Terahertz laser polarization modulation and demodulation device and realization method thereof

A polarization modulation and laser modulator technology, applied in the field of terahertz applications, can solve the problems of unrealized and lack of polarization modulation technology in the THz frequency band, and achieve the effect of excellent signal-to-noise ratio and fast modulation and demodulation

Active Publication Date: 2016-03-23
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

Polarization modulation is a common method in optical communication. Due to the lack of effective external modulators and corresponding modulation methods, so far, the communication technology in the THz frequency ba

Method used

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  • Terahertz laser polarization modulation and demodulation device and realization method thereof
  • Terahertz laser polarization modulation and demodulation device and realization method thereof
  • Terahertz laser polarization modulation and demodulation device and realization method thereof

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Embodiment 1

[0059] see figure 1 , the present invention provides a polarization modulation and adjustment device for terahertz laser, the polarization modulation and adjustment device for terahertz laser at least includes: a driving power supply 11, a terahertz quantum cascade laser 12, a first off-axis parabolic mirror 13, a linear polarization Laser modulator 2, a second off-axis parabolic mirror 31, a terahertz quantum well detector 32, a current amplifier 33 and an oscilloscope 34; the terahertz quantum cascade laser 12 is connected to the drive power supply 11, suitable for use in the The terahertz linearly polarized laser is radiated under the driving signal of the driving power supply 12; the first off-axis parabolic mirror 13 is located on one side of the terahertz quantum cascade laser 12, and is suitable for collecting the terahertz quantum cascade laser 12 emits linearly polarized laser light, and changes the collected linearly polarized laser light into parallel linearly polar...

Embodiment 2

[0074] see Figure 7 The present invention also provides a method for implementing polarization modulation and mediation of terahertz lasers using the polarization modulation and mediation device for terahertz lasers as described in Embodiment 1, wherein the method includes the steps of:

[0075] 1) keep the polarization direction of the output laser of the terahertz quantum cascade laser 12 parallel to the polarization selection direction of the laser light by the terahertz quantum well detector 32, and place it at the transmitting end and receiving end of the optical path, in this embodiment , the polarization directions of the two are both vertical directions; using the driving power supply to apply a stable 8V DC bias to the terahertz quantum cascade laser, so that the terahertz quantum cascade laser outputs a stable vertical direction Linearly polarized laser, the frequency of the linearly polarized laser is 2.9THz;

[0076] 2) The outputted linearly polarized laser is r...

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Abstract

The invention provides a terahertz laser polarization modulation and demodulation device and a realization method thereof. The terahertz laser polarization modulation and demodulation device comprises a driving power supply, terahertz quantum cascaded laser devices, a first off-axis parabolic mirror, a linear polarization laser modulator, a second off-axis parabolic mirror, a terahertz quantum well detector, a current amplifier and an oscilloscope. The terahertz laser quantum cascaded laser devices are adopted to act as ideal linear polarization laser sources, and the selection characteristic of the terahertz quantum well detector for linear polarization laser is utilized so that the whole device does not require additional polarizers or depolarizers, the polarization extinction ratio of the device is great than 1000, and a communication system using the polarization modulation device is enabled to have excellent signal-to-noise ratio. Besides, a linear polaroid is rapidly rotated at a certain speed, and the periodic change of polarization direction is converted into the change of polarization light signals along with time so that speed of polarization modulation and demodulation can be fully met, rapid signal modulation and demodulation can be realized, and thus a wireless communication technological means based on polarization modulation and demodulation is provided for the terahertz frequency band.

Description

technical field [0001] The invention belongs to the technical field of terahertz applications, and in particular relates to a polarization modulation and adjustment device for terahertz lasers and an implementation method thereof. Background technique [0002] With the increasing frequency of human activities, people's demand for communication speed and communication capacity is increasing, and the frequency of human communication is gradually approaching the terahertz (THz) frequency band. THz wireless communication technology is considered to be an important development direction for next-generation communication applications. . Polarization modulation is a common method in optical communication. Due to the lack of effective external modulators and corresponding modulation methods, so far, the communication technology in the THz frequency band has adopted the direct modulation (internal modulation) method, and the polarization modulation technology in the THz frequency ban...

Claims

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Application Information

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IPC IPC(8): G02B26/00G02B26/02
CPCG02B26/00G02B26/04
Inventor 谭智勇曹俊诚
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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