US 11,112,306 B2 · Real-time optical spectro-temporal analyzer and method

Abstract

An optical signal analyzing apparatus enables real-time and single-shot analysis simultaneously in both time and frequency domains with spectro-temporal analysis. The apparatus includes a fiber tap coupler for receiving an input optical signal from continuous wave (CW) to ultra-short pulses (femtosecond-picosecond). An optical splitter directs part of the signal to a frequency channel and part to a time channel A photodiode in the time channel directly monitors the intensity evolution and converts it to an electrical signal. In the frequency channel, two sub-channels are provided: one for CW/quasi-CW and one for short-pulse components. A signal processor analyses the time- and frequency-domain data from the time channel and frequency channel and displays the temporal and spectral evolutions simultaneously, so that the two different pieces of information of a non-repeated dynamic event can be correlated in different domains.

Claims19

Dependent claims

A versatile optical signal analyzing apparatus that enables real-time and single-shot analysis in both time and frequency domains simultaneously for non-repetitive ultrafast optical events with spectro-temporal analysis, comprises:

a fiber-tap coupler for receiving an input optical signal from continuous wave (CW) to ultra-short pulses;
an optical splitter which directs part of the input optical signal to a frequency channel and part to a time channel;
a high-speed photodiode in the time channel directly monitors time domain intensity evolution and converts it to an electrical signal;
two sub-channels specified for CW/quasi-CW and short-pulse components form the frequency channel in which spectroscopes determine frequency domain spectral intensity evolution for the CW/quasi-CW and short-pulse components, respectively;
a signal processor that analyses the frequency and time domain intensity evolutions from the time channel and frequency channels;
and
a display of the time domain intensity evolution and frequency domain spectral intensity evolutions simultaneously so that the frequency and time domain evolutions of a non-repeated dynamic event can be correlated in the frequency and time domains.

4 more elements

A method for signal analysis of non-recurring optical phenomenon ranging from ultra-short pulses (femtosecond to picosecond) to quasi-CW in real-time in both time and frequency domains simultaneously for non-repetitive ultrafast optical events with spectral analysis, comprising the steps of:

receiving an input optical signal in the range from ultra-short pulses to CW;
directing part of the input optical signal to a frequency channel and part to a time channel;
directly monitoring with a photodiode in the time channel an intensity evolution of the input optical signal and converting it to an electrical signal;
directing the input optical signal in the frequency channel into two sub-channels specified for CW/quasi-CW and short-pulse components, respectively, one sub channel processes the signal by a time stretch (TS) process and the other processes the signal by a parametric time-lens (TL) imaging process to form a frequency domain spectral intensity evolution;
analyzing in a processor the time- and frequency-domain intensity evolutions respectively from the time channel and frequency channel;
and
displaying the analyzed time domain and frequency domain intensity spectral evolutions simultaneously so that the frequency and time domain evolutions of a non-recurring dynamic event can be correlated in the frequency and time domains.

4 more elements

Dependencies are inferred from the claim text.

Real-time optical spectro-temporal analyzer and method

Life of this patent

Real-time optical spectro-temporal analyzer and method

Life of this patent

Abstract

Claims19