摘要:
An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM signal. Accordingly, before realizing the recovery of shutdown, the gain setting is completed with the light whose intensity is within the safe criterion. After realizing the recovery of shutdown, the optical transmission system can be returned quickly to the regular operating state after recovery of shutdown state.
摘要:
An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM signal. Accordingly, before realizing the recovery of shutdown, the gain setting is completed with the light whose intensity is within the safe criterion. After realizing the recovery of shutdown, the optical transmission system can be returned quickly to the regular operating state after recovery of shutdown state.
摘要:
A Raman amplification apparatus includes a pumping light supplying section, a main signal wavelength light level acquisition section, a monitoring signal wavelength light level acquisition section, a function information storage section for storing, as function information, information regarding functions for deriving a noise amount and a gain by Raman amplification with regard to a monitoring signal wavelength light with respect to pumping light power supplied from the pumping light supplying section, and a transmission characteristic derivation section for deriving a transmission characteristic on an optical transmission line based on information acquired by the main signal wavelength light level acquisition section and the monitoring signal wavelength light level acquisition section and the function information stored in the function information storage section, and Raman gain is derived with high accuracy in comparison with the conventional technique.
摘要:
A light amplifying device including a Raman amplifier to Raman-amplify a signal light by inputting excitation lights of a plurality of wavelengths to a transmission path through which the signal light propagates, a plurality of measuring units measuring powers of light output from the Raman amplifier in a plurality of wavelength bands included in an amplification band of the Raman amplifier, a calculating unit calculating a ratio of the respective powers measured by at least two of the plurality of measuring units, and a control unit controlling a power ratio of the respective excitation lights input to the transmission path by the Raman amplifier based on the ratio calculated by the calculating unit.
摘要:
An optical transmission device includes: an attenuator that attenuates an optical signal before being input into an optical element by a predetermined attenuation amount determined so that a level of an adjustment optical signal input into the optical element falls within a predetermined dynamic range of the optical element; and a controller that adjusts the predetermined attenuation amount so that a level of the optical signal input into the optical element falls within the predetermined dynamic range.
摘要:
The present invention relates to an electronic apparatus, a control circuit of an electronic apparatus, and a method of controlling an electronic apparatus that change different states by a predetermined input operation, and has an object of providing an electronic apparatus, a control circuit of an electronic apparatus, and a method of controlling an electronic apparatus that prevent the transition of states due to an unintentional operation. A SUSPEND/RESUME signal generation part 151 for generating a SUSPEND/RESUME signal whose level becomes LOW when a SUSPEND/RESUME button 110 is pressed and a SUSPEND/RESUME signal control part 152 for maintaining the LOW-level period of the SUSPEND/RESUME signal generated by the SUSPEND/RESUME signal generation part 151 within a predetermined period T0 are provided between the SUSPEND/RESUME button 110 and a chip set 139 that achieves a SUSPEND or RESUME function when the SUSPEND/RESUME button 110 is pressed.
摘要:
A pen-input information processing device comprises a pen housing for housing a pen, a processing device, a suspension/resumption-instruction-unit for instructing the processing device to perform state transition, from a suspended state to a normal state and vice versa, a pen-housing-detection-unit which outputs a pen-housing-detection-signal which shows the existence or non-existence of a pen in the pen housing in detecting the housing of the pen in the pen housing, and a state-transition-control-unit which generates a state-transition-control-signal which instructs the processing device to perform the transition of a state unconditionally when the suspension/resumption-instruction-unit instructs the processing device to perform the state transition, or does not instruct the processing device to perform state transition in either case where a state is in the suspended state and also the pen-housing-detection-signal shows the housed state of the pen in the pen housing, or where the state is in the normal state and also the pen-housing-detection-signal shows the taken out state of the pen from the pen housing.
摘要:
To obtain automatic gain control with high accuracy by including first and second light monitors, a reference light supplying unit supplying reference light of which wavelength is set within a gain band of a distributed Raman amplification and out of a wavelength band of main signal light to the optical transmission path, a first reference light monitor monitoring a power of the reference light input to the optical transmission path from one end side thereof, a second reference light monitor monitoring the power of the reference light output from the other end side of the optical transmission path, and a controlling unit controlling supply of pump light in a pump light supplying unit as well as supervising a state of the optical transmission path, based on monitor results from the first and second light monitor and the monitor results in the first and second reference light monitors.
摘要:
A light amplifying device including a Raman amplifier to Raman-amplify a signal light by inputting excitation lights of a plurality of wavelengths to a transmission path through which the signal light propagates, a plurality of measuring units measuring powers of light output from the Raman amplifier in a plurality of wavelength bands included in an amplification band of the Raman amplifier, a calculating unit calculating a ratio of the respective powers measured by at least two of the plurality of measuring units, and a control unit controlling a power ratio of the respective excitation lights input to the transmission path by the Raman amplifier based on the ratio calculated by the calculating unit.
摘要:
The WDM optical transmission system using distributed Raman amplification, before starting operation of main signal light, transfers a plurality of lights having different wavelengths to that of the main signal light (for example Raman amplification pump lights or the like) between first and second optical transmission devices connected to opposite ends of a transmission line, monitors transmission line input and output power for each light, calculates a transmission line loss in each wavelength using the monitor results, and specifies a type of the transmission line based on a loss wavelength characteristic that can be estimated from the calculation result. Then the power of pump light provided to the transmission light is optimized in accordance with the type of transmission line.