研究目的
Investigating the implementation and performance enhancement of a single bandpass microwave photonic filter (MPF) based on a gain-switched distributed feedback (DFB) laser.
研究成果
A single bandpass MPF based on a gain-switched DFB laser was successfully implemented, with tunable passband from 1 GHz to 39 GHz and a 3-dB bandwidth of about 950 MHz. The introduction of super-continuum generation improved the MPF's performance, reducing the 3-dB bandwidth to about 230 MHz. Experimental results agreed well with numerical simulations.
研究不足
The performance of the MPF is limited by the bandwidth of the optical source and the complexity introduced by additional components for performance enhancement.
1：Experimental Design and Method Selection:
The experiment involves the use of a gain-switched DFB laser, phase modulator (PM), and optical tunable delay line (OTDL) to create a single bandpass MPF. Self-phase modulation (SPM) effect is explored to enhance the performance of the MPF.
2：Sample Selection and Data Sources:
The optical signal from the gain-switched DFB laser is used as the source, with its spectrum and filter response measured.
3：List of Experimental Equipment and Materials:
Equipment includes a DFB laser, PM, OTDL, optical coupler, standard single mode fiber (SMF), erbium-doped fiber amplifier (EDFA), photodetector (PD), and vector network analyzer (VNA).
4：Experimental Procedures and Operational Workflow:
The gain-switched signal is divided into two branches, processed through PM and OTDL, combined, sent through SMF for dispersion, amplified by EDFA, and detected by PD for frequency response measurement.
5：Data Analysis Methods:
The transfer function of the MPF is derived and compared with experimental results to confirm the theoretical model.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
DFB laser
Generates optical pulse with a repetition rate of 2.5 GHz for the MPF.
-
Phase Modulator
PM
Modulates the phase of the optical signal in one branch of the interferometric configuration.
-
Optical Tunable Delay Line
OTDL
Adjusts the delay in one branch of the interferometric configuration to tune the MPF's passband.
-
Optical Coupler
50:50
Divides and combines optical signals in the interferometric configuration.
-
Standard Single Mode Fiber
SMF
Introduces dispersion to the optical signal.
-
Erbium-Doped Fiber Amplifier
EDFA
Amplifies the optical signal after fiber transmission.
-
Photodetector
PD
Detects the amplified optical signal and converts it to an RF signal for measurement.
-
Vector Network Analyzer
VNA
Drives the PM and measures the frequency response of the MPF.
-
登录查看剩余6件设备及参数对照表
查看全部
