Abstract: A wireless communication terminal comprises a detection section, an acquisition section and a control section. The detection section detects activation of a voice telephone service application. The acquisition section acquires wireless station information transmitted from a wireless station that is a communication partner. The control section is set so as to ensure that a wireless receiver that receives wireless station information from the wireless station is always put in the ON condition when activation of the voice telephone service application is detected by the detection section. The control section sets the reception processing interval for which wireless station information is received and processed by the wireless receiver to a first interval in accordance with the wireless station information acquired by the acquisition section. The first interval is a time interval in which reception of voice telephone service incoming calls during standby is enabled.

Abstract: A communications device includes a processor configured to detect a wirelessly communicating base station, using a given interval; determine whether identification information of the detected base station matches identification information of a base station detected last time; and set the given interval to a second interval upon determining that the identification information of the detected base station and the identification information of the base station detected last time match. The second interval is longer than a first interval that is set upon determining that the identification information of the detected base station and the identification information of the base station detected last time do not match.

Abstract: A radio communications terminal includes a processor configured to detect that an application of a voice communications service is activated in the radio communications terminal; obtain wireless station information transmitted from a wireless station, which is a communication counterpart; and set a wireless receiver that receives the wireless station information from the wireless station to be in an always-on state and sets based on the wireless station information obtained, a reception processing interval at which the wireless receiver performs reception processing of the wireless station information, the reception processing interval being set to be a first interval, upon detecting that the application of the voice communications service is activated. The first interval is a time interval that enables an incoming call of the voice communications service to be received during a standby state.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: A repeating apparatus disposed at an end point of each divisional repeating interval of a light transmission line performs a first dispersion compensation step, an optical add/drop multiplexing step and a second dispersion compensation step to perform repeating transmission. The ratio of an over compensation amount at the second dispersion compensation step to the sum of dispersion compensation amounts at the first and second dispersion compensation steps is set so as to gradually vary together with the transmission distance from the terminal apparatus for transmission at which the repeating apparatus is disposed on the light transmission line so that degradation of wavelengths to be received by the terminal apparatus for reception is suppressed while dispersion compensation is performed with a high degree of accuracy at each optical add/drop multiplexing point on the transmission line.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: A repeating apparatus disposed at an end point of each divisional repeating interval of a light transmission line performs a first dispersion compensation step, an optical add/drop multiplexing step and a second dispersion compensation step to perform repeating transmission. The ratio of an over compensation amount at the second dispersion compensation step to the sum of dispersion compensation amounts at the first and second dispersion compensation steps is set so as to gradually vary together with the transmission distance from the terminal apparatus for transmission at which the repeating apparatus is disposed on the light transmission line so that degradation of wavelengths to be received by the terminal apparatus for reception is suppressed while dispersion compensation is performed with a high degree of accuracy at each optical add/drop multiplexing point on the transmission line.

Abstract: In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.

Abstract: A laser beam generated between a total reflector and an output coupler is turned back by plural reflectors which are mounted in a discharge region along two main electrodes at 45.degree., and the discharge region is divided into plural divided discharge regions, thus, a diameter of an output laser beam is reduced to a diameter of the divided discharge regions.

Abstract: A reflector for an excimer laser is composed of an aluminum layer deposited on a substrate and at least two pairs of dielectric multilayers of high refractive index material and low refractive index material alternately piled on the aluminum layer, and optical thickness of the respective layers of an outer pair of the dielectric multilayers are deviated from .lambda./4 and total optical thickness of the outer pair is made to be .lambda./2.

Abstract: A method of operating a laser is disclosed which includes irradiating an optical component in an atmosphere of dry air or dry inert gas with a laser beam, wherein the optical component is provided with an antireflection film having at least a layer of calcogenide glass and a layer of potassium chloride or lead fluoride.

Abstract: An antireflection film composed of a layer of arsenic triselenide having an optical thickness in the range between 2.518 and 2.783 .mu.m, a layer of potassium chloride having an optical thickness in the range between 1.151 and 1.272 .mu.m and a layer of arsenic triselenide having an optical thickness in the range between 0.577 and 0.749 .mu.m which are successively formed on a member of infrared radiation transmitting material formed of a mixture of thalium iodide and thalium bromide. The member provided with the three-layer antireflection film is used in an atmosphere of protective gas, such as dry air or dry N.sub.2 gas.

Abstract: An anti-reflection coating film is disclosed which has a three-layer structure and is adapted to be deposited on a substrate made of a mixed crystal of thallium iodide and thallium bromide. The structure comprises a first arsenic triselenide layer, a second lead fluoride layer and a third arsenic triselenide layer for protection of the second layer.

Abstract: An antireflection coating for a potassium chloride substrate has a first arsenic trisulfide (As.sub.2 S.sub.3) layer, a lead fluoride (PbF.sub.2) layer and a second arsenic trisulfide (As.sub.2 S.sub.3) layer which are formed on at least one major surface of the potassium chloride (KCl) substrate in the order named. The antireflection coating withstands to irradiate of a high-power carbon dioxide gas laser. The antireflection coating also has good optical characteristics and moisture resistance.