US 11,689,294 B2 · Optical receiver

Abstract

[Problem] An optical receiver using a polarization demultiplexing technique is miniaturized. [Solution] An optical receiver 100A for receiving a polarization multiplexed signal obtained by performing orthogonal polarization multiplexing on two optical signals. The optical receiver includes an IL 1 splitting the polarization multiplexed signal into two transmitted signals that are asymmetric in terms of a light transmission characteristic, O/Es 2a and 2b converting the transmitted signals resulting from the split into electrical signals, a downsampler 3 downsampling the electrical signals resulting from the conversion to generate low-speed digital signals, a calculator 4 calculating coefficients of a polarization separation matrix from the resultant low-speed digital signals, a level adjuster 5A adjusting, in accordance with the coefficients resulting from the calculation, signal levels of the electrical signals resulting from the conversion to generate a plurality of adjustment signals, adders 6Aa and 6Ab adding the generated adjustment signals to generate addition signals, and discriminators 7a and 7b restoring and extracting the two optical signals from the generated addition signals.

Claims8

Dependent claims

An optical receiver configured to receive a polarization multiplexed signal obtained by performing orthogonal polarization multiplexing on two optical signals, the optical receiver comprising:

an interleaver configured to split the polarization multiplexed signal into two transmitted signals that are asymmetric in terms of a light transmission characteristic;
an optical/electrical converter configured to convert the transmitted signals resulting from the split into electrical signals;
an A/D converter configured to convert, into digital signals, the electrical signals being analog signals, and configured to downsample the electrical signals to generate low-speed digital signals;
a calculator configured to calculate coefficients of a polarization separation matrix from the generated low-speed digital signals;
a level adjuster configured to adjust, in accordance with the coefficients resulting from the calculation, signal levels of the electrical signals resulting from the conversion to generate a plurality of adjustment signals;
an adder configured to add the generated adjustment signals to generate addition signals, wherein the level adjuster and the adder are configured as an analog circuit configured to process the electrical signals;
and
a discriminator configured to restore and extract the two optical signals from the generated addition signals.

5 more elements

An optical transmission system comprising:

an optical transmitter;
an optical receiver configured to receive a polarization multiplexed signal obtained by performing orthogonal polarization multiplexing on two optical signals, the optical receiver comprising:
an interleaver configured to split the polarization multiplexed signal into two transmitted signals that are asymmetric in terms of a light transmission characteristic;
an optical/electrical converter configured to convert the transmitted signals resulting from the split into electrical signals;
an A/D converter configured to convert, into digital signals, the electrical signals being analog signals, and configured to downsample the electrical signals to generate low-speed digital signals;
a calculator configured to calculate coefficients of a polarization separation matrix from the generated low-speed digital signals;
a level adjuster configured to adjust, in accordance with the coefficients resulting from the calculation, signal levels of the electrical signals resulting from the conversion to generate a plurality of adjustment signals;
an adder configured to add the generated adjustment signals to generate addition signals, wherein the level adjuster and the adder are configured as an analog circuit configured to process the electrical signals;
and
a discriminator configured to restore and extract the two optical signals from the generated addition signals.

7 more elements

Dependencies are inferred from the claim text.

Optical receiver

Life of this patent

Optical receiver

Life of this patent

Abstract

Claims8