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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.


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.


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.,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 | 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.

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