Zhejiang University

Bo Cong

Xiaofeng Jin

Xianbin Yu

Xiangdong Jin

Shilie Zheng

Xianmin Zhang

Qinggui Tan

Kang Xiao

Chenghui Zhang

Changqiao Liu

Jichen Qiu

Donglin Qin

A measurement device for polarization-maintaining optical fiber spindle difference delay is provided. The measurement device comprises a polarization-maintaining fiber (PM) Sagnac interferometer, a signal generator, a microwave detector, a microprocessor. The PM Sagnac interferometer comprises a laser, a photoelectric modulator, and a PM fiber coupler that are connected in sequence. The PM Sagnac interferometer further comprises an optical fiber interface Jand an optical fiber interface Jarranged at the two output ends of the PM fiber coupler, a PM fiber to be measured located between the fiber interface Jand the fiber interface J, and a photodetector arranged at the other output end of the PM fiber coupler.

Measuring device for polarization-maintaining optical fiber spindle differential delay

A frequency chirp correction method for the photonic time-stretch system comprises acquiring the stretching signal, i.e. acquiring the time-domain data after the time-domain stretching. First, the time-domain data of the stretching signal is Fourier transformed to obtain the spectral distribution. The spectral distribution is then convoluted with the first frequency-domain correction factor, and then multiplied with the second frequency-domain correction factor to obtain the modified frequency spectrum. Finally, the modified frequency spectrum is performed by the inverse Fourier transform to obtain the time-domain signal after the frequency chirp correction.

Frequency chirp correction method for photonic time-stretch system

A photonic radio-frequency receiver with mirror frequency suppression function, in which a single modulator is utilized to form a photoelectric oscillator so as to generate high-quality and low-phase-noise optically generated local oscillators, without the need for an external local oscillator source, and at the same time, another radio-frequency port is used as a radio-frequency signal input port, thereby allowing a compact structure. By properly setting a bias point for the two-electrode modulator and orthogonally synthesizing two branches of intermediate frequency signals respectively generated by the upper and lower sideband beat frequencies of the modulated optical signal, the photonic radio-frequency receiver realizes the functions of receiving radio-frequency signals and suppressing mirror frequency signals. The present disclosure can realize a photonic mirror-frequency suppression receiver.

Photonic radio-frequency receiver with mirror frequency suppression function

Growing community of inventors

Hangzhou, China

Bo Cong