A novel optoelectronic oscillator based on all optical signal processing

Frequency Scanning Multibeamforming Method Based on CFBG Photonic Microwave Oscillation

“…Te system design block diagram is shown in Figure 3. Te frequency source (inside the dashed boxed) is given by a CFBG-based two-loop photoelectric oscillator [8], which is mainly composed of a light source, a polarizer, a polarization combiner, single mode fbers, a photodiode, a radio frequency amplifer, a chirped grating, and a Mach-Zehnder external modulator (MZM) [9][10][11][12][13]. Te tuneable photoelectric oscillator can be tuned by using a chirped fber Bragg grating (CFBG) as a photonic flter to select the frequency of the oscillation mode [14][15][16].…”

Generation of Widely Tunable Narrow-Linewidth Photonic Microwave Signals Based on an Optoelectronic Oscillator Using an Optically Injected Semiconductor Laser as the Active Tunable Microwave Photonic Filter

“…because of its unique advantages such as high-frequency, high-speed longdistance low-loss data transmission, immunity to electromagnetic interference, wavelength division multiplexing (WDM) capability [4]- [6]. A considerable number of schemes for generating photonic microwave have been proposed and developed, including direct current modulation [7], mode-locked laser [8], dual-mode laser [9], [10], optical heterodyne [11], [12], optoelectronic oscillator (OEO) [13], [14] etc. In the past years, the scheme based on OEO receives more attention since the generated photonic microwave signals possess extremely low phase noise, high stability and high spectral purity [13].…”

“…A conventional OEO is essentially an optoelectronic feedback loop, including a laser source, an intensity modulator (IM), a long fiber, a photodetector (PD), an electrical bandpass filter (EBPF) and an electrical amplifier (EA). When the loop gain is larger than the loss and the roundtrip phase shift of signal is an integer multiple of 2π, the OEO will start to oscillate at one of its eigenmodes determined by the central frequency of the EBPF [14]. A very long fiber (high-Q cavity) is used to ensure a very low phase noise, but it also results in a small mode interval between two adjacent eigenmodes.…”

Theorical and numerical analysis of an all‐optical delta‐sigma modulator

“…The switching unit in our design controls the sampling frequency as well as its dynamic range. The best switching speed for this kind of switch was predicted to be 50 ps . Data rate scaling to tens of GS/s operation is possible due to the high dynamic range of these A/D converters .…”