US 11,563,496 B2 · Phase response measurement method and apparatus

Abstract

An apparatus at least includes a processor to, after a first signal passes through a narrowband photodetector, perform frequency mix of the first signal with a first reference signal and a second reference signal respectively and perform noise reduction, to obtain a first detection signal and a second detection signal. The first signal is obtained after a measurement signal passes through a filtering module of an optical transmitting end, the measurement signal being transmitted in a path of multiple branches, signals not transmitted in other paths of the multiple branches, a frame structure of the measurement signal including at least one two-tone signal, two tones in the two-tone signal having a fixed tone interval. The processor is to calculate group delays at multiple frequency bins according to the first detection signal and the second detection signal; and determine a phase response of the filtering module of the optical transmitting end in the path according to the group delays at multiple frequency bins.

Claims18

Dependent claims

A phase response measurement apparatus, comprising:

a memory to store instructions;
and
a computing hardware coupled to the memory to:
after a first signal passes through a narrowband photodetector, perform frequency mix of the first signal with a first reference signal and a second reference signal respectively and then perform noise reduction, to obtain a first detection signal and a second detection signal;
wherein the first signal is obtained after a measurement signal passes through a filtering module of an optical transmitting end, the measurement signal being transmitted in a path of multiple branches, signals not being transmitted in other paths of the multiple branches, a frame structure of the measurement signal including at least one two-tone signal, two tones in the two-tone signal having a fixed tone interval;
calculate group delays at multiple frequency bins according to the first detection signal and the second detection signal;
and
determine a phase response of the filtering module of the optical transmitting end in the path according to the group delays at multiple frequency bins.

5 more elements

A phase response measurement method, comprising:

transmitting a measurement signal in a path of multiple branches, and not transmitting a signal in other paths of the multiple branches, a frame structure of the measurement signal including at least one two-tone signal, two tones in the two-tone signal having a fixed tone interval;
obtaining a first signal by passing the measurement signal through a filtering module of an optical transmitting end;
after the first signal passes through a narrowband photodetector, performing frequency mixing of the first signal with a first reference signal and a second reference signal respectively and then performing noise reduction, to obtain a first detection signal and a second detection signal;
calculating group delays at multiple frequency bins according to the first detection signal and the second detection signal;
and
determining a phase response of the filtering module of the optical transmitting end in the path according to the group delays at multiple frequency bins.

3 more elements

Dependencies are inferred from the claim text.

Phase response measurement method and apparatus

Life of this patent

Phase response measurement method and apparatus

Life of this patent

Abstract

Claims18