André Guimarães | Universidade Estadual de Campinas (original) (raw)

Uploads

Papers by André Guimarães

Research paper thumbnail of Q penalties due to pump phase modulation and pump RIN in fiber optic parametric amplifiers with non-uniform dispersion

Optics Communications, 2005

We present an experimental and numerical investigation of the quality factor degradation (DQ) due... more We present an experimental and numerical investigation of the quality factor degradation (DQ) due to pump phase modulation and pump relative intensity noise (RIN) in single-and double-pumped fiber optical parametric amplifiers (FOPAs). These penalties are investigated in FOPAs constructed with fibers having constant and randomly varying zero dispersion wavelength (k 0) along the fiber. We show that pump phase modulation in uniform fibers (constant k 0) produces large Q penalties, while in fibers with variations of k 0 , these penalties can be strongly reduced in both, single and double-pumped FOPAs. We also show that Q penalties due to pump phase modulation tend to disappear in FOPAs made with very short fibers (L < 0.1 km) and very low dispersion slope (S 0 < 0.002 ps/nm 2-km). The Q penalties due to pump RIN, which for typical FOPA parameters are much smaller than those due to pump phase modulation, are also reduced in non-uniform fibers (varying k 0), but do not depend on fiber length neither on fiber dispersion slope.

Research paper thumbnail of Experimental study on crosstalk in double-pumped fiber optic parametric amplifier

OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005

Research paper thumbnail of High performance hybrid EDFA-FOPA pre-amplifier for 40 Gb/s transmission

(CLEO). Conference on Lasers and Electro-Optics, 2005., 2005

Research paper thumbnail of Influence of zero dispersion wavelength variations on cross-talk in single-pumped fiber optic parametric amplifiers

Optics Communications, 2004

We show that variations of the zero dispersion wavelength (k 0) in single-pumped fiber optic para... more We show that variations of the zero dispersion wavelength (k 0) in single-pumped fiber optic parametric amplifiers (FOPAs), greatly enhances four-wave mixing induced cross-talk in a two-channel wavelength division multiplexed system. We compare experimentally the performance of two FOPAs with identical gains but differing in their standard deviations of k 0 ($0.1 and $2 nm) and we obtain a power penalty of 3.8 dB larger in the FOPA with the larger fluctuations of k 0 .

Research paper thumbnail of Q penalties due to pump phase modulation in FOPAs

OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005

OWN4 in Fig. 3 that, as the pump approaches &amp;amp;amp;amp;amp;amp;amp;lt;X&amp;amp;amp... more OWN4 in Fig. 3 that, as the pump approaches &amp;amp;amp;amp;amp;amp;amp;lt;X&amp;amp;amp;amp;amp;amp;amp;amp;&amp;amp;amp;amp;amp;amp;amp;gt;, the noise at level 0 remains constant while that at level 1 increases. This last is in agreement with our numerical results of figure 1(b) and is due to the pump phase modulation. Figure 3. Eye diagrams as a function of the signal location: (a) h, X, - &amp;amp;amp;amp;amp;amp;amp;lt;*o&amp;amp;amp;amp;amp;amp;amp;gt; = 0.2 nm, and (d) i, - &amp;amp;amp;amp;amp;amp;amp;lt;l£&amp;amp;amp;amp;amp;amp;amp;gt; = 0.16 nm. • &amp;amp;amp;amp;amp;amp;amp;lt;X*&amp;amp;amp;amp;amp;amp;amp;gt; = 0.25 nm (back-to-back) , (b) kt ~ &amp;amp;amp;amp;amp;amp;amp;lt;^&amp;amp;amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;amp;amp;gt; = 0.25 nm, (c) In order to obtain AQ, we first measured the back-to-back Q, factor by connecting directly the transmitter and receiver, and then we measured the Qa factor ...

Research paper thumbnail of Signal amplification by four‐wave mixing in low‐dispersion optical fibers

Microwave and Optical Technology Letters, Dec 5, 1999

Energy conversion from two pump waves into a middle-frequency weak signal wave due to four-wave m... more Energy conversion from two pump waves into a middle-frequency weak signal wave due to four-wave mixing in low-dispersion fibers is analyzed numerically and experimentally. Energy conversion of 20% is possible under realistic conditions, limited by fiber attenuation, high-order dispersion, and pump depletion.© 1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 318–321, 1999.

Research paper thumbnail of Parametric amplifier for mid‐span phase conjugation with simultaneous compensation of fiber loss and chromatic dispersion at 10 Gb/s

Microwave and Optical Technology Letters, Sep 20, 2004

We demonstrate simultaneous compensation of loss and chromatic dispersion for 10-Gb/s transmissio... more We demonstrate simultaneous compensation of loss and chromatic dispersion for 10-Gb/s transmission over 90-km of standard fiber using mid-span phase conjugation with a fiber-optic parametric amplifier that provides 9.4-dB gain over a bandwidth of 17 nm. The observed power penalty is less than 1.5 dB (at BER< 10− 9) relative to back-to-back measurements.© 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 503–505, 2004; Published online in Wiley InterScience (www. interscience. wiley. com). DOI ...

