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A frequency conversion system, photonics technology, applied in electromagnetic wave transmission system, transmission system, electromagnetic transmitter and other directions, can solve the problems of limited system bandwidth and I/Q balance, avoid frequency dependence, strong operability , the effect of simple structure
Active Publication Date: 2018-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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[0004] Some photonics microwave I / Q down-conversion systems have been publicly reported, but these systems still require frequency-dependent electronic devices such as electric phase shifters and electric couplers, resulting in limited bandwidth and I / Q balance of the system
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Embodiment 1
[0054] Embodiment 1: the laser wavelength that the selected laser produces is 1552.3nm, and optical power is 17dBm; The radio frequency signal that the radio frequency signal source produces frequency 26GHz, power 0dBm; The local oscillator signal that the local oscillator signal source produces frequency 25.9GHz, power 10dBm; PDM- The half-wave voltage of DPMZM is 3.5V, the bandwidth is 30GHz, and the extinction ratio is 30dB; the center wavelength of the optical filter is 1552.6nm, and the 3dB bandwidth is 0.6nm; the 3dB response bandwidth of BPD is 1GHz, and the responsivity is 1.1A / W;
[0055] Test the passband curve of the optical filter, see figure 2 ;
[0056] Adjust the output voltage of the DC voltage source so that the sub-modulators Xa, Xb, Ya, and Yb all work at the minimum point. At this time, the optical signal input to the optical filter mainly includes ±1-order sidebands, carrier and even-order sidebands that are suppressed Optical signal, spectrum see figu...
Embodiment 2
[0060] Embodiment 2: the laser wavelength that the selected laser produces is 1552.3nm, and optical power is 17dBm; The radio frequency signal that the radio frequency signal source produces frequency 36GHz, power 0dBm; The local oscillator signal that the local oscillator signal source produces frequency 17.95GHz, power 18dBm; PDM- The half-wave voltage of DPMZM is 3.5V, the bandwidth is 30GHz, and the extinction ratio is 30dB; the center wavelength of the optical filter is 1552.6nm, and the 3dB bandwidth is 0.6nm; the 3dB response bandwidth of BPD is 1GHz, and the responsivity is 1.1A / W;
[0061] Test the passband curve of the optical filter, see Figure 4 ;
[0062] Adjust the output voltage of the DC voltage source so that the sub-modulators Xa and Xb work at the minimum point, Ya works at the maximum point, Y-DPMZM works at the minimum point, and adjust the Yb working point so that the optical carrier output by the Y-DPMZM is suppressed; at this time The optical signal i...
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Abstract
The invention provides a photonics microwave I / Q down-conversion system, and relates to the technical field of optical fiber communication. The system adopts a polarization division multiplexing dual-parallel Mach-Zehnder modulator to modulate radio frequency and local oscillator signals, and by adjusting the working point of the modulator and performing optical filtering and polarization control,two paths of down-conversion channels with a phase difference of 90 degrees are constructed to achieve the microwave I / Q down-conversion. According to the photonics microwave I / Q down-conversion system provided by the invention, the radio frequency and local oscillator signals are modulated into polarization division multiplexing optical signals, and optical filtering, optical splitting, polarization control and balance detection are performed on the polarization division multiplexing optical signals to achieve the I / Q down-conversion of the radio frequency and local oscillator signals. The photonics microwave I / Q down-conversion system provided by the invention has the advantages of simple structure and high operability; and by adopting the photonics method to realize the orthogonal down-conversion of the two paths, the frequency dependence of an electronic device can be avoided, and the photonics microwave I / Q down-conversion system has the advantages of large bandwidth and high I / Qbalance degree.
Description
technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a microwave I / Q down-conversion system. Background technique [0002] Microwave I / Q downconverter is a common device in modern electronic systems. It is often used for image suppression downconversion, zero-IF reception, phase detection, and frequency detection. The essence of the microwave I / Q down-converter is a pair of down-converters with a phase difference of 90 degrees, consisting of two down-converters and a quadrature coupler. However, due to the frequency dependence of electronic devices, it is difficult for the frequency conversion efficiency of the downconverter to be consistent within a large bandwidth, which leads to the amplitude imbalance problem of the microwave I / Q downconverter; at the same time, it is difficult for the quadrature coupler to guarantee The phase difference is exactly 90 degrees, causing the microwave I / Q downconverter to face...
Claims
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