65results about How to "Improve Optical Reliability" patented technology

The present invention provides a transparent inorganic oxide dispersion which makes it possible to improve the refractive index and mechanical characteristics and to maintain transparency by modifying the surface of inorganic oxide particles with a surface modifier having one or more reactive functional groups; and an inorganic oxide particle-containing resin composition in which the transparent inorganic oxide dispersion and a resin are compositely integrated by the polymerization reaction, a composition for sealing a light emitting element, a light emitting element, and a method for producing an inorganic oxide particle-containing resin composition; and a hard coat film which has high transparency and makes it possible to improve a refractive index and tenacity, an optical functional film, an optical lens and an optical component. The transparent inorganic oxide dispersion of the present invention comprises inorganic oxide particles which have a surface modified with a surface modifier having one or more reactive functional groups and have a disperse particle diameter of 1 nm or more and 20 nm or less, and a disperse medium, wherein the surface modifier is one or more kinds selected from the group consisting of a silane coupling agent, a modified silicone, and a surfactant.

The present invention provides an optical networking device for re-amplifying, re-shaping, and re-timing an optical signal, as well as providing distortion compensation and performance monitoring of the optical signal. The optical networking device includes an all-optical regenerator device for one or more of re-amplifying, re-shaping, and re-timing the optical signal; a distortion compensator device for compensating for distortion associated with the optical signal; and a quality-of-signal monitoring device for measuring the quality of the optical signal. Preferably, the all-optical regenerator device, the distortion compensator device, and the quality-of-signal monitoring device are disposed within a single module. The quality-of-signal monitoring device measures the optical signal subsequent to distortion compensation. Alternatively, the quality-of-signal monitoring device measures the optical signal subsequent to distortion compensation and all-optical regeneration. In various embodiments, the quality-of-signal monitoring device provides feedback to the distortion compensator device, a distortion compensator device disposed along a line system, one or more of an optical amplifier and a distortion compensator device disposed along the line system, and a transmitter device disposed along the line system.

In an optical interconnection module used for data communication, or the like, a semiconductor laser for emitting laser light and a photodiode for monitoring irradiation of the light by the laser are fixed on a first mounting base member made of a single crystalline silicon. An optical fiber is held on a V-shaped groove on the first mounting base member for facing the light emitting layer of the laser. At least a gap between the laser and the optical fiber is filled by a transparent resin having a refractive index equal to or larger than that of the optical fiber but smaller than the light wave guide layer of the laser. The transparent resin portion is further covered by non-transparent resin. The first mounting base member is fixed on a second mounting base member made of ceramic material having thermal expansion coefficient larger than that of the first mounting base but smaller than a circuit substrate made of epoxy resin.

In an optical interconnection module used for data communication, or the like, a semiconductor laser for emitting laser light and a photodiode for monitoring irradiation of the light by the laser are fixed on a first mounting base member made of a single crystalline silicon. An optical fiber is held on a V-shaped groove on the first mounting base member for facing the light emitting layer of the laser. At least a gap between the laser and the optical fiber is filled by a transparent resin having a refractive index equal to or larger than that of the optical fiber but smaller than the light wave guide layer of the laser. The transparent resin portion is further covered by non-transparent resin. The first mounting base member is fixed on a second mounting base member made of ceramic material having thermal expansion coefficient larger than that of the first mounting base but smaller than a circuit substrate made of epoxy resin.

An optical device 1 has a substrate 2, whereas bare fibers 5 exposed from a coated optical fiber tape 3 by removing a coating 4 from its middle part are secured to the upper face part of the substrate 2. In the substrate 2, a transverse groove 8 is formed obliquely with respect to an axis of the bare fibers 5 so as to traverse core parts 5a of the bare fibers. An optical member 9 for reflecting a part of signal light transmitted through the bare fibers 5 is inserted in the transverse groove 8. A support member 10 is provided on the upper side of the bare fibers 5, whereas a support surface 10a of the support member 10 is provided with photodetectors 11 for detecting light reflected by the optical member 9. The support surface 10a of the support member 10 is inclined with respect to the upper face of the substrate 2, whereby the light entrance surface 13 of each photodetector 11 is inclined by a predetermined angle with respect to the upper face of the substrate 2. Such a configuration realizes an optical device which can lower the polarization dependence of received light in the photodetectors.

An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer including a reflective film containing Ag as a primary component and C as an additive. In the thus constituted optical recording medium, recording characteristics and reproducing characteristic of the respective recording layers can be improved.

