Ultra-wide band signal generation using digitally jointed dual sidebands and RF up-conversion for single optical carrier transmission

Patent metadata

Field	Value
Publication number	US-9602217-B2
Application number	US-201514689094-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Apr 17, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention is directed to a controller for generating ultra-wide band electrical signals for high data-rate single optical carrier transmission. The controller includes generating a digitally jointed baseband signal with radio frequency RF up-conversion to create optical dual side bands.

First claim

The invention claimed is:

1. A controller comprising:
a module for generating ultra-wide band electrical signals for high data-rate single optical carrier transmission with two sets of electrical baseband input signals;
an optical I/Q modulator coupled to two 2×2 I/Q up-converters to produce baseband electrical signals representing a positive side-band carrier and a negative side-band carrier; and
an IQ mixer applied to a single carrier which mixes baseband I and Q components with an RF local oscillator (LO) with frequency f Lo and fine phase adjustments to produce up-converted I′ and Q′ components each used to drive I and Q arms of an optical I/Q modulator as:
I′=I cos(2π f LO t )− Q sin(2π f LO t )

Q′=I sin(2π f LO t )+ Q cos(2π f LO t );

and

a processor with code for generating a digitally jointed baseband signal with radio frequency RF up-conversion to create optical dual side bands.

2. The controller of claim 1 , wherein the code for generating of the digitally jointed baseband signal comprises generating an optical side-band signal using RF I/Q up-conversion.

3. The controller of claim 1 , wherein the code for generating of the digitally jointed baseband signal comprises using a 2×2 RF I/Q up-converter to generate single I and Q signal components.

4. The controller of claim 1 , wherein the code for generating of the digitally jointed baseband signal comprises constructing a 2×2 RF I/Q up-converter using 4 RF mixers with local oscillator LO phase control.

5. The controller of claim 1 , wherein the code for generating of the digitally jointed baseband signal comprises generating a single optical carrier with a high data rate using dual side bands.

6. The controller of claim 5 , wherein the code for generating the single optical carrier comprises combining up-converted I and Q components of each of the side bands electrically for dual side band signal generation.

7. The controller of claim 6 , wherein the code for generating the single optical carrier comprises allocating one or more sets of electrical baseband signals in each of the side bands using parallel RF I/Q up-conversion.

8. The controller of claim 7 , wherein the code for generating the single optical carrier comprises using RF local oscillator LO frequencies to control spacing between each of the electrical carriers.

9. The controller of claim 1 , wherein the digitally jointed baseband signal comprises taking digitally generated electrical baseband signals as inputs to the RF up-conversion.

10. The controller of claim 1 , wherein the digitally jointed baseband signal comprises jointly generating sum/difference components of the two sidebands for simpler RF mixing.

11. The controller of claim 10 , wherein jointly generating sum/difference components comprises generating the sum/difference components in a digital domain for RF mixer and coupler reduction.

12. The controller of claim 1 , wherein the code for generating of the digitally jointed baseband signal comprises code for:
employing an optical single side-band generation using RF I/Q up-conversion to generate up-converted single side-band I and Q signal components;
generating a single optical carrier for a high data rate using dual side-bands;
combining the up-converted I and Q components of each side-band electrically with dual-bands of the optical carrier to generate electrical baseband signals; and
using the electrical baseband signals as inputs to RF up-converters of the RF I/Q up-conversion.

Assignees

• Nec Lab America Inc
• Nec Corp

Inventors

• Huang Yue-Kai
• Zhang Shaoliang
• Yaman Fatih

Classifications

• H04B10/5165 Primary

  Carrier suppressed; Single sideband; Double sideband or vestigial · CPC title

• H04B1/7163 Primary

  using impulse radio · CPC title