Optical power meter
First Claim
1. An optical power meter, comprising:
- a photodiode for generating a current based on power of an incident light beam; and
an amplifier circuit for converting the current into a voltage, the amplifier circuit comprising;
an amplifier having an inverting input terminal and an output terminal;
a plurality of resistors, each of the resistors having a first terminal connected with the inverting input terminal; and
a relay having a first terminal connected with the output terminal;
wherein the relay selectively connects one of the plurality of resistors with the output terminal so that the value of the voltage outputted by the output terminal is within a predetermined range, and the on-resistance of the relay is not larger than 10 ohms.
1 Assignment
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Accused Products
Abstract
An optical power meter including a photodiode and an amplifier circuit is provided. The photodiode is for generating a current based on the power of a light beam incidents thereon. The amplifier circuit is for converting the current into a voltage and includes an amplifier, a capacitor, a plurality of resistors and a relay. The amplifier includes an inverting input terminal and an output terminal. The capacitor has a first terminal connected with the inverting input terminal and a second terminal connected with the output terminal. Each of the plurality of resistors has a first terminal connected with the inverting input terminal. The relay has a first terminal connected with the output terminal. The relay selectively connects one of the resistors with the output terminal so that the value of the voltage outputted by the output terminal is within a predetermined range. The on-resistance of the relay is not larger than 10 Ω.
12 Citations
20 Claims
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1. An optical power meter, comprising:
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a photodiode for generating a current based on power of an incident light beam; and
an amplifier circuit for converting the current into a voltage, the amplifier circuit comprising;
an amplifier having an inverting input terminal and an output terminal;
a plurality of resistors, each of the resistors having a first terminal connected with the inverting input terminal; and
a relay having a first terminal connected with the output terminal;
wherein the relay selectively connects one of the plurality of resistors with the output terminal so that the value of the voltage outputted by the output terminal is within a predetermined range, and the on-resistance of the relay is not larger than 10 ohms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical power meter, comprising:
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a photodiode for generating a current based on power of an incident light beam;
an amplifier circuit for converting the current into a voltage, the amplifier circuit comprising;
an amplifier having an inverting input terminal and an output terminal;
a capacitor having a first terminal connected with the inverting input terminal and a second terminal connected with the output terminal;
a plurality of resistors, each of the resistors having a first terminal connected with the inverting input terminal; and
a relay having a first terminal connected with the output terminal, wherein the relay selectively connects one of the plurality of resistors with the output terminal so that the value of the voltage outputted by the output terminal is within a predetermined range, and the on-resistance of the relay is not larger than 10 ohms; and
a controller having an analog-to-digital (A/D) converter for converting the voltage into a digital signal, wherein the controller utilizes the digital signal to determine whether the value of the voltage is within the predetermined range and controls the relay to selectively connect one of the plurality of resistors with the output terminal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification