J.M. Chavez Boggio

730-nm optical parametric conversion from near- to short-wave infrared band

A record 730 nm parametric conversion in silica fiber from the near-infrared to the short-wave infrared band is reported and analyzed. A parametric gain in excess of 30 dB was measured for a signal at 1300 nm (with corresponding idler at 2030 nm). This conversion was performed in a travelling single-pass one-pump parametric architecture and high efficiency is achieved by a combination of high peak power and a nonlinear fiber with a reduced fourth-order dispersion coefficient.

Bandwidth-efficient phase modulation techniques for Stimulated Brillouin Scattering suppression in fiber optic parametric amplifiers

Two novel bandwidth efficient pump-dithering Stimulated Brillouin Scattering (SBS) suppression techniques are introduced. The techniques employ a frequency-hopped chirp and an RF noise source to impart phase modulation on the pumps of a two pump Fiber Optical Parametric Amplifier (FOPA). The effectiveness of the introduced techniques is confirmed by measurements of the SBS threshold increase and the associated improvements relative to the current state of the art. Additionally, the effect on the idler signal integrity is presented as measured following amplification from a two pump FOPA employing both techniques. The measured 0.8 dB penalty with pumps dithered by an RF noise source, after accruing 160 ps/nm of dispersion with 38 dB conversion gain in a two-pump FOPA is the lowest reported to date.

Synthesis of Equalized Broadband Parametric Gain by Localized Dispersion Mapping

A record continuous-wave one-pump fiber-optic parametric amplifier was constructed using localized dispersion measurement of highly nonlinear fiber. Record 3-dB equalized gain bandwidth of 120 nm was measured for the first time. The second amplifier constructed using suboptimal segments of the identical fiber spool did not replicate the wideband performance, confirming the importance of accurate dispersion fluctuating fiber map.

105-ns Continuously Tunable Delay of 10-Gb/s Optical Signal

A continuously tunable optical delay line providing over 105 ns of 10-Gb/s optical channel is reported using a two-pump parametric process in a nonlinear optical fiber. Performance limits are measured and compared with recently reported all-optical delay results. The figure of merit defined by the delay-bandwidth product is 1055.

Short wavelength infrared frequency conversion in ultra-compact fiber device

Linear and nonlinear characteristics of devices using millimeter-scale spools of highly nonlinear fiber are experimentally investigated within 2000-2400nm spectral range. Coils with radius larger than 3.5 mm indicate that macro-bending induced radiation loss is negligible up to 2400nm. Devices with smaller diameter coiling resulted in macro-bending losses that dominate over micro-bending losses beyond 2200nm. A tunable short-wave infrared source was constructed using a coin-sized fiber module to demonstrate an efficient nonlinear conversion from 1.26 to 2.2 microm.

Crosstalk mitigation in fiber optic parametric amplifier

We analyze crosstalk in two-pump fiber optical parametric amplifiers (2P-FOPAs) with 13 WDM signal channels in two situations. In the first case, we simulate an in-line amplifier with moderate output powers (/spl sim/ 0 dBm). We show that for a fixed gain, crosstalk can be reduced using a shorter fiber and larger pump power. In the second case, we simulate a preamplifier with low output power (/spl sim/ -15 dBm). Our results indicate that 2P-FOPA are good devices as preamplifiers but rather limited for in-line amplification.

Optical frequency comb generated by four-wave mixing in highly nonlinear fibers

Efficient generation of a cascade of four-wave mixing products using a low-dispersion highly nonlinear fiber is demonstrated. The measured optical frequency comb (with a spacing of 100 GHz) spans over more than 350 nm.

Polychromatic sampling for high-speed real-time processing

Recent advances in polychromatic sampling are reviewed in context of the multicast parametric synchronous sampling architecture of waveforms and real-time processing of high bitrate signals. Operation principle and latest results of polychromatic sampling are presented.

Tunable all-fiber short-wavelength-IR transmitter

Tunable SWIR operation in 2150nm band is reported for the first time. All-fiber transmitter construction used parametric conversion to convert 1.26µm seed to 2.155µm SWIR channel with record 35dB efficiency over 900nm spectral range.

Raman-induced gain distortions in double-pumped parametric amplifiers

Raman-induced gain distortions in broadband (pump separations of 132 and 155 nm) double-pumped parametric amplifiers are theoretically and experimentally analyzed. A gain profile possessing 100 nm of 3 dB ripple and 140 nm of 4.7 dB ripple is demonstrated.