Research paper thumbnail of Q penalties due to pump phase modulation and pump RIN in fiber optic parametric amplifiers with non-uniform dispersion

Optics Communications, 2005

We present an experimental and numerical investigation of the quality factor degradation (DQ) due... more We present an experimental and numerical investigation of the quality factor degradation (DQ) due to pump phase modulation and pump relative intensity noise (RIN) in single-and double-pumped fiber optical parametric amplifiers (FOPAs). These penalties are investigated in FOPAs constructed with fibers having constant and randomly varying zero dispersion wavelength (k 0) along the fiber. We show that pump phase modulation in uniform fibers (constant k 0) produces large Q penalties, while in fibers with variations of k 0 , these penalties can be strongly reduced in both, single and double-pumped FOPAs. We also show that Q penalties due to pump phase modulation tend to disappear in FOPAs made with very short fibers (L < 0.1 km) and very low dispersion slope (S 0 < 0.002 ps/nm 2-km). The Q penalties due to pump RIN, which for typical FOPA parameters are much smaller than those due to pump phase modulation, are also reduced in non-uniform fibers (varying k 0), but do not depend on fiber length neither on fiber dispersion slope.

Research paper thumbnail of Experimental study on crosstalk in double-pumped fiber optic parametric amplifier

OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005

Research paper thumbnail of High performance hybrid EDFA-FOPA pre-amplifier for 40 Gb/s transmission

(CLEO). Conference on Lasers and Electro-Optics, 2005., 2005

Research paper thumbnail of Influence of zero dispersion wavelength variations on cross-talk in single-pumped fiber optic parametric amplifiers

Optics Communications, 2004

We show that variations of the zero dispersion wavelength (k 0) in single-pumped fiber optic para... more We show that variations of the zero dispersion wavelength (k 0) in single-pumped fiber optic parametric amplifiers (FOPAs), greatly enhances four-wave mixing induced cross-talk in a two-channel wavelength division multiplexed system. We compare experimentally the performance of two FOPAs with identical gains but differing in their standard deviations of k 0 ($0.1 and $2 nm) and we obtain a power penalty of 3.8 dB larger in the FOPA with the larger fluctuations of k 0 .

Research paper thumbnail of Q penalties due to pump phase modulation in FOPAs

OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005

OWN4 in Fig. 3 that, as the pump approaches &amp;amp;amp;amp;amp;amp;amp;lt;X&amp;amp;amp... more OWN4 in Fig. 3 that, as the pump approaches &amp;amp;amp;amp;amp;amp;amp;lt;X&amp;amp;amp;amp;amp;amp;amp;amp;&amp;amp;amp;amp;amp;amp;amp;gt;, the noise at level 0 remains constant while that at level 1 increases. This last is in agreement with our numerical results of figure 1(b) and is due to the pump phase modulation. Figure 3. Eye diagrams as a function of the signal location: (a) h, X, - &amp;amp;amp;amp;amp;amp;amp;lt;*o&amp;amp;amp;amp;amp;amp;amp;gt; = 0.2 nm, and (d) i, - &amp;amp;amp;amp;amp;amp;amp;lt;l£&amp;amp;amp;amp;amp;amp;amp;gt; = 0.16 nm. • &amp;amp;amp;amp;amp;amp;amp;lt;X*&amp;amp;amp;amp;amp;amp;amp;gt; = 0.25 nm (back-to-back) , (b) kt ~ &amp;amp;amp;amp;amp;amp;amp;lt;^&amp;amp;amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;amp;amp;gt; = 0.25 nm, (c) In order to obtain AQ, we first measured the back-to-back Q, factor by connecting directly the transmitter and receiver, and then we measured the Qa factor ...

Research paper thumbnail of Signal amplification by four‐wave mixing in low‐dispersion optical fibers

Microwave and Optical Technology Letters, Dec 5, 1999

Energy conversion from two pump waves into a middle-frequency weak signal wave due to four-wave m... more Energy conversion from two pump waves into a middle-frequency weak signal wave due to four-wave mixing in low-dispersion fibers is analyzed numerically and experimentally. Energy conversion of 20% is possible under realistic conditions, limited by fiber attenuation, high-order dispersion, and pump depletion.© 1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 318–321, 1999.

Research paper thumbnail of Parametric amplifier for mid‐span phase conjugation with simultaneous compensation of fiber loss and chromatic dispersion at 10 Gb/s

Microwave and Optical Technology Letters, Sep 20, 2004

We demonstrate simultaneous compensation of loss and chromatic dispersion for 10-Gb/s transmissio... more We demonstrate simultaneous compensation of loss and chromatic dispersion for 10-Gb/s transmission over 90-km of standard fiber using mid-span phase conjugation with a fiber-optic parametric amplifier that provides 9.4-dB gain over a bandwidth of 17 nm. The observed power penalty is less than 1.5 dB (at BER< 10− 9) relative to back-to-back measurements.© 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 503–505, 2004; Published online in Wiley InterScience (www. interscience. wiley. com). DOI ...