Frequency characteristic adjusting circuit, optical transmitter, and optical transceiver
AssigneeFujitsu Limited
InventorsYuuki Ogata, Toshihiko Mori
Life of this patent
Estimating the term…
Abstract
Disclosed is a frequency characteristic adjusting circuit disposed between an optical circuit element and a drive circuit driving the optical circuit element. The frequency characteristic adjusting circuit includes a capacitor, and two or more series circuits having a resistor and a switch, the two or more series circuits being connected in parallel with the capacitor, where resistance with respect to the switch that is turned on is changed according to an output voltage of the drive circuit by changing ON or OFF of the switch such that electric charge at a contact point between the optical circuit element and the capacitor is adjusted to be constant regardless of the output voltage of the drive circuit.
Claims11
A frequency characteristic adjusting circuit disposed between an optical circuit element and a drive circuit driving the optical circuit element, the frequency characteristic adjusting circuit comprising:
- a capacitor;
- and
- two or more series circuits each having a resistor and a switch, the two or more series circuits being connected in parallel with the capacitor, wherein
- resistance of the frequency characteristic adjusting circuit is changed according to an output voltage of the drive circuit by changing an ON/OFF state of the switch of at least one of the series circuits such that electric charge at a contact point between the optical circuit element and the capacitor is adjusted to be constant regardless of the output voltage of the drive circuit.
An optical transmitter comprising:
- an optical circuit element configured to output an optical signal based on an electric signal;
- a drive circuit configured to drive the optical circuit element;
- and
- a frequency characteristic adjusting circuit disposed between the optical circuit element and the drive circuit, the frequency characteristic adjusting circuit including
- a capacitor, and two or more series circuits each having a resistor and a switch, the two or more series circuits being connected in parallel with the capacitor, wherein resistance of the frequency characteristic adjusting circuit is changed according to an output voltage of the drive circuit by changing an ON/OFF state of the switch of at least one of the series circuits such that electric charge at a contact point between the optical circuit element and the capacitor is adjusted to be constant regardless of the output voltage of the drive circuit.
An optical transceiver comprising:
- an optical transmitter including
- an optical circuit element configured to output an optical signal based on an electric signal,
- a drive circuit configured to drive the optical circuit element, and
- a frequency characteristic adjusting circuit disposed between the optical circuit element and the drive circuit, wherein the frequency characteristic adjusting circuit includes a capacitor, and two or more series circuits each having a resistor and a switch, the two or more series circuits being connected in parallel with the capacitor, wherein resistance of the frequency characteristic adjusting circuit is changed according to an output voltage of the drive circuit by changing an ON/OFF state of the switch of at least one of the series circuits such that electric charge at a contact point between the optical circuit element and the capacitor is adjusted to be constant regardless of the output voltage of the drive circuit;
- and
- an optical receiver.
Dependencies are inferred from the claim text.