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US 8,135,288 B2Granted
System and method for a photonic system
AssigneeThe Boeing Company
InventorJames D. Franklin
Life of this patent
Estimating the term…
Abstract
A photonic system and method are provided. The system includes an optical source configured to generate a carrier signal; and a modulator configured to modulate the carrier signal with a radio frequency, (“RF”) input signal to generate a modulated signal. The system also includes an optical filter configured to filter the modulated signal to generate a vestigial sideband modulated signal; and an optical detector configured to demodulate the vestigial sideband signal to generate an RF output signal. The system further includes a wavelength controller module configured to set an operating parameter of the optical source.
Claims24
A photonic system, comprising:
- an optical source configured to generate a carrier signal;
- an optical filter configured to filter the carrier signal to generate a sideband rejected signal;
- an optical circulator configured to receive the sideband rejected signal from the optical filter and to send the sideband rejected signal to a modulator configured to modulate the carrier signal with a radio frequency (“RF”) input signal to generate a modulated signal and to send the modulated signal to the optical circulator, wherein the optical circulator sends the modulated signal in reverse back to the optical filter for further filtering to generate a vestigial sideband modulated signal;
- an optical detector configured to receive the vestigial sideband modulated signal and to demodulate the vestigial sideband modulated signal to generate an RF output signal;
- and
- a wavelength controller module configured to set an operating parameter to control the wavelength by receiving and using a reference signal and a feedback signal to generate a control signal for the optical source, wherein the reference signal includes a portion of the carrier signal, a reflected signal from the optical filter, and the sideband rejected signal, and wherein the feedback signal includes a carrier detected signal of the vestigial sideband modulated signal, and the RF output signal.
3 more elements
A photonic system, comprising:
- an optical source configured to generate a carrier signal;
- a first coupler configured to receive the carrier signal from the optical source and generate a first configured carrier signal and a second configured carrier signal;
- a modulator configured to modulate the first configured carrier signal with a radio frequency (“RF”) input signal to generate a modulated signal;
- an optical filter configured to filter the modulated signal to generate a vestigial sideband signal;
- a second coupler configured for receiving a coupled portion of the coupling the vestigial sideband signal and the second configured carrier signal received from the first coupler to generate a first vestigial sideband signal, a second vestigial sideband signal, and a coupled carrier signal;
- a balanced optical detector having a first detector for receiving the first vestigial sideband signal and a second detector for receiving the second vestigial sideband signal, the first detector and the second detector configured for heterodyning the first vestigial sideband signal, the second coupled vestigial sideband signal, and the coupled carrier signal to generate an RF output signal, wherein a relative intensity noise (RIN) of the coupled carrier signal is cancelled by a one hundred and eighty degree phase shift due to a combination of the second coupler, the first detector, and the second detector;
- and
- a wavelength controller module configured to set an operating parameter to control the wavelength by receiving and using a reference signal and a feedback signal to generate a control signal for the optical source to generate the carrier signal, wherein the reference signal includes a coupled portion of the carrier signal, a modulated signal from the modulator, and a reflected modulated signal from the optical filter, and wherein the feedback signal includes a carrier detected signal of a vestigial sideband modulated signal and a carrier detected output signal of the RF output signal.
5 more elements
A photonic system, comprising:
- an optical source configured to generate a carrier signal;
- a modulator configured to modulate the carrier signal with a radio frequency (RF) input signal to generate a modulated signal;
- an optical filter configured to filter the modulated signal to generate a filtered vestigial sideband signal;
- a local oscillator configured to generate a local oscillator signal;
- a balanced optical detector configured to receive the filtered vestigial sideband signal via a coupler configured for coupling the filtered vestigial sideband signal with the local oscillator signal to generate a first coupled vestigial sideband signal and a second coupled vestigial sideband signal;
- a balanced optical detector having a first detector for receiving the first vestigial sideband signal and a second detector for receiving the second vestigial sideband signal, the first detector and the second detector configured for heterodyning the first vestigial sideband signal and the second vestigial sideband signal with the local oscillator signal to generate a frequency converted RF output signal, wherein a relative intensity noise (RIN) of the local oscillator signal is cancelled by a one hundred and eighty degree phase shift due to a combination of the coupler, the first detector, and the second detector;
- and
- a wavelength controller module configured to set an operating parameter for the optical source, wherein a reference signal includes a coupled portion of the carrier signal, a modulated signal from the modulator, and a reflected modulated signal from the optical filter, and wherein a feedback signal includes a carrier detected signal of a vestigial sideband modulated signal and a carrier detected output signal of the RF output signal.
5 more elements
A method for operating a photonic system, the method comprising:
- (a) generating an optical signal from an optical source;
- (b) modulating the optical signal with an input radio frequency (RF) signal to generate a modulated signal;
- (c) transmitting the modulated signal to an optical filter, wherein the optical filter filters the modulated signal to generate a vestigial sideband signal;
- (d) transmitting the vestigial sideband signal to an optical detector, where the optical detector demodulates the vestigial sideband signal to generate an output RF signal;
- and
- (e) configuring the optical source based on a reference signal and a feedback signal wherein the feedback signal is the RF output signal generated in step (d).
3 more elements
Dependencies are inferred from the claim text.