摘要:
A light demultiplexer in which a signal and a noise in each channel may be distinctly separated is provided. The light demultiplexer comprises a light-receiving element array for receiving light beams demultiplexed every wavelength from a wavelength multiplexed light beam and arranged in a straight line. The light-receiving element array includes a plurality of light-receiving elements for monitoring signals, and a plurality of light-receiving elements for monitoring noises. The light-receiving elements for monitoring signals and the light-receiving elements for monitoring noise are alternately arrayed in a straight line the direction thereof is the same as that of the arrangement of the demultiplexed light beams.
摘要:
A light-receiving element array is provided in which the degradation of characteristic thereof due to the crosstalk may be prevented. An n-InP layer, an i-InGaAs layer, and an n-InP layer are stacked on an n-InP substrate. Zn is diffused into the topmost n-InP layer to form a p-type diffused region, resulting in a pin-photodiode. A passivation layer is deposited on the structure to a thickness such that a nonreflective condition is satisfied. On the passivation film, a light-shielding film is provided so as to cover the area between light-receiving elements.
摘要:
The present invention provides an epitaxially grown compound semiconductor film having a low density of crystal defects which are generated during the course of crystal growth of a compound semiconductor. The present invention also provides a compound semiconductor multi-layer structure including an n-type InP substrate, an n-type InP buffer layer, an undoped InGaAs light-absorbing layer, and an n-type InP cap layer, the layers being successively grown on the substrate through MOCVD. In the InGaAs layer, the compositional ratio of In/Ga is cyclically varied in a thickness direction (cyclic intervals: 80 nm) so as to fall within a range of ±2% with respect to a predetermined compositional ratio that establishes lattice matching between InGaAs and InP; specifically, within a range between 0.54/0.46 (i.e., In0.54Ga0.46As) and 0.52/0.48 (i.e., In0.52Ga0.48As)
摘要:
Concave parts arranged with a predetermined pattern on the surface of a plate substrate is formed. Wettability of the concave part surface is made to differ from that of the surface of a flat part between the concave parts. Particularly, in the case of an aqueous liquid, by forming water repellency film on the flat part, liquid can be stably retained on the concave part and prevented from spilling over to the adjacent concave part.
摘要:
An optical module according to the invention can achieve an optical system using a transmission-type diffraction grating for bending the optical path of incident light with a specific wavelength by about 90°. A substrate of the transmission-type diffraction grating is mounted at an angle in a range of +5° with respect to the design incident angle α of the incident light. The optical system can be applied to a light multiplexing/demultiplexing module.
摘要:
An optical module can achieve an optical system using a transmission-type diffraction grating for bending the optical path of incident light with a specific wavelength by about 90°. A substrate of the transmission-type diffraction grating is mounted at an angle in a range of ±5° with respect to the design incident angle α of the incident light. The optical system can be applied to a light multiplexing/demultiplexing module.
摘要:
An optical module according to the invention can achieve an optical system using a transmission-type diffraction grating for bending the optical path of incident light with a specific wavelength by about 90°. A substrate of the transmission-type diffraction grating is mounted at an angle in a range of ±5° with respect to the design incident angle α of the incident light. The optical system can be applied to a light multiplexing/demultiplexing module.
摘要:
A masking pattern is performed on a substrate by using materials that are weakly adhered to the substrate, and then the masked substrate is etched. Since the mask is weakly adhered to the substrate, the mask is peeled off from the surface of the substrate, so that a gap is generated between the mask and the substrate, and then anisotropic etching is performed. According to this method, it is possible to easily manufacture an optical measurement substrate having recesses whose sectional shape can be approximated to a curve having inflection points. Therefore, optical characteristics of a minute amount of substances can be evaluated efficiently without the loss of incident and reflected light even when measuring light is incident at an angle of less than 45 degrees.