OPTICAL POWER MONITORING CIRCUIT, OPTICAL TRANSCEIVER, OPTICAL MODULE, OPTICAL RECEIVER, AMPLIFIER CIRCUIT, AND INTEGRATED CIRCUIT
First Claim
1. An optical power monitoring circuit comprising:
- a first amplifier that amplifies an input current from a light-receiving element with a variable gain to convert the current into a voltage signal;
a second amplifier that amplifies the output of the first amplifier to convert the output into a main signal output;
a third amplifier that amplifies the output of the first amplifier with a variable gain to convert the output into a monitor output; and
gain variable means for changing the gain of the first amplifier and gain of the third amplifier depending on the output of the first amplifier.
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Accused Products
Abstract
Optical power monitoring capable of achieving a wide dynamic range and high-speed response is realized. An optical power monitoring circuit includes: a first amplifier (TIA 2) that amplifies an input current from a light-receiving element (PD 1) with a variable gain to convert the current into a voltage signal; a second amplifier (LIM 3) that amplifies the output of the first amplifier to convert the output into a main signal output; a third amplifier (AMP 4) that amplifies the output of the first amplifier with a variable gain to convert the output into a monitor output; and a gain variable means (amplifier comparator 5) for changing the gain of the first amplifier and gain of the third amplifier depending on the output of the first amplifier.
7 Citations
11 Claims
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1. An optical power monitoring circuit comprising:
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a first amplifier that amplifies an input current from a light-receiving element with a variable gain to convert the current into a voltage signal; a second amplifier that amplifies the output of the first amplifier to convert the output into a main signal output; a third amplifier that amplifies the output of the first amplifier with a variable gain to convert the output into a monitor output; and gain variable means for changing the gain of the first amplifier and gain of the third amplifier depending on the output of the first amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An amplifier circuit comprising:
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a first amplifier that amplifies an input current from a light-receiving element with a variable gain to convert the current into a voltage signal; a second amplifier that amplifies the output of the first amplifier to convert the output into a main signal output; a third amplifier that amplifies the output of the first amplifier with a variable gain to convert the output into a monitor output; and gain variable means for changing the gain of the first amplifier and gain of the third amplifier depending on the output of the first amplifier. - View Dependent Claims (11)
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Specification