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Photonic-Assisted Ultrawideband Pulse Generator With Tunable Notch Filtering Based on Polarization-to-Intensity Conversion

Figure 1

Figure 1
Equivalent model and schematic diagram of polarization-to-intensity converter (PIC), PolM: Polarization Modulator, PC: Polarization Controller, PBS: Polarization Beam Splitter, PBC: Polarization Beam Combiner, TE mode: transverse electric mode, TM mode: transverse magnetic mode.

Figure 2

Figure 2
Transfer response curves of the PIC as Formula$\alpha = 45^{\circ}$ or 135° and schematic diagram for generating the chirp-free UWB pulse with a particular profile.

Figure 3

Figure 3
(a) Equivalent model of a negative-coefficient two-tap notch filter and (b) transfer response curves at different time delay.

Figure 4

Figure 4
Experimental setup for photonic-assisted generation and tunable notch filtering of the UWB signals based on nonlinear operated PIC. LD: Laser diode, PolM: Polarization Modulator, PC: Polarization Controller, PPG: Pulse pattern generator, LPF: Low-pass filter, EA: Electrical amplifier, PBS: Polarization Beam Splitter, VOA: Variable optical attenuator, ODL: Optical delay line, PBC: Polarization Beam Combiner, PD: Photodetector, Osc: Oscilloscope, ESA: electrical spectrum analyzer.

Figure 5

Figure 5
Optical spectra, waveforms, and power spectra of the polarity-reversed doublet-like pulses output from the (a) arm of TE mode and the (b) arm of TM mode as Formula$\alpha = 45^{\circ}$ and Formula$\varphi_{0} = 2$.

Figure 6

Figure 6
Waveforms of the power spectra of the synthesized UWB pulse as (a) Formula$\alpha = 45^{\circ}$ and Formula$\tau = 62.5\ \hbox{ps}$ and (b) Formula$\alpha = 45^{\circ}$ and Formula$\tau = 200\ \hbox{ps}$.

Figure 7

Figure 7
Waveforms of the synthesized UWB pulse as (a) Formula$\alpha = 135^{\circ}$ and Formula$\tau = 62.5\ \hbox{ps}$ and (b) Formula$\alpha = 135^{\circ}$ and Formula$\tau = 200\ \hbox{ps}$.

Figure 8

Figure 8
Position of the second notch band varied as a function of relative time delay Formula$\tau$.