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All-fiber-pulse balanced homodyne detection apparatus

A detection device and all-fiber technology, which is applied in the field of continuous variable quantum key distribution system, can solve the problems such as the decrease of polarization degree of polarized light, increase the power and length error of the two output arms of the coupler, and achieve accurate and adjustable bias voltage , Reduce electronic noise and avoid insertion loss

Active Publication Date: 2012-01-11
TAIYUAN SHANDA YUGUANG TECHNOLOGICAL
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AI Technical Summary

Problems solved by technology

No matter what type of existing attenuator and retarder is an independent component, when it is added to the optical system, it will introduce insertion loss, and cause the polarization degree of polarized light to decrease, which increases the power of the two output arms of the coupler and length error

Method used

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  • All-fiber-pulse balanced homodyne detection apparatus
  • All-fiber-pulse balanced homodyne detection apparatus
  • All-fiber-pulse balanced homodyne detection apparatus

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Embodiment Construction

[0019] figure 1 Shown is an all-fiber pulse balance zero-beat detection device, including a 50 / 50 polarization-maintaining fiber coupler 1, an attenuator 2, a sensor 3, a charge amplifier 4 and a shaping amplifier 5; the 50 / 50 polarization-maintaining fiber The coupler is a single-mode polarization-maintaining coupler based on fusion splicing, which is suitable for 1.5μm / 1.3μm and other optical fields. The length error of the two output arms of coupler 1 is less than two millimeters, and the error of output power is less than ±0.5%. A fiber optic connector with a block structure (ADAFC2-PMN from Thorlabs), which has high precision, no insertion loss, and good stability. Connect the one with high output efficiency in the two output arms of fiber coupler 1 to the photodiode with low quantum efficiency in sensor 3; the one with low output efficiency in the output arm is connected to the photodiode with high quantum efficiency in sensor 3 connected; the total efficiency of each ...

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Abstract

The invention provides an all-fiber-pulse balanced homodyne detection apparatus. The all-fiber-pulse balanced homodyne detection apparatus, which is based on a low noise charge sensitive preamplifier, can be used to accurately measure a quadrature component of a weak coherent light field. The apparatus comprises: a 50 / 50 polarization-maintaining fiber coupler (1), an attenuator (2), a sensor (3), a charge amplifier (4) and a shaping amplifier (5). In the invention, the attenuator is skillfully combined with a tail fiber of the coupler so that negative factors, such as insertion loss, decrease of a degree of polarization and the like, can be avoided. Continuous accurate attenuation of light intensity can be realized. And stability is good. The detection apparatus is all-fiber, possesses a compact structure, a narrow output pulse width, low electronics noise, high quantum efficiency and can run stably for a long time.

Description

technical field [0001] The invention relates to a continuous variable quantum key distribution system, in particular to an all-fiber pulse balance zero-beat detection device for precise measurement of an orthogonal component of a weakly coherent state light field. Background technique [0002] The pulse-balanced zero-beat detection device can precisely measure the orthogonal components of the light field in the time domain, and is widely used in quantum optics, quantum information and other fields. Compared with the balanced zero-beat detector in the frequency domain, it has higher technical requirements, and needs to have a larger bandwidth (at least to be able to distinguish each incident optical pulse signal), and at the same time require a high common-mode rejection ratio, flat Gain curve and extremely low electronic noise (especially in the low frequency band). For the all-fiber continuous variable quantum key distribution system, the pulse-balanced zero-beat detection...

Claims

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Application Information

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IPC IPC(8): G01J11/00G01J1/42
Inventor 王旭阳李永民白增亮苏静
Owner TAIYUAN SHANDA YUGUANG TECHNOLOGICAL
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