US 11,082,032 B2 · System for generating low-jitter digital clock signals using pulsed laser

Abstract

A low-jitter digital clock signal generating system which uses optical pulses output from a pulse laser includes a first balanced photodetector that converts first and second optical pulses with a delayed time interval into first and second electrical pulses through first and second photodiodes and outputs first and second modulated pulses generated by allowing the first and second electrical pulses to partially overlap each other, a second balanced photodetector that converts third and fourth optical pulses with the delayed time interval into third and fourth electrical pulses through third and fourth photodiodes, and outputs a second modulated pulse generated by allowing the third and fourth electrical pulses to partially overlap each other, and a capacitor. The capacitor is charged by the first modulated pulse, is discharged by the second modulated pulse, and outputs a voltage according to the charging and discharging as a clock signal.

Claims14

Dependent claims

A low-jitter digital clock signal generating system which uses optical pulses output from a pulse laser, comprising:

a first balanced photodetector configured to receive a first optical pulse and a second optical pulse with a delayed time interval, to convert the first optical pulse and the second optical pulse into a first electrical pulse and a second electrical pulse through a first photodiode and a second photodiode, and to output a first modulated pulse generated by allowing the first electrical pulse and the second electrical pulse to partially overlap each other;
a second balanced photodetector configured to receive a third optical pulse and a fourth optical pulse with the delayed time interval, to convert the third optical pulse and the fourth optical pulse into a third electrical pulse and a fourth electrical pulse through a third photodiode and a fourth photodiode, and to output a second modulated pulse generated by allowing the third electrical pulse and the fourth electrical pulse to partially overlap each other;
and
a capacitor, wherein the capacitor is charged by the first modulated pulse, is discharged by the second modulated pulse, and outputs a voltage according to the charging and discharging as a clock signal.

1 more element

A low-jitter digital clock signal generating system which uses optical pulses output from a pulse laser, comprising:

a first balanced photodetector configured to convert optical pulses having adjusted powers and delay difference into current pulses through photoelectric conversion and to output a first modulated pulse generated by allowing the current pulses to overlap each other;
a second balanced photodetector having the same structure as the first balanced photodetector, and configured to output a second modulated pulse, which has the same magnitude as the first modulated pulse and is in an opposite direction to the first modulated pulse, with the first modulated pulse and the second modulated signal having a given time interval;
and
a capacitor, wherein the capacitor is charged by the first modulated pulse, is discharged by the second modulated pulse, and outputs a voltage according to the charging and discharging as a clock signal.

1 more element

Dependencies are inferred from the claim text.

System for generating low-jitter digital clock signals using pulsed laser

Life of this patent

System for generating low-jitter digital clock signals using pulsed laser

Life of this patent

Abstract

Claims14