Analog-digital conversion method and analog-digital converter
AssigneeNTT, Inc.
InventorsShota Kita, Masaya Notomi, Kengo Nozaki, Akihiko Shinya
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Abstract
An analog-digital conversion method according to the present invention is a method for converting an optical analog signal into an electrical digital signal, the method including: performing at least one of affine transformation with first reference light and homodyne detection with a detection axis of second reference light on the optical analog signal; converting the optical analog signal subject to transformation or detection into an electrical analog signal by photoelectric conversion; and converting the electrical analog signal into an electrical digital signal by thresholding.
Claims14
An analog-digital conversion method, the method comprising:
- performing first processing on an optical analog signal to obtain a processed optical analog signal, the first processing including affine transformation with first reference light or homodyne detection with a detection axis of second reference light;
- converting the processed optical analog signal into an electrical analog signal by photoelectric conversion;
- and
- performing thresholding on the electrical analog signal to convert the electrical analog signal into an electrical digital signal, wherein,
- the first processing includes performing the homodyne detection by varying a phase of the second reference light, and
- the first processing includes performing the affine transformation by varying an amplitude of the first reference light and the homodyne detection with two phases having a phase difference of π/2 therebetween.
An analog-digital converter, comprising:
- a first reference light generation circuit configured to generate first reference light;
- a computing circuit configured to perform first processing on an optical analog signal, wherein the first processing comprises affine transformation with the first reference light or homodyne detection with a detection axis of second reference light;
- and
- a conversion circuit configured to perform thresholding on the optical analog signal to convert the optical analog signal into an electrical digital signal, wherein,
- the first processing includes performing the homodyne detection by varying a phase of the second reference light, and
- the first processing includes performing the affine transformation by varying an amplitude of the first reference light and the homodyne detection with two phases having a phase difference of π/2 therebetween.
An analog-digital conversion method, the method comprising:
- performing first processing on an optical analog signal to obtain a processed optical analog signal, the first processing including affine transformation with first reference light or homodyne detection with a detection axis of second reference light;
- converting the processed optical analog signal into an electrical analog signal by photoelectric conversion;
- and
- performing thresholding on the electrical analog signal to convert the electrical analog signal into an electrical digital signal,
- wherein,
- the first processing includes performing the affine transformation by varying an amplitude of the first reference light, and
- the first processing includes performing the homodyne detection with two phases having a phase difference of π/2 therebetween.
An analog-digital converter, comprising:
- a first reference light generation circuit configured to generate first reference light;
- a computing circuit configured to perform first processing on an optical analog signal, wherein the first processing comprises affine transformation with the first reference light;
- and
- a conversion circuit configured to perform thresholding on the optical analog signal to convert the optical analog signal into an electrical digital signal,
- wherein,
- the first processing includes performing the affine transformation by varying an amplitude of the first reference light, and
- the first processing includes performing homodyne detection with two phases having a phase difference of π/2 therebetween.
Dependencies are inferred from the claim text.