A substrate for mounting optical semiconductor elements is provided, including a base substrate having an insulating layer and a plurality of wiring circuits formed on the upper face of the insulating layer, and having at least one external connection terminal formation opening portion which penetrates the insulating layer and reaches the wiring circuits; and an optical reflection member, which is provided on the upper face of the base substrate, and which forms at least one depressed portion serving as an area for mounting an optical semiconductor element.

Disclosed is a loose tube optical cable having an unstranded structure, which includes a tensile strength member longitudinally elongated and having a central axis deviated from the center of the optical cable, a loose tube optical fiber unit longitudinally elongated without intended twist against the tensile strength wire, and a cable coating for wrapping an aggregation in which the tensile strength member and the loose tube optical fiber unit are straightly aggregated. By suitably selecting geometric parameters of the tensile strength member and the loose tube optical fiber unit, the center of mass of the aggregation is positioned within the tensile strength member and the maximum modulus of elongation of the optical fiber is restricted within a predetermined range in a predetermined bending radius.

The present invention provides a transparent inorganic oxide dispersion which makes it possible to improve the refractive index and mechanical characteristics and to maintain transparency by modifying the surface of inorganic oxide particles with a surface modifier having one or more reactive functional groups; and an inorganic oxide particle-containing resin composition in which the transparent inorganic oxide dispersion and a resin are compositely integrated by the polymerization reaction, a composition for sealing a light emitting element, a light emitting element, and a method for producing an inorganic oxide particle-containing resin composition; and a hard coat film which has high transparency and makes it possible to improve a refractive index and tenacity, an optical functional film, an optical lens and an optical component. The transparent inorganic oxide dispersion of the present invention comprises inorganic oxide particles which have a surface modified with a surface modifier having one or more reactive functional groups and have a disperse particle diameter of 1 nm or more and 20 nm or less, and a disperse medium, wherein the surface modifier is one or more kinds selected from the group consisting of a silane coupling agent, a modified silicone, and a surfactant.

Extremely advanced technology for scrambling an optical signal based on quantum mechanical fluctuation is used to provide a highly reliable optical communication method which can invalidate illicit activities such as wire-tapping, a system, and a laser oscillator which is used in the method and system. A transmitter side generates laser light, simultaneously oscillated at a plurality of wavelengths, the total number of generated photons being constant, and transmits a signal light comprising data which has been added to the light of the plurality of wavelengths; and at a receiving side, light, simultaneously oscillated at the plurality of wavelengths, is selected from the signal light, and the data is demodulated.

An optical switching subsystem comprising; a plurality of input optical ports for inputting an optical signal, a plurality of output optical ports for outputting the optical signal, an optical switch formed by a micro electromechanical system (MEMS) for switching an optical path among said input optical ports and said output optical ports, a controller for instructing said optical switch to execute switching operation, and self-diagnosis means for measuring performance characteristics of said optical switching subsystem and diagnosing said optical switching subsystem based upon said performance characteristics.

A recordable optical disc includes a user area and a management information area. User data is recorded in a physical block used as a single unit, and the space bit map is recorded in the management information area. Integrity verification processing is performed for each of recording status information so as to verify the integrity of the recording status information indicating a recording status of the physical block and the recording status of the physical block on the recordable optical disc. The necessity of the integrity verification processing is determined by reading out the status information indicating the necessity of the integrity verification processing. When the integrity verification processing is determined to be necessary, the integrity verification processing is carried out for unverified recording status information of the recording status information of the space bit map.

An optical element includes a substrate, a columnar section that is formed above the substrate and has an upper surface for light emission or light incidence, a first protection layer formed above the substrate in a region including at least a circumference of the columnar section, a resin layer formed above the first protection layer, a second protection layer formed above the resin layer, and an electrode that is electrically connected to the upper surface of the columnar section, wherein the first and second protection layers are composed of a material harder than the resin layer.

A substrate for mounting optical semiconductor elements is provided, including a base substrate having an insulating layer and a plurality of wiring circuits formed on the upper face of the insulating layer, and having at least one external connection terminal formation opening portion which penetrates the insulating layer and reaches the wiring circuits; and an optical reflection member, which is provided on the upper face of the base substrate, and which forms at least one depressed portion serving as an area for mounting an optical semiconductor element.

An optical semiconductor apparatus includes: an optical semiconductor device including a translucent support substrate; a buffer layer on the support substrate, a seal ring in a frame shape provided in an outer region on the buffer layer, an active layer provided on an inner region of the buffer layer, and an electrode provided on the active layer. The optical semiconductor apparatus further including: a package substrate on which the optical semiconductor device is mounted; and a sealing part that seals a space between the seal ring and the package substrate.

