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US 10,381,797 B1Granted
Flexible design for a tunable optical filter (TOF) processing block
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsMartin F Ryba, Robert T Carlson, Steven G Santee, Forrest C Vatter
Life of this patent
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Abstract
A flexible TOF processing block having power measurement circuitry comprising separate modules that can be modified using parameterizable registers, without complete reconstruction, allows development to continue while the overall design is optimized.
Claims19
A system for facilitating the design of tunable optical filter circuits, the system comprising:
- a tunable optical filter;
- a tunable optical filter processing block comprising a power input measurement circuit in operative communication with said tunable optical filter, said power measurement input circuit comprising a plurality of modules, and a control logic module in operative communication with said power input measurement circuit;
- and
- at least one parameterizable register in operative communication with said plurality of modules comprising said power input measurement circuit,
- wherein said control logic module is configured to process an input from said power input measurement circuit and indicate how well said tunable optical filter is tuned to a wavelength of interest,
- wherein the behavior of at least one of said plurality of modules in operative communication with said at least one parameterizable register may be altered by changing parameters of said parameterizable register, and
- wherein the tunable optical filter processing block is configured to process power data from the tunable optical filter and measure the amount of light that is modulated at an expected pulse frequency.
4 more elements
A system for facilitating the design of tunable optical filter circuits, the system comprising:
- a tunable optical filter;
- a photodetect diode in operative communication with said tunable optical filter;
- a transimpedance amplifier in operative communication with said photodetect diode;
- at least one nonlinear amplifier in operative communication with said transimpedance amplifier;
- a tunable optical filter processing block comprising a power input measurement circuit in operative communication with said nonlinear amplifier, said power measurement input circuit comprising a plurality of modules, including a Goertzel discrete Fourier transform module in operative communication with a log power calculation module configured to convert a complex result received from the Goertzel discrete Fourier transform module to decibels of optical power, the log power calculation module being in further operative communication with a video averaging module configured to perform smoothing and decimation of power measurements received from the log power calculation module, and a control logic module in operative communication with said power input measurement circuit;
- a log power summing amplifier sample measurement circuit disposed between said at least one nonlinear amplifier and said power input measurement circuit;
- and
- at least one parameterizable register in operative communication with said plurality of modules comprising said power input measurement circuit,
- wherein said control logic module is configured to process an input from said power input measurement circuit and indicate how well said tunable optical filter is tuned to a wavelength of interest,
- wherein the behavior of at least one of said plurality of modules in operative communication with said at least one parameterizable register may be altered by changing parameters of said parameterizable register,
- wherein an output of said control logic module is connected to said tunable optical filter through a differential output digital to analog converter configured to alter the response of the tunable optical filter, and
- wherein said Goertzel discrete Fourier transform comprises an infinite impulse response filter configured to calculate the magnitude of a frequency bin discrete Fourier transform and act as a matched filter for fundamental harmonics relating to the envelope of a pulsed waveform.
9 more elements
A system for facilitating the design of tunable optical filter circuits, the system comprising:
- a tunable optical filter;
- a photodetect diode in operative communication with said tunable optical filter;
- a transimpedance amplifier in operative communication with said photodetect diode;
- at least one nonlinear amplifier in operative communication with said transimpedance amplifier;
- a tunable optical filter processing block comprising a power input measurement circuit in operative communication with said nonlinear amplifier, said power measurement input circuit comprising a plurality of modules, including a Goertzel discrete Fourier transform module in operative communication with a log power calculation module configured to convert a complex result received from the Goertzel discrete Fourier transform module to decibels of optical power, the log power calculation module being in further operative communication with a video averaging module configured to perform smoothing and decimation of power measurements received from the log power calculation module, and a control logic module in operative communication with said power input measurement circuit;
- an analog to digital converter disposed between said at least one nonlinear amplifier and said power input measurement circuit;
- and
- at least one parameterizable register in operative communication with said plurality of modules comprising said power input measurement circuit,
- wherein said control logic module is configured to process an input from said power input measurement circuit and indicate how well said tunable optical filter is tuned to a wavelength of interest,
- wherein the behavior of at least one of said plurality of modules in operative communication with said at least one parameterizable register may be altered by changing parameters of said parameterizable register,
- wherein an output of said control logic module is connected to said tunable optical filter through a differential output digital to analog converter configured to alter the response of the tunable optical filter, and
- wherein said Goertzel discrete Fourier transform comprises an infinite impulse response filter configured to calculate the magnitude of a frequency bin discrete Fourier transform and act as a matched filter for fundamental harmonics relating to the envelope of a pulsed waveform.
9 more elements
Dependencies are inferred from the claim text.