Abstract: An optical fiber includes: a core made of silica based glass; a cladding made of silica based glass, the cladding having a refractive index that is lower than a maximum refractive index of the core; and a coating including a primary coating layer, and a secondary coating layer. An outer diameter of the cladding is less than 100 ?m. A thickness of the primary coating layer is larger than or equal to 15 ?m. A mode field diameter at a wavelength of 1310 nm is larger than or equal to 8.6 ?m and smaller than or equal to 9.2 ?m. An effective cutoff wavelength is smaller than or equal to 1260 ?m. A bending loss at a wavelength of 1550 nm when bending is made at a diameter of 60 mm is smaller than or equal to 0.1 dB/100 turn.

Abstract: An optical fiber includes: a core made of silica-based glass; a cladding configured to cover an outer circumference of the core and made of silica-based glass having a refractive index smaller than a maximum refractive index of the core; and a coating configured to cover an outer circumference of the cladding. The cladding has an outer diameter of 120 ?m or smaller, a mode field diameter at a wavelength of 1310 nm is 8.6 ?m to 9.2 ?m, an effective cut-off wavelength is 1260 ?m or smaller, and a bending loss at a wavelength of 1550 nm in a case of bending at a diameter of 20 mm is 0.75 dB/turn or smaller.

Abstract: An optical fiber includes: a core portion made of glass; a side core layer made of glass and enclosing the core portion; a cladding portion made of glass and enclosing the side core layer; and a coating layer including a primary layer made of resin and enclosing the cladding portion, and a secondary layer made of resin and enclosing the primary layer. The relationships ?1>?Clad>?2 and 0>?2 are satisfied where ?1 represents relative refractive-index difference of average maximum refractive index of the core portion with respect to average refractive index of the cladding portion, ?2 represents relative refractive-index difference of average refractive index of the side core layer with respect to average refractive index of the cladding portion, and ?Clad represents relative refractive-index difference of average refractive index of the cladding portion with respect to refractive index of pure silica glass.

Abstract: An optical fiber includes: a core made of silica based glass; a cladding made of silica based glass, the cladding having a refractive index that is lower than a maximum refractive index of the core; and a coating including a primary coating layer, and a secondary coating layer. An outer diameter of the cladding is less than 100 ?m. A thickness of the primary coating layer is larger than or equal to 15 ?m. A mode field diameter at a wavelength of 1310 nm is larger than or equal to 8.6 ?m and smaller than or equal to 9.2 ?m. An effective cutoff wavelength is smaller than or equal to 1260 ?m. A bending loss at a wavelength of 1550 nm when bending is made at a diameter of 60 mm is smaller than or equal to 0.1 dB/100 turn.

Abstract: An optical fiber includes: a core made of silica-based glass; a cladding configured to cover an outer circumference of the core and made of silica-based glass having a refractive index smaller than a maximum refractive index of the core; and a coating configured to cover an outer circumference of the cladding. The cladding has an outer diameter of 120 ?m or smaller, a mode field diameter at a wavelength of 1310 nm is 8.6 ?m to 9.2 ?m, an effective cut-off wavelength is 1260 ?m or smaller, and a bending loss at a wavelength of 1550 nm in a case of bending at a diameter of 20 mm is 0.75 dB/turn or smaller.

Abstract: [Object] To detect states of a plurality of secondary batteries whose kinds are different with high accuracy.

Abstract: To provide a secondary battery state detecting device that decreases the deterioration in capacity of the secondary battery and is low in arithmetic cost. A secondary battery state detecting device that detects a state of a secondary battery includes discharge means (discharge circuit (15)) for subjecting the secondary battery (14) to a pulse discharge, acquiring means (controller (10)) for controlling the discharge means to subject the secondary battery to at least one pulse discharge, and acquiring a time variation of a voltage value at that time, calculating means (controller (10)) for calculating a parameter of a predetermined function having time as a variable by fitting the variation of the voltage value acquired by the acquiring means using the predetermined function, and detecting means (controller (10)) for detecting the state of the secondary battery on the basis of the parameter of the predetermined function calculated by the calculating means.

Abstract: A current limiter arrangement limiting an electric current between a first and a second terminal includes a first current limiting device and a second current limiting device arranged between the first and the second terminal. The first and the second current limiting device each include a substrate having a substrate surface area and a substrate thickness, and include a superconducting section arranged on the substrate and thermally coupled to the substrate thereby covering a coupling surface area on the substrate. Each of the superconducting sections has a critical current value and the substrate surface areas, the substrate thicknesses and or the coupling surface areas are implemented as a function of the critical current values.

Abstract: [Object] To detect states of a plurality of secondary batteries whose kinds are different with high accuracy.

Abstract: To provide a secondary battery state detecting device that decreases the deterioration in capacity of the secondary battery and is low in arithmetic cost. A secondary battery state detecting device that detects a state of a secondary battery includes discharge means (discharge circuit (15)) for subjecting the secondary battery (14) to a pulse discharge, acquiring means (controller (10)) for controlling the discharge means to subject the secondary battery to at least one pulse discharge, and acquiring a time variation of a voltage value at that time, calculating means (controller (10)) for calculating a parameter of a predetermined function having time as a variable by fitting the variation of the voltage value acquired by the acquiring means using the predetermined function, and detecting means (controller (10)) for detecting the state of the secondary battery on the basis of the parameter of the predetermined function calculated by the calculating means.

Abstract: A full charge sensing apparatus for sensing a fully charged state of a secondary battery based on an equivalent circuit model of the secondary battery includes a measuring unit that measures a voltage and a current during charging of the secondary battery, a learning unit that performs a learning process on a plurality of parameters in the equivalent circuit model using a result of measurement of the measuring unit, and a determining unit that determines that the secondary battery is in a fully charged state in a case where, among the parameters on which the learning process has been performed by the learning unit, a parameter corresponding to a reaction resistance of the secondary battery is greater than a predetermined threshold.