J.C. Centanni

All-optical regeneration in one- and two-pump parametric amplifiers using highly nonlinear optical fiber

We describe the operation of a two-pump parametric optical regenerator. It is shown that higher order parametric coupling provides optical regeneration with a high extinction ratio. Excessive spectral broadening is studied in a two-pump architecture and compared with that of the one-pump parametric regenerator. We show that the spectral widths of the higher order terms can be controlled in amplifiers by using counterphased optical pