High-speed modulation method and device for terahertz quantum cascade laser

A quantum cascade and laser technology, applied in the direction of laser devices, semiconductor laser devices, lasers, etc., can solve the problem of small threshold voltage of AC impedance, achieve the effect of small output impedance and avoid shape changes

Active Publication Date: 2014-07-16
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high-speed modulation method and device for a terahertz quantum cascade laser, which is used to solve the problem that the driver chip in the prior art cannot respond to small AC impedance, threshold voltage High-speed and intensive modulation of terahertz quantum cascade lasers with high drive current

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  • High-speed modulation method and device for terahertz quantum cascade laser

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Embodiment 1

[0032] The invention provides a high-speed modulation device of a terahertz quantum cascade laser, such as figure 1 As shown, the modulation device at least includes: a buffer amplifier, a T-type bias device and a terahertz quantum cascade laser.

[0033] The buffer amplifier is a unity gain amplifier with low output impedance, high output current, and high unity gain bandwidth. The buffer amplifier has a strong load capacity, so as to ensure that it can drive a load with a resistance value below 10Ω.

[0034] Wherein, the output impedance is lower than 1.2Ω, the output current is in the range of 50-200mA, and the unity gain bandwidth is in the range of 50MHz-2.4GHz.

[0035] As an example, the output impedance of the buffer amplifier can be 0.2Ω, 0.3Ω, 0.5Ω, 0.8Ω, 1.0Ω or 1.1Ω, etc.; the output current can be 50mA, 74mA, 100mA or 200mA; the unity gain The bandwidth can be 50MHz, 160MHz, 1.75GHz or 2.4GHz, etc.

[0036] The T-type bias device is a bias device with high band...

Embodiment 2

[0045] This embodiment specifically provides a high-speed modulation device for a terahertz quantum cascade laser, such as figure 1 As shown, the device includes a buffer amplifier, a T-type bias, and a terahertz quantum cascade laser.

[0046] In this embodiment, the buffer amplifier is a unity-gain amplifier built by AD8017 high-speed operational amplifier, with a bandwidth of 160 MHz, an output impedance of 0.2Ω, and a power supply of ±5V.

[0047] In this embodiment, the T-type bias device is a Model 5545-108 Bias-Tee of Picosecond Company, with a bandwidth of 20 GHz, a maximum available DC bias voltage of 50 V, and a maximum output current of 500 mA.

[0048] In this embodiment, the excitation frequency of the terahertz quantum cascade laser is 3.9 THz, the AC impedance is 8Ω, and the threshold voltage is 13V. The operating temperature of the terahertz quantum cascade laser in this embodiment is 10K.

Embodiment 3

[0050] The present invention also provides a high-speed modulation method of a terahertz quantum cascade laser, using the modulation device of the terahertz quantum cascade laser in Embodiment 1 and Embodiment 2 to modulate and drive the terahertz quantum cascade laser, at least including the following steps :

[0051] First, a signal generator is used to input a periodic voltage signal to the buffer amplifier, and a low output impedance and modulated voltage signal are output through the buffer amplifier.

[0052] For example, use a signal generator to input a square wave voltage signal with a peak-to-peak value of 1V and a frequency of 30MHz to the voltage signal input terminal of the buffer amplifier.

[0053] Then, a DC bias signal is input to the DC bias voltage input terminal of the T-type bias device by using a DC voltage stabilizer, and the modulated voltage signal output by the buffer amplifier is superimposed on the DC bias voltage through the T-type bias device On ...

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Abstract

The invention provides a high-speed modulation method and device for a terahertz quantum cascade laser. The device comprises a buffer amplifier, a T-shaped bias device connected with the output end of the buffer amplifier, and the terahertz quantum cascade laser connected with the output end of the T-shaped bias device. The high-speed modulation method for the terahertz quantum cascade laser can carry out high-speed modulation on the terahertz quantum cascade laser large in load, high in threshold voltage and large in drive current, ensure that modulation signals are loaded to the terahertz quantum cascade laser in a distortionless mode, and avoid distortion of impulse waveforms. The device is simple in structure, easy to operate and integrate and suitable for being applied to future THz communication.

Description

technical field [0001] The invention relates to the technical field of application of semiconductor optoelectronic devices, in particular to a high-speed modulation method and device for a terahertz quantum cascade laser. Background technique [0002] Terahertz waves refer to electromagnetic waves with frequencies ranging from 300GHz to 10THz, and frequencies between millimeter waves and infrared light. Due to its own characteristics, terahertz waves have broad application prospects in high-speed communications, imaging, spectrum analysis, and remote sensing. Terahertz Quantum Cascade Laser (THzQCL), which is an important radiation source in the THz frequency band, has been extensively and deeply researched, and important progress has been made. [0003] THz QCL is a coherent THz radiation source with unipolar subband transition, which has the advantages of high energy conversion efficiency, fast response speed, small size, easy integration and long service life. Compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042H01S5/40
Inventor 曹俊诚顾立谭智勇武庆钊王长
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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