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US 2021/0083776 A1Published application
Light source for quantum communication system, and encoding device
AssigneeQuantumctek Co., Ltd.
InventorYanlin TANG
Life of this patent
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Abstract
Provided are a light source for use in the field of quantum communication, and an encoding device using the light source. When the light source is applied to Z basis encoding, a high and stable extinction ratio can be provided, and two consecutive optical pulses having a stable phase relation can be provided for encoding under an X basis.
Claims21
A light source for performing both time-bin encoding and phase encoding, comprising:
- a master laser configured to output, in response to a master drive signal from a master drive signal source, a master laser pulse during a system period, to form a seed light;
- and
- a slave laser configured to output, under stimulation of the seed light and in response to a slave drive signal from a slave drive signal source, a slave laser pulse in an injection locking manner, to encode a signal light pulse, wherein
- the slave drive signal comprises a first slave drive signal, a second slave drive signal and a third slave drive signal, and one of the first slave drive signal, the second slave drive signal and the third slave drive signal is randomly selected and outputted during the system period, to drive the slave laser, and wherein
- during the system period, the slave laser is configured to:
- output, in response to the first slave drive signal, only one first slave laser pulse, wherein the first slave laser pulse is generated under stimulation of a pulse component of the master laser pulse at a first time position;
- output, in response to the second slave drive signal, only one second slave laser pulse during the system period, wherein the second slave laser pulse is generated under stimulation of a pulse component of the master laser pulse at a second time position;
- and
- output, in response to the third slave drive signal, two successive third slave laser pulses during the system period, wherein the two third slave laser pulses are generated respectively under stimulation of a pulse component of the master laser pulse at a third time position and a pulse component of the master laser pulse at a fourth time position.
6 more elements
(canceled)
An encoding device for performing both time-bin encoding and phase encoding, comprising a light source for performing both time-bin encoding and phase encoding, wherein the light source comprises:
- a master laser configured to output, in response to a master drive signal from a master drive signal source, a master laser pulse during a system period, to form a seed light;
- and
- a slave laser configured to output, under stimulation of the seed light and in response to a slave drive signal from a slave drive signal source, a slave laser pulse in an injection locking manner, to encode a signal light pulse, wherein
- the slave drive signal comprises a first slave drive signal, a second slave drive signal and a third slave drive signal, and one of the first slave drive signal, the second slave drive signal and the third slave drive signal is randomly selected and outputted during the system period, to drive the slave laser, and wherein
- during the system period, the slave laser is configured to:
- output, in response to the first slave drive signal, only one first slave laser pulse, wherein the first slave laser pulse is generated under stimulation of a pulse component of the master laser pulse at a first time position;
- output, in response to the second slave drive signal, only one second slave laser pulse during the system period, wherein the second slave laser pulse is generated under stimulation of a pulse component of the master laser pulse at a second time position;
- and
- output, in response to the third slave drive signal, two successive third slave laser pulses during the system period, wherein the two third slave laser pulses are generated respectively under stimulation of a pulse component of the master laser pulse at a third time position and a pulse component of the master laser pulse at a fourth time position.
6 more elements
Dependencies are inferred from the claim text.