Limits...
Ultra High-Speed Radio Frequency Switch Based on Photonics.

Ge J, Fok MP - Sci Rep (2015)

Bottom Line: Microwave switches, or Radio Frequency (RF) switches have been intensively used in microwave systems for signal routing.Compared with the fast development of microwave and wireless systems, RF switches have been underdeveloped particularly in terms of switching speed and operating bandwidth.The RF switch has a wide operation bandwidth of 12 GHz and can go up to 40 GHz, depending on the bandwidth of the modulator used in the scheme.

View Article: PubMed Central - PubMed

Affiliation: Lightwave and Microwave Photonic Laboratory, College of Engineering, The University of Georgia.

ABSTRACT
Microwave switches, or Radio Frequency (RF) switches have been intensively used in microwave systems for signal routing. Compared with the fast development of microwave and wireless systems, RF switches have been underdeveloped particularly in terms of switching speed and operating bandwidth. In this paper, we propose a photonics based RF switch that is capable of switching at tens of picoseconds speed, which is hundreds of times faster than any existing RF switch technologies. The high-speed switching property is achieved with the use of a rapidly tunable microwave photonic filter with tens of gigahertz frequency tuning speed, where the tuning mechanism is based on the ultra-fast electro-optics Pockels effect. The RF switch has a wide operation bandwidth of 12 GHz and can go up to 40 GHz, depending on the bandwidth of the modulator used in the scheme. The proposed RF switch can either work as an ON/OFF switch or a two-channel switch, tens of picoseconds switching speed is experimentally observed for both type of switches.

No MeSH data available.


Related in: MedlinePlus

Demonstration of the high-speed tunable MWP notch filter.(a) Experimental setup of the PM-LMF based MWP notch filter. DFB: distributed feedback laser; DDMZM: dual-drive Mach-Zehnder modulator; PM: phase modulator; PMF: polarization maintaining fiber; PC: polarization controller; PD: photo detector. (b) Measured transmission optical spectra of the tunable PM-LMF at different tuning voltages.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4660296&req=5

f2: Demonstration of the high-speed tunable MWP notch filter.(a) Experimental setup of the PM-LMF based MWP notch filter. DFB: distributed feedback laser; DDMZM: dual-drive Mach-Zehnder modulator; PM: phase modulator; PMF: polarization maintaining fiber; PC: polarization controller; PD: photo detector. (b) Measured transmission optical spectra of the tunable PM-LMF at different tuning voltages.

Mentions: The experimental setup of the MWP notch filter is shown in Fig. 2a. An input RF signal is modulated onto an optical carrier using a 12-GHz dual-drive Mach-Zehnder modulator (DDMZM) via a 90-degree electrical hybrid coupler. A SSB modulated signal is generated by properly adjusting the biases of the upper and lower branches of the DDMZM. The generated SSB signal is then amplified and launched into a phase modulator based loop mirror filter (PM-LMF), as shown in the dashed box in Fig. 2a, through a 3-dB optical coupler for optical spectral filtering. The PM-LMF is used as a high-speed tunable optical notch filter for blocking the corresponding unwanted frequency portion of the RF signal from the SSB. The filtered optical signal is then detected by a photodetector and is converted back to an electrical RF signal. The resultant RF spectrum can be measured by an electrical spectrum analyzer, while the filter profile of the MWP notch filter is measured by an electrical network analyzer. Detailed specifications of major equipment and components used in the experiment can be found in the supplementary information.


Ultra High-Speed Radio Frequency Switch Based on Photonics.

Ge J, Fok MP - Sci Rep (2015)

Demonstration of the high-speed tunable MWP notch filter.(a) Experimental setup of the PM-LMF based MWP notch filter. DFB: distributed feedback laser; DDMZM: dual-drive Mach-Zehnder modulator; PM: phase modulator; PMF: polarization maintaining fiber; PC: polarization controller; PD: photo detector. (b) Measured transmission optical spectra of the tunable PM-LMF at different tuning voltages.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660296&req=5

f2: Demonstration of the high-speed tunable MWP notch filter.(a) Experimental setup of the PM-LMF based MWP notch filter. DFB: distributed feedback laser; DDMZM: dual-drive Mach-Zehnder modulator; PM: phase modulator; PMF: polarization maintaining fiber; PC: polarization controller; PD: photo detector. (b) Measured transmission optical spectra of the tunable PM-LMF at different tuning voltages.
Mentions: The experimental setup of the MWP notch filter is shown in Fig. 2a. An input RF signal is modulated onto an optical carrier using a 12-GHz dual-drive Mach-Zehnder modulator (DDMZM) via a 90-degree electrical hybrid coupler. A SSB modulated signal is generated by properly adjusting the biases of the upper and lower branches of the DDMZM. The generated SSB signal is then amplified and launched into a phase modulator based loop mirror filter (PM-LMF), as shown in the dashed box in Fig. 2a, through a 3-dB optical coupler for optical spectral filtering. The PM-LMF is used as a high-speed tunable optical notch filter for blocking the corresponding unwanted frequency portion of the RF signal from the SSB. The filtered optical signal is then detected by a photodetector and is converted back to an electrical RF signal. The resultant RF spectrum can be measured by an electrical spectrum analyzer, while the filter profile of the MWP notch filter is measured by an electrical network analyzer. Detailed specifications of major equipment and components used in the experiment can be found in the supplementary information.

Bottom Line: Microwave switches, or Radio Frequency (RF) switches have been intensively used in microwave systems for signal routing.Compared with the fast development of microwave and wireless systems, RF switches have been underdeveloped particularly in terms of switching speed and operating bandwidth.The RF switch has a wide operation bandwidth of 12 GHz and can go up to 40 GHz, depending on the bandwidth of the modulator used in the scheme.

View Article: PubMed Central - PubMed

Affiliation: Lightwave and Microwave Photonic Laboratory, College of Engineering, The University of Georgia.

ABSTRACT
Microwave switches, or Radio Frequency (RF) switches have been intensively used in microwave systems for signal routing. Compared with the fast development of microwave and wireless systems, RF switches have been underdeveloped particularly in terms of switching speed and operating bandwidth. In this paper, we propose a photonics based RF switch that is capable of switching at tens of picoseconds speed, which is hundreds of times faster than any existing RF switch technologies. The high-speed switching property is achieved with the use of a rapidly tunable microwave photonic filter with tens of gigahertz frequency tuning speed, where the tuning mechanism is based on the ultra-fast electro-optics Pockels effect. The RF switch has a wide operation bandwidth of 12 GHz and can go up to 40 GHz, depending on the bandwidth of the modulator used in the scheme. The proposed RF switch can either work as an ON/OFF switch or a two-channel switch, tens of picoseconds switching speed is experimentally observed for both type of switches.

No MeSH data available.


Related in: MedlinePlus