Ultra high-speed photonics based radio frequency switching
View Patent ↗Various examples are provided for radio frequency (RF) switching. In one example, a RF switch includes a dual-drive Mach-Zehnder modulator (DDMZM) that can generate a single-sideband (SSB) signal by modulating an input RF signal onto an optical carrier; a tunable phase modulator incorporated loop mirror filter (PM-LMF) that can optically notch filter the SSB signal in response to a control signal; and a photodetector (PD) that can generate a RF output signal based upon the SSB signal. In another example, a method includes modulating an input RF signal onto an optical carrier to generate a SSB signal; notch filtering the SSB signal by a tunable PM-LMF in response to a control signal; and generating a RF output signal based upon the SSB signal.
1. A radio frequency (RF) switch, comprising:
a dual-drive Mach-Zehnder modulator (DDMZM) configured to generate a single-sideband (SSB) signal by modulating an input RF signal onto an optical carrier;
a tunable phase modulator incorporated loop mirror filter (PM-LMF) configured to optically notch filter the SSB signal in response to a control signal, where the input RF signal comprises a signal at a predefined frequency, and the tunable PM-LMF is configured to turn on or off the signal at the predefined frequency in response to the control signal; and
a photodetector (PD) configured to generate a RF output signal based upon the SSB signal.
2. The RF switch of claim 1 , wherein the tunable PM-LMF turns on or off the signal at the predefined frequency based upon a voltage level of the control signal.
3. The RF switch of claim 1 , wherein the tunable PM-LMF comprises a polarization maintaining fiber (PMF), a polarization controller (PC), and a phase modulator (PM) configured to control operation of the tunable PM-LMF based upon the control signal.
4. The RF switch of claim 3 , wherein switching of the tunable PM-LMF is based upon a Pockels electro-optic effect produced in the PM in response to the control signal.
5. The RF switch of claim 1 , wherein the input RF signal is modulated onto the optical carrier by the DDMZM via a 90-degree hybrid coupler.
6. The RF switch of claim 1 , wherein the control signal comprises a switching period that is less than a nanosecond and a rise-time/fall-time of about 100 picoseconds or less.
7. A radio frequency (RF) switch, comprising:
a dual-drive Mach-Zehnder modulator (DDMZM) configured to generate a single-sideband (SSB) signal by modulating an input RF signal onto an optical carrier;
a tunable phase modulator incorporated loop mirror filter (PM-LMF) configured to optically notch filter the SSB signal in response to a control signal, where the input RF signal comprises a first signal at a first predefined frequency and a second signal at a second predefined frequency, and the tunable PM-LMF is configured to switch between the first signal and the second signal in response to the control signal; and
a photodetector (PD) configured to generate a RF output signal based upon the SSB signal.
8. The RF switch of claim 7 , wherein the control signal comprises a switching period that is less than a nanosecond and a rise-time/fall-time of about 100 picoseconds or less.
9. The RF switch of claim 8 , wherein a switching speed of the RF switch is less than 200 picoseconds.
10. The RF switch of claim 9 , wherein the switching speed is less than 100 picoseconds.
11. The RF switch of claim 7 , wherein the tunable PM-LMF switches between the first signal and the second signal based upon a voltage level of the control signal.
12. The RF switch of claim 7 , wherein the SSB signal is launched into the tunable PM-LMF via an optical coupler.
13. The RF switch of claim 12 , comprising an optical amplifier configured to amplify the SSB signal prior to launching into the tunable PM-LMF.
14. A method, comprising:
modulating an input radio frequency (RF) signal onto an optical carrier to generate a single-sideband (SSB) signal;
notch filtering the SSB signal by a tunable phase modulator incorporated loop mirror filter (PM-LMF) in response to a control signal, wherein the tunable PM-LMF switches between notch filtering at a first frequency and notch filtering at a second frequency in response to the control signal; and
generating a RF output signal based upon the SSB signal.
15. The method of claim 14 , wherein the tunable PM-LMF switches the RF output signal between the first frequency and the second frequency in response to the control signal.
16. The method of claim 15 , wherein the input RF signal comprises a signal at the first frequency and no signal at the second frequency.
17. The method of claim 14 , wherein the notch filtering of the SSB signal is based upon birefringence in a phase modulator (PM) of the tunable PM-LMF and a polarization maintaining fiber (PMF).
18. The method of claim 17 , wherein tuning of the notch filtering is based upon an electro-optic Pockels effect produced in the PM in response to the control signal.
19. The method of claim 14 , wherein the control signal comprises a switching period that is less than a nanosecond and a rise-time/fall-time of about 100 picoseconds or less.
20. The RF switch of claim 7 , wherein the tunable PM-LMF comprises a phase modulator (PM) configured to control operation of the tunable PM-LMF based upon the control signal, and switching of the tunable PM-LMF is based upon a Pockels electro-optic effect produced in the PM in response to the control signal.