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US 2018/0003560 A1Published application
Methods and apparatus for multi-probe photonic time-stretch spectral measurements
AssigneesThe Regents of the University of California, Time Photonics, Inc.
InventorsMohammadHossein Asghari, Bahram Jalali, Paul Trinh
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Abstract
Methods and apparatus for multi-probe photonic time-stretch spectral measurements are described. Methods allow for capturing real-time and single-shot non-overlapping spectral bands from multiple probes simultaneously, using Time-Stretch Dispersive Fourier Transform (TS-DFT) systems combined with Wavelength Division Multiplexing (WDM) device.
Claims19
An apparatus to perform spectral measurements of real-time and single-shot spectral bands from multiple probes simultaneously, comprising:
- a polarization device to receive an input signal and output an optical signal having a first polarization state, and
- at least one Wavelength Division Multiplexing (WDM) device to split a short pulse spectrum into one or more individual spectral bands, and
- an optical coupler to split an input optical source signal into a first optical signal communicated on at least one main channel and a second optical signal communicated on one secondary channel;
- at least one Time-Stretch Dispersive Fourier Transform (TS-DFT) system, coupled to the at least one main channel, to stretch the first optical signal in time, to generate at least one main optical signal;
- a secondary delay channel, coupled to the secondary channel, to generate a delayed reference optical signal based on the second optical signal;
- one or more photodetectors, coupled to the at least one main channel and the optional secondary delay channel, wherein the at least one main optical signal are converted to at least one main electrical signal and the delayed reference optical signal is converted to a delayed reference electrical signal;
- an analog-to-digital converter to receive the at least one main electrical signal and the delayed reference electrical signal to at least one digital main electrical signal and at least one digital delayed electrical signal;
- and
- a digital post processing system, to process the at least one digital main electrical signal and the digital delayed electrical signal, to calculate an input optical spectrum received from multiple probes, and to extract absolute wavelength information related to the spectrum received from multiple probes.
6 more elements
An apparatus to perform spectral measurements of real-time and single-shot spectral bands from multiple probes simultaneously, comprising:
- a polarization device to receive an input signal and output an optical signal with a first polarization state;
- at least two Wavelength Division Multiplexing (WDM) devices to introduce multiple time delays among at least two WDM signals to capture corresponding signal interference at different time ranges for the at least two WDM signals;
- an optical coupler to split an input optical source signal into at least one main optical channel and at least one secondary channel, a first optical signal communicated on at the least one main channel and a second optical signal communicated on the secondary channel, and
- at least one Time-Stretch Dispersive Fourier Transform (TS-DFT) system, coupled to the at least one main optical channel, to stretch the first optical signal in time to generate at least one main optical signal, and
- a secondary delay channel coupled to the secondary channel to generate a delayed reference optical signal based on the second optical signal, and
- one or more photodetectors coupled to the at least one main channel and the optional secondary delay channel, wherein the at least one main optical signal is converted to at least one main electrical signal and a delayed reference optical signal is converted to a delayed reference electrical signal, and
- an analog-to-digital converter to receive the at least one main electrical signal and the delayed reference electrical signal, to convert the at least one main electrical signals to at least one digital main electrical signal, and to convert the delayed reference electrical signal to a digital delayed electrical signal;
- and
- a digital post processing system to process the at least one digital main electrical signal and the digital delayed electrical signal, to calculate an input optical spectrum received from multiple probes, and to extract absolute wavelength information related to the input optical spectrum received from the multiple probes.
6 more elements
Dependencies are inferred from the claim text.