Optical receiver
AssigneeSumitomo Electric Industries, Ltd.
InventorTakeshi Irie
Life of this patent
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Abstract
The present invention provides an optical receiver in which a signal detection level is independent on whether a ammeter is connected to a current monitor terminal or not. The optical receiver comprises a photo diode, a first current mirror circuit connected to the photo diode and a second current mirror circuit. The second current mirror circuit has a pair of current path, one of which is connected to the first current mirror circuit and the other of which is connected to the voltage source provided within the optical receiver. The voltage source supplies a bias whether an ammeter is connected to the other of the current path or not. Therefore, the signal detection level attributed to one of the current path is unchanged.
Claims6
An optical receiver, comprising:
- a photo diode for receiving signal light and generating a photo current corresponding to the signal light;
- a first current mirror circuit having a pair of current path, the photo diode being connected to one of the current path;
- a second current mirror circuit having a pair of current path, a first terminal, a second terminal, a third terminal and a fourth terminal, the first and second terminals being connected to one of the paired current path at each ends thereof, the third and fourth terminal being connected to the other of the paired current path at each ends thereof, the first terminal being connected to the other of the paired current path of the first current mirror circuit;
- a signal detection circuit connected to the second terminal of the second current mirror circuit;
- a current monitor terminal connected to the third terminal of the second current mirror circuit;
- and
- a voltage source connected to the third terminal of the second current mirror circuit for supplying a bias to the other of the paired current path of the second current mirror circuit
Dependencies are inferred from the claim text.