A highly reliable optical semiconductor device insusceptible to degradation in the characteristics thereof. An n-type buffer layer, n-type first cladding layer, active layer, a p-type first layer of the second cladding layer, p-type etch-stop layer, p-type second layer of the second cladding layer, and p-type contact layer are formed an n-type semiconductor substrate. Two lengths of separation grooves are formed in parallel in such a way as to reach the underside of the p-type second layer of the second cladding layer from the top face of the contact layer, and a ridge is formed between the respective separation grooves. The ridge comprises a lower portion thereof, made up of the second layer of the second cladding layer, and a portion of the contact layer, corresponding to the ridge, made up of the contact layer. Side parts of the top face of the portion of the contact layer, corresponding to the ridge, facing the separation grooves, respectively, are turned to tilted faces, respectively, and a barrier metal layer is formed on top of the tilted faces. Portions extending from side faces of the lower portion of the ridge to run across the respective separation grooves are covered with an insulating film. Since the tilted faces are formed at the respective side parts of the top face of the portion of the contact layer, no stepping occurs to the barrier metal layer. Accordingly, Au of an Au layer formed outside of the barrier metal layer is prevented from being diffused into the portion of the contact layer, corresponding to the ridge, made of GaAs, through steeped parts of the barrier metal layer.

An optical semiconductor apparatus includes: a package substrate that includes a recess that opens on a top surface of the package substrate; a light emitting device housed in the recess; a window member provided to cover an opening of the recess; and a sealing structure that seals a space between the package substrate and the window member. The sealing structure includes a first metal layer provided in a shape of a frame on the top surface of the package substrate, a second metal layer provided in a shape of a frame on an inner surface of the window member, and a metal bonding part provided between the first metal layer and the second metal layer. An entirety of one of the first and second metal layers is positioned in a region where the other of the first and second metal layers is provided.

A recording method and a recording apparatus capable of optimally arranging data on a write-once type optical disc. In a write-once type optical disc recording method with respect to a disc having a read-in, a user area, and a read-out by employing defect management information, the user area is divided into 3, or more pieces of R-zones; at least 2 recordable R-zones having recordable areas are present. When an unrecordable R-zone having no recordable area is present on the read-in side rather than two, or more pieces of the R-zones among the R-zones having the recordable areas, a linear replacement destination of a logical overwriting is determined to such an R-zone other than an R-zone having a recordable area, which is located adjacent to the unrecordable R-zone.

An optical pickup device according to the present invention having two light sources is capable of emitting lights having different wavelengths from each other for recording / reproducing information on / from an optical recording medium by using a light from the light source; wherein the two light sources both are capable of emitting either polarization lights in one polarization direction or polarization lights perpendicular to the one polarization direction, and each of the two light sources is arranged at a predetermined position depending on a polarization direction of the light to be emitted.

Disclosed is a loose tube optical cable having an unstranded structure, which includes a tensile strength member longitudinally elongated and having a central axis deviated from the center of the optical cable, a loose tube optical fiber unit longitudinally elongated without intended twist against the tensile strength wire, and a cable coating for wrapping an aggregation in which the tensile strength member and the loose tube optical fiber unit are straightly aggregated. By suitably selecting geometric parameters of the tensile strength member and the loose tube optical fiber unit, the center of mass of the aggregation is positioned within the tensile strength member and the maximum modulus of elongation of the optical fiber is restricted within a predetermined range in a predetermined bending radius.

For optical data storage applications a near field optical system can be used. In near field optical systems an accurate control of the distance between the solid immersion lens and the disc surface is crucial. After the correction of a tilt between the lens and the disc, the laser beam may not always be parallel to the optical axis. This has a detrimental effect on the gap signal used for the distance control. The optical head of the invention comprises a gap signal correcting unit to take care of such detrimental effects.

In a waveguide 10 including a substrate 1, a lower clad 2, an upper clad 3, and a core 4, the outline of a cross section perpendicular to the light propagating direction of the core 4 surrounded by the lower clad 2 has a shape curved with respect to the center of the cross section. The separation in the waveguide is thereby prevented, and the reliability of the optical property is enhanced.

An optical printed circuit board according to the embodiment includes an insulating layer; an optical wave guide buried in the insulating layer to transmit an optical signal; and an optical path converting part provided on at least one end of the optical wave guide to convert a transmission path of the optical signal defined by the optical wave guide such that the transmission path has a predetermined curvature.

