Broadband high-speed optical vector analyzer based on cyclic frequency shifter
A technology of analyzer and frequency shifter, applied in the field of broadband high-speed optical vector analyzer, can solve the problems of difficult to meet practical application requirements, long switching time of optical filter, limited measurement bandwidth, etc., to alleviate the accumulation of amplified spontaneous noise , the effect of high spectral resolution and large measurement bandwidth
Pending Publication Date: 2022-04-12
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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However, since this scheme adopts the frequency point-by-point scanning measurement method, and the optical filter used for optical carrier selection takes a long time to switch, it is only suitable for static and low-speed measurement application scenarios
By adopting chirp wave and deskewing receiving technology, the measurement speed of optical vector analyzer can be significantly improved, but its measurement bandwidth is limited by the frequency range of chirp wave, which is only 14.6 GHz, which is difficult to meet the actual application requirements [S. Li, M. Xue, T. Qing, C. Yu, L. Wu, and S. Pan, “Ultrafast and ultrahigh-resolution optical vector analysis using linearly frequency-modulated waveform and dechirp processing,” Optics Letters, 44(13), 3322 –3325 (2019).]
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Embodiment 1
[0053] As an implementation example, only the measurement results when the optical frequency shifter works in a positive frequency shifting state are shown. In the experiment, by controlling the gain of the EDFA (9) and the bandwidth of the optical filter (10) in the cyclic frequency shifter, the chirp optical signal circulates 37 times in the loop, and the corresponding effective measurement bandwidth of the optical vector analyzer is 418 GHz. Figure 5 The magnitude response and phase response of the hydrogen cyanide gas chamber measured by the broadband high-speed optical vector analyzer provided by the present invention are given. The length of the hydrogen cyanide gas chamber is 30 cm, the pressure in the gas chamber is 25 Torr, and the working temperature is 24° C. The measured magnitude and phase responses are as Figure 5 As shown, five absorption peaks can be observed in the measurement range of 418GHz, and the corresponding phase change can be observed at the resona...
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The invention discloses a broadband high-speed optical vector analyzer based on a cyclic frequency shifter, which is characterized in that a high-quality linear frequency modulation optical signal is generated in a linear frequency modulation wave generation module, and hyperfine regulation and control of kHz-magnitude optical frequency are realized, so that high-measurement-speed and high-spectral-resolution optical vector analysis is realized. A cyclic frequency shifter module is introduced, and a low-bandwidth signal generator is adopted to adjust the bias voltage of a dual-parallel Mach-Zehnder modulator, so that high-speed switching of the cyclic frequency shifter module between two working states of positive frequency shift and negative frequency shift is realized, and fine regulation and control of optical frequency in an ultra-wideband frequency spectrum range is realized. Before measurement, the to-be-measured optical device is removed to obtain the calibration signal, and then the to-be-measured optical device is connected to obtain the measurement signal, so that the calibration of the measurement system can be realized, the influence of system noise such as light source power jitter can be eliminated, and the amplitude response and phase response of the to-be-measured optical device can be accurately obtained.
Description
technical field [0001] The invention relates to the technical field of precision optical measurement, in particular to a broadband high-speed optical vector analyzer based on a cyclic frequency shifter. Background technique [0002] With the rapid development of a new generation of optical information systems, including optical communication, optical sensing, and optical processing, various new types of optical devices are widely used for high-precision, multi-dimensional control of optical signals, including amplitude and phase. The spectral response of an optical device is an important parameter to reveal its characteristics, functions and potential applications. During the development, production and application of an optical device, it is necessary to accurately measure the spectral response of an optical device in multiple dimensions. At present, the spectral response measurement technology has not yet matured, and there are still mutual constraints among various perfor...
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Login to View More IPC IPC(8): H04B10/079H04B10/077G02F1/125
Inventor王彬张伟锋刘泉华曾涛龙腾
OwnerBEIJING INSTITUTE OF TECHNOLOGYGY