Abstract: An optical phase shifter according to the invention includes the thermo-optical element of which a refractive index with respect to an input optical signal changes dependently on temperature; a temperature change section, having contact with one end of the thermo-optical element and of which a temperature changes so that a temperature of the thermo-optical element becomes a desired temperature; a heat dissipation section being disposed on an opposite side of the thermo-optical element with respect to the temperature change section and going into a state of thermal equilibrium at a temperature different from the temperature of the temperature change section; and a temperature buffer section, being disposed between the temperature change section and the heat dissipation section, having contact with the temperature change section and the heat dissipation section, and having a heat resistance greater than that of the heat dissipation section.

Abstract: Provided is an optical receiver module capable of suppressing an increase, which is caused by tolerance of angle occurring at a time of manufacturing, in an amount of reflected return light that enters into an optical fiber while ensuring light-receiving efficiency. The light-receiving element (10) is arranged so that directions of the lines, which extend along the edges contained in a surface of the light-receiving element (10) on a side of the light-receiving-element support member (11), and which intersect with the region surrounded by a straight line corresponding to the incident direction of the light, a straight line corresponding to a direction of the optical axis of the optical fiber (3), and a supporting surface of the light-receiving-element support member (11) for supporting the light-receiving element (10), correspond to the directions different from the directions orthogonal to the incident direction of the light.

Abstract: An optical phase shifter according to the invention includes the thermo-optical element of which a refractive index with respect to an input optical signal changes dependently on temperature; a temperature change section, having contact with one end of the thermo-optical element and of which a temperature changes so that a temperature of the thermo-optical element becomes a desired temperature; a heat dissipation section being disposed on an opposite side of the thermo-optical element with respect to the temperature change section and going into a state of thermal equilibrium at a temperature different from the temperature of the temperature change section; and a temperature buffer section, being disposed between the temperature change section and the heat dissipation section, having contact with the temperature change section and the heat dissipation section, and having a heat resistance greater than that of the heat dissipation section.

Abstract: The plurality of host systems or the plurality of applications include an insertion unit for sending the identifier. The storage controller includes an analysis unit for identifying a host system or an application based on the identifier contained in the access information and analyzing an access pattern of access information sent from the identified host system or application, a management unit for managing the identifier, the analysis result of the access pattern analyzed with the analysis unit, and a control method for controlling the processing of data to be sent from a host system based on the analysis result or data to be stored in a logical volume, and a data processing controller for controlling the processing of data to be sent from a host system or data to be stored in a logical volume according to the control method managed by the management unit.

Abstract: The plurality of host systems or the plurality of applications include an insertion unit for sending the identifier. The storage controller includes an analysis unit for identifying a host system or an application based on the identifier contained in the access information and analyzing an access pattern of access information sent from the identified host system or application, a management unit for managing the identifier, the analysis result of the access pattern analyzed with the analysis unit, and a control method for controlling the processing of data to be sent from a host system based on the analysis result or data to be stored in a logical volume, and a data processing controller for controlling the processing of data to be sent from a host system or data to be stored in a logical volume according to the control method managed by the management unit.

Abstract: The plurality of host systems or the plurality of applications include an insertion unit for sending the identifier. The storage controller includes an analysis unit for identifying a host system or an application based on the identifier contained in the access information and analyzing an access pattern of access information sent from the identified host system or application, a management unit for managing the identifier, the analysis result of the access pattern analyzed with the analysis unit, and a control method for controlling the processing of data to be sent from a host system based on the analysis result or data to be stored in a logical volume, and a data processing controller for controlling the processing of data to be sent from a host system or data to be stored in a logical volume according to the control method managed by the management unit.

Abstract: Data in a storage area to be returned from among storage areas of a storage system is deleted without fail, thereby ensuring data security. When a user's storage-on-demand management program 24 is activated in response to a return request from user A's console terminal 18, the return request is transferred via a communication network 14 to a server 16, and a provider's storage on-demand management program 30 makes a request to a storage management program 32 for volume initialization and data deletion. After the storage management program 32 issues a volume initialization command after receiving the above request, a control program 76 is activated to initialize the designated volume. Subsequently, the user A's volume access right is deleted by the processing executed by the provider's storage-on-demand management program 30, and it is reported to the console terminal 18 that the volume initialization and the volume separation have been conducted.

Abstract: Provided is an optical receiver module capable of suppressing an increase, which is caused by tolerance of angle occurring at a time of manufacturing, in an amount of reflected return light that enters into an optical fiber while ensuring light-receiving efficiency. The light-receiving element (10) is arranged so that directions of the lines, which extend along the edges contained in a surface of the light-receiving element (10) on a side of the light-receiving-element support member (11), and which intersect with the region surrounded by a straight line corresponding to the incident direction of the light, a straight line corresponding to a direction of the optical axis of the optical fiber (3), and a supporting surface of the light-receiving-element support member (11) for supporting the light-receiving element (10), correspond to the directions different from the directions orthogonal to the incident direction of the light.

