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Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Apiratikul P.,College Park | Cannon B.M.,College Park | And 12 more authors.
IEEE Photonics Technology Letters | Year: 2011

The conversion of data modulation format from 10-Gb/s return-to-zero on-off keying (RZ-OOK) to 10-Gb/s RZ binary phase-shift keying (RZ-BPSK) has been successfully carried out for the first time utilizing cross-phase modulation (XPM) in a passive AlGaAs waveguide. A 10-9-bit-error-rate (BER) preamplified receiver sensitivity gain of 1 dB was measured for the converted RZ-BPSK relative to baseline RZ-OOK, whereas a penalty of 2.7 dB relative to baseline RZ-BPSK is explained to be due to cross-absorption modulation induced by nondegenerate two-photon absorption (ND-TPA), as well as to an insufficient nonlinear phase shift. © 2011 IEEE.


Driscoll J.B.,Columbia University | Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Liu X.,Columbia University | And 7 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2010

Wavelength conversion of a 10 Gb/s 2.7%-duty-cycle return-to-zero (RZ) OOK (RZ-OOK) signal using XPM in a compact silicon nanowire waveguide (Si nanowire) and a detuned filter is successfully demonstrated for the first time. A 10 -9-BER receiver sensitivity penalty of <1dB was measured for the converted signal relative to the baseline signal, with a filter-probe detuning of 0.6nm. The system is numerically modeled and the results are shown to match well with the experimental results. The numerical model is further used to design an optimal filter that would eliminate filter-probe detuning. © 2010 IEEE.


Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Apiratikul P.,University of Maryland University College | Murphy T.E.,University of Maryland University College | And 3 more authors.
IEEE Photonics Technology Letters | Year: 2010

Wavelength conversion of a 10-Gb/s return-to-zero onoff-keyed (RZ-OOK) signal has been achieved using transient cross-phase modulation in a passive GaAs-AlGaAs bulk-waveguide, followed by a detuned filter. The converted RZ-OOK signal showed a power penalty of <1 dB at a bit-error-rate of 10-9 relative to the baseline RZ-OOK signal. © 2006 IEEE.


Apiratikul P.,University of Maryland University College | Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Carter G.M.,LPS | And 2 more authors.
IEEE Photonics Technology Letters | Year: 2010

We demonstrate the simultaneous conversion of wavelength and nonreturn-to-zero to return-to-zero (RZ) format at 10 Gb/s, using four-wave mixing in a passive GaAs bulk-waveguide. A conversion efficiency of -28 dB (idler output relative to signal output) and a conversion bandwidth of 48 nm could be achieved in this waveguide, which was fabricated in a single photolithographic step. The conversion efficiency is also characterized and compared with simulated results. The converted RZ onoff keying (RZ-OOK) signal demonstrated a 10-9 bit-error-rate receiver sensitivity penalty of 1 dB relative to baseline RZ-OOK. © 2010 IEEE.


Kuis R.,Center for Advanced Studies in Photonic Research | Kuis R.,University of Maryland Baltimore County | Johnson A.,Center for Advanced Studies in Photonic Research | Johnson A.,University of Maryland Baltimore County | Trivedi S.,Brimrose Corporation of America
Optics InfoBase Conference Papers | Year: 2010

The induced grating autocorrelation technique was used to measure g in short lengths of solid-core photonic crystal fibers (SC-PCFs): a 35-cm highly nonlinear PCF and two large mode area PCFs of lengths 4.5-m and 4.9-m. © 2010 Optical Society of America.


Astar W.,University of Maryland College Park | Astar W.,Center for Advanced Studies in Photonic Research | Driscoll J.B.,Columbia University | Liu X.,Columbia University | And 7 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2010

All-optical format conversion of 10 Gb/s non-return-to-zero on-off keying (NRZ-OOK) to RZ-OOK has been successfully achieved, for the first time to our knowledge, utilizing either cross-phase modulation (XPM) or four-wave mixing (FWM), in a Silicon (Si) nanowire. A 10-9-bit-error-rate (BER) receiver sensitivity gain of ∼2.8 dB was obtained for converted RZ-OOK relative to NRZ-OOK using XPM, whereas a receiver sensitivity gain of ∼2.5 dB was found for the FWM anti-Stokes RZ-OOK. Simultaneous wavelength and pulse format conversions were possible with FWM. No evidence of an error floor for BER 10-10 was observed in either technique. The converted RZ-OOK signal was also correctly encoded and of the correct polarity. © 2006 IEEE.


Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Driscoll J.B.,Columbia University | Liu X.,Columbia University | And 5 more authors.
Journal of Lightwave Technology | Year: 2010

Tunable wavelength conversion of a 10-Gb/s, return-to-zero ON-OFF-keyed (RZ-OOK) signal has been carried out in a silicon (Si) nanowire waveguide (Si nanowire) using a pump-probe configuration and cross-phase modulation (XPM), followed by a tunable filter. This filter spectrally emulated the pass-band of a commercial 50-GHz DWDM arrayed waveguide grating (AWG). The tunability of the wavelength conversion process was demonstrated over a range of 20 nm, limited only by the amplifiers and the filter, while keeping the 10-9-BER receiver sensitivity penalty of the converted signal to a 0.5-dB maximum. A comprehensive model of wavelength conversion by XPM (XPM-WC) was developed, which took into account two-photon absorption, the Kerr effect, and free-carrier generation. The results of the model demonstrate good agreement with the experiment, especially with respect to the observed spectral broadening. The numerical model was also used to assess the dominant contribution among the various mechanisms within the context of XPM-WC, and to investigate the potential of multicasting by XPM in the nanowire. © 2006 IEEE.


Astar W.,College Park | Astar W.,Center for Advanced Studies in Photonic Research | Cannon B.M.,College Park | Cannon B.M.,Center for Advanced Studies in Photonic Research | And 10 more authors.
Journal of Lightwave Technology | Year: 2013

The dependence of the nonlinear coefficients on the transverse profiles of the pump and the probe fields, which is especially important for a highly anisotropic device such as the Al0.18Ga0.82As waveguide, was not explicitly stated in our paper "Data transfer from RZ-OOK to RZ-BPSK by polarization-insensitive XPM in a passive birefringent nonlinear AlGaAs waveguide." The four-wave mixing efficiency was also incorrectly presented to depend on the square of the device physical length. Lastly, the influence of the fiber-waveguide coupling coefficient was neglected with insufficient justification, leading to an inaccurate general expression for the detected voltage. © 1983-2013 IEEE.


Kuis R.,Center for Advanced Studies in Photonic Research | Kuis R.,University of Maryland Baltimore County | Johnson A.,Center for Advanced Studies in Photonic Research | Johnson A.,University of Maryland Baltimore County | Trivedi S.,Brlmrose Corporation
Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010 | Year: 2010

The inducea grating autocorrelation technique was used to measure y in short lengths of solid-core photonic crystal fibers (SC-PCFs): a 35-cm highly nonlinear PCF and two large mode area PCFs of lengths 4.5-m and 4.9-m. © 2010 Optical Society of America.

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