摘要:
An optical receiver is disclosed, in which no additional photodiode to monitor the optical input level and no temperature control unit are necessary. The receiver of the invention provides an avalanche photodiode (APD) to receiver the first optical signal with the first wavelength and a PIN-PD to receive the second optical signal with the second wavelength. The optical input level for the APD is indirectly determined through the photocurrent generated by the PIN-PD and the bias voltage for the APD is so adjusted that the APD shows an optimum multiplication factor for the optical input level.
摘要:
The present invention provides a method to maintain a multiplication factor of an avalanche photodiode independent on temperatures without additional devices. The light-receiving apparatus of the invention includes an avalanche photodiode (APD), a dividing circuit, and a bias supplying circuit. The APD has a first region, where a significant multiplication factor appears, and a second region without any multiplication factor. The dividing circuit extracts a second signal
摘要:
A current voltage converter circuit includes a light receiving element which receives a light output from a laser and generates a light current according to the light output, a current distributor circuit which distributes the light current from the light receiving element, the current distributor circuit being configured of a current mirror circuit which includes a transistor pair and a first operating amplifier. The current voltage converter circuit further includes a voltage converter circuit which converts a current distributed by the current distributor circuit into a voltage, the voltage converter circuit including a second operating amplifier.
摘要:
A method to control an LD (laser diode) is disclosed. The method compares the operating temperature of the LD with a transition temperature. When the former temperature exceeds the latter, the modulation current is set based on the bias current, which is independently determined by the APC loop. On the other hand, the operating temperature is less than the transition temperature; the modulation current is determined by the operating temperature.
摘要:
It is intended to provide a sensor chip which has a small size and is easily produced and capable of determining quantities of at least two components of multiple samples rapidly, conveniently, and correctly as well as to provide a production method capable of producing the sensor chip easily and with high productivity.A sensor chip includes a substrate, a cover layer, a spacer layer sandwiched between the substrate and the cover layer, multiple reaction portions disposed between the substrate and the cover layer, multiple detection units exposed in the hollow reaction portions, and a sample inlet communicated with the hollow reaction portions and a method for producing the sensor chip.A sensor chip includes two substrates opposed to each other, a spacer layer sandwiched between the substrates, and multiple measurement units disposed between the substrates and including two or more hollow reaction portions that share one sample inlet opened on outer surfaces of the substrates and detection electrode units respectively exposed in the hollow reaction portions and a method for producing the sensor chip.
摘要:
Provided are a biosensor chip measurement machine that can obtain accurate measurement results within a short period of time by employing only a tiny amount as a sample, and a measurement method therefor.A biosensor measurement machine 20 includes a power source 21, which is connected to a voltage regulator 22, a measurement instrument 23, and a controller 24 for supplying power. When a biosensor chip 1 is connected to the biosensor measurement machine 20 and a voltage is applied, the measurement instrument begins the measurement of a current value for a biosensor. When a measured current value or a measured charge value is greater than a reference value, the measurement is ended in accordance with an instruction issued by the controller 24, and when the value is smaller than the reference value, the measurement is continued in accordance with a controller instruction.
摘要:
There is provided a sensor chip including: a base plate; a cover layer; a hollow reaction portion provided between the base plate and the cover layer, in which a reaction is performed between a sample and a reagent applied thereinto; a sensing member constructed of an electrode which is exposed to the hollow reaction portion; and a sample inlet for conducting the sample to the hollow reaction portion, wherein entire portions of the base plate and the cover layer, which are located opposite to the sensing member provided with the hollow reaction portion, are made transparent. Otherwise, in the above-described sensor chip, a plate A having a groove A to which a reagent has been applied and a plate B having a groove B are stacked on each other in such a manner that the groove A is coupled with the groove B, so that the hollow reaction portion is formed; and an opening width of the groove B is larger than an opening width of the groove A at a portion of the groove B which is located opposite to a portion with the groove A, to which the reagent has been applied.
摘要:
It is intended to provide a biosensor chip capable of rapid and correct measurement, including a reaction chamber that enables a measurement of a very small amount of a measurement sample and has a small capacity and potassium ferricyanide having a very small crystal particle size disposed in the reaction chamber.In a biosensor chip 1, electrodes 3 and 4 are disposed on the lower substrate 2, and lower spacer 5 (7 and 8) is adhered on the electrodes 3 and 4. An upper spacer 11 (12 and 13) is adhered to an upper substrate 15, and a lower spacer 5 is attached to the upper spacer 11 by and adhesive agent 10. A lower groove 9 is formed between long and short lower spacers 7 and 8, and an upper groove 14 is formed between long and short spacers 12 and 13, so that a reaction chamber 17 is formed by the upper and lower grooves 9 and 14. A capacity of the reaction chamber is 0.3 μL, and an enzyme 18 and potassium ferricyanide are disposed in the reaction chamber 17 in such a fashion as to oppose to each other with a gap being defined therebetween. A crystal particle diameter of the potassium ferricyanide is 100 μm or less, and amount of the potassium ferricyanide is V×0.1 mg or more when the capacity of the reaction chamber 17 is V.
摘要:
The invention discloses an optical receiver that prevents the instability of the bias voltage to the avalanche photodiode (APD) and facilitates the recovery of the bias voltage from the safety value. The optical receiver comprises the APD, the DC-DC converter to supply the bias voltage to the APD, the current detector to detect the photo current generated by the APD, and the controller to set the bias voltage. The controller, evaluating the optical input power based on the output voltage of the DC-DC converter and the monitored current, sets the output voltage based on the change of the optical input power.
摘要:
The present invention provides a method to maintain a multiplication factor of an avalanche photodiode independent on temperatures without additional devices. The light-receiving apparatus of the invention includes an avalanche photodiode (APD), a dividing circuit, and a bias supplying circuit. The APD has a first region, where a significant multiplication factor appears, and a second region without any multiplication factor. The dividing circuit extracts a second signal.