第一镜层,由用作底镜层的交替重复的介质构成; 由高折射率介质的交替重复堆叠和用作顶部镜面层的低折射率介质组成的第二镜面层; 以及由克尔介质组成并设置在第一镜层和第二镜层之间的间隔层; 其中所述第一镜层的反射率高于所述第二镜层的反射率; 并且间隔层的厚度被设定为使得入射光束的波长范围内的间隔层的初始调谐相位的值为m pi + t pi,其中m表示整数,t表示0.2-0.4 。
Abstract:
The present invention relates to a spot size converter and a method of fabricating the same, which provides efficient coupling between an optical fiber and integrated devices of optical waveguide. The spot size converter has an input and output optical waveguides formed in a vertical double-layer structure. Integrated to the output optical waveguide, an unidirectional side-tapered optical waveguide is formed. Due to the tapered structure of the optical waveguide, the effective refective index gradually changes along the length of the waveguide. Thus, the spot size of the optical signal gradually changes while the optical signal travels within the tapered optical waveguide. Therefore, the present invention effectively eliminates or minimizes the coupling loss and the reflection loss between the optical fiber and the devices connected to the spot size converter. In particular, the present invention provides method for easily fabricating a tapered and narrow optical waveguide structure using low-resolution photolithography technique and reducing the manufacturing cost and increasing the manufacturing yield at the same time.
Abstract:
A structure of optical grating slab waveguide including a light waveguiding layer with linear refractive index disposed on another waveguiding layer having a nonlinear refractive index. The refractive index of nonlinear waveguiding material is a function of intensity of optical power incident therein. The structure of this invention provides an optical waveguide having improved optically coupling coefficient. A optical grating structures formed with a slab waveguide of this invention may be used as a wavelength selective coupling device of bidirectional optical coupler that is particularly useful as demultiplexer or multiplexer.