An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer including a reflective film containing Ag as a primary component and C as an additive. In the thus constituted optical recording medium, recording characteristics and reproducing characteristic of the respective recording layers can be improved.

As an object lens for an optical pickup, applied is a single-lens and both-side-convex configuration is applied. Further, specific conditional formulas are created with respect to a particular numerical aperture NA, for a paraxial curvature radius R1 on the surface on the light source side; the working distance WD, the refractive index nd with respect to the d-line, and the focal length f. Furthermore, specific conditional formulas are created for the refractive index nd with respect to the d-line and the Abbe's number νd.

A method and apparatus for loading, detecting, and monitoring channel-associated signals are provided. Channel-associated signals are identified with spread spectrum codes in the electrical domain, and after being modulated to an optical service signal at respective loading points separately, the channel-associated identification signals are transmitted in the optical channel along with the optical signal. At any downstream detecting point, passing optical signals can be converted through photoelectric conversion, and the channel-associated identification signals are de-spread. By detecting the channel-associated signals, it is possible to learn about whether the upstream loading point work normally, whether the optical channel operates normally, etc., and thereby to find possible failures, solve problems, and monitor quality parameters of optical signals in real time, and improve reliability of the optical signal transmission.

Embodiments of the present disclosure disclose an optical cable and an optical cable system, where the optical cable includes an SZ-shaped optical cable skeleton and a plurality of optical fiber units. Skeleton slots is recessed in a periphery of the optical cable skeleton, and the plurality of optical fiber units is grouped and respectively disposed in the corresponding skeleton slots, thereby having the advantages of being easy to strip and draw, high reliability, and long lifetime. Moreover, the optical fiber does not need to be connected when being diverged on floors during installation, thereby reducing the fusion splicing / termination connection time, simplifying the optical cable wiring, greatly reducing deployment cost of an Optical Distribution Network (ODN), and speeding up the scale deployment of the FTTX ODN; in addition, interference among the optical fibers is avoided when the optical fibers are drawn, thereby increasing reliability of the optical fibers after installation.

A wavelength division multiplexer (WDM) and a type of fiber arrangement for the WDM are provided. In the WDM according to the invention, a filter having dielectric coating is used to allow lights within a specific band of wavelength to pass but reflect lights not within the specific band of wavelength. A reflection mirror is then used to reflect the lights passing through the filter to pass through the filter for a second time. Because of the two filtering, the WDM provided by the invention has very high adjacent channel isolation. In particular, the WDM contains a fiber pigtail having a fiber bundle and a ferrule with a square aperture in the center. By carefully arranging the common input fiber, the reflection output fiber, and the transmission output fiber inside the aperture, the lights in the specific band of wavelength have identical wavelength bandwidth when passing through the filter twice, and the insertion loss for both the transmission output and the reflection output is minimum. Having identical wavelength bandwidth implies that the wavelength bandwidth of lights emitted out of the transmission output is not reduced because the lights pass through the filter twice and cancel out each other. On the other hand, minimum insertion loss for both the reflection output and the transmission output implies that the performance of the WDM is optimal.

An optical element includes a substrate, a columnar section that is formed above the substrate and has an upper surface for light emission or light incidence, a first protection layer formed above the substrate in a region including at least a circumference of the columnar section, a resin layer formed above the first protection layer, a second protection layer formed above the resin layer, and an electrode that is electrically connected to the upper surface of the columnar section, wherein the first and second protection layers are composed of a material harder than the resin layer.

[Problem to be Solved]There is provided an optical transmission device in wavelength-division-multiplexing-based optical communications that has both of improved reliability because of provision of backup optical transceiving unit and power saving capability because of appropriate control.[Solution]An optical transmission device is configured with optical switch means 40, a plurality of optical transceiving means 41 and control means 42. The optical switch means 40 outputs an input optical signal to a given path. Each optical transceiving means 41 receives an optical signal from the optical switch means 40 and transmits an optical signal to the optical switch means 40. The control means 42 performs various kinds of control. The optical transceiving means 41 operates in three operation states: a normal mode in which the optical transceiving means transmits and receives optical signals, a first standby mode which is a standby state, and a second standby mode in which power consumption is smaller than power consumption in the first standby mode. The control means 42 includes means for causing the optical transceiving means in the first standby mode to transition to the normal mode and causes the optical transceiving means in the second standby mode to transition to the first standby mode or the normal mode.