Abstract: An optical transmitter module is described. The optical transmitter module includes a lead pin for electrically connecting the inside and outside of a housing, and a flexible printed circuit board connected to the lead pin. The flexible printed circuit board has a signal pattern and two ground conductor patterns to be connected to an optical modulation element, a laser terminal pattern to be connected to a semiconductor laser, a Peltier terminal pattern to be connected to a Peltier element, and two covering conductive layers in addition to a layer on which such patterns are formed. The covering conductive layers cover all the patterns except for the signal pattern.

Abstract: The plurality of host systems or the plurality of applications include an insertion unit for sending the identifier. The storage controller includes an analysis unit for identifying a host system or an application based on the identifier contained in the access information and analyzing an access pattern of access information sent from the identified host system or application, a management unit for managing the identifier, the analysis result of the access pattern analyzed with the analysis unit, and a control method for controlling the processing of data to be sent from a host system based on the analysis result or data to be stored in a logical volume, and a data processing controller for controlling the processing of data to be sent from a host system or data to be stored in a logical volume according to the control method managed by the management unit.

Abstract: An optical transmitter module is described. The optical transmitter module includes a lead pin for electrically connecting the inside and outside of a housing, and a flexible printed circuit board connected to the lead pin. The flexible printed circuit board has a signal pattern and two ground conductor patterns to be connected to an optical modulation element, a laser terminal pattern to be connected to a semiconductor laser, a Peltier terminal pattern to be connected to a Peltier element, and two covering conductive layers in addition to a layer on which such patterns are formed. The covering conductive layers cover all the patterns except for the signal pattern.

Abstract: Both wavelength dispersion and a dispersion slope of a line fiber are simultaneously compensated for by combining two types of dispersion compensators having different characteristics.

Abstract: Data in a storage area to be returned from among storage areas of a storage system is deleted without fail, thereby ensuring data security. When a user's storage-on-demand management program 24 is activated in response to a return request from user A's console terminal 18, the return request is transferred via a communication network 14 to a server 16, and a provider's storage on-demand management program 30 makes a request to a storage management program 32 for volume initialization and data deletion. After the storage management program 32 issues a volume initialization command after receiving the above request, a control program 76 is activated to initialize the designated volume. Subsequently, the user A's volume access right is deleted by the processing executed by the provider's storage-on-demand management program 30, and it is reported to the console terminal 18 that the volume initialization and the volume separation have been conducted.

Abstract: A computing system and encryption/decryption method realizes assurance of security and improvement of throughput in a remote system. For this purpose, encrypted data is written to a storage system, it is determined whether data in the storage system is ciphertext or plaintext, and encrypted data is read, decrypted and re-written in storage asyncronously with writing encrypted data to storage.

Abstract: Both wavelength dispersion and a dispersion slope of a line fiber are simultaneously compensated for by combining two types of dispersion compensators having different characteristics.

Abstract: Both wavelength dispersion and a dispersion slope of a line fiber are simultaneously compensated for by combining two types of dispersion compensators having different characteristics.

Abstract: A signal light passes through an isolator, and is coupled by a coupler with a pump light from a pump light source. Then, the signal light passes through an ASE reflection filter, is amplified by an EDF, and is transmitted from an isolator. At this time, an ASE light having a predetermined wavelength among ASE lights that occur within the EDF and proceed to the ASE reflection filter is reflected and again input to the EDF. By setting the predetermined wavelength to a wavelength on the short wavelength side of an amplification band of the EDF, gain deviation occurring on the long wavelength side of the amplification band can be cancelled.

Abstract: A computing system and encryption/decryption method realizes assurance of security and improvement of throughput in a remote system. For this purpose, encrypted data is written to a storage system, it is determined whether data in the storage system is ciphertext or plaintext, and encrypted data is read, decrypted and re-written in storage asynchronously with writing encrypted data to storage.

Abstract: A disk array stores data records and parity records. The data records are transferred to the disk array through a control unit that is connected to a host processor. The disk array is part of a disk unit having a processor for generating parity records from information sent by the control unit to the disk unit. The parity record is generated and stored in the disk unit to reduce the number of data transfer operations between the control unit and the disk unit for storage systems using disk array disk units.

Abstract: A signal light passes through an isolator, and is coupled by a coupler with a pump light from a pump light source. Then, the signal light passes through an ASE reflection filter, is amplified by an EDF, and is transmitted from an isolator. At this time, an ASE light having a predetermined wavelength among ASE lights that occur within the EDF and proceed to the ASE reflection filter is reflected and again input to the EDF. By setting the predetermined wavelength to a wavelength on the short wavelength side of an amplification band of the EDF, gain deviation occurring on the long wavelength side of the amplification band can be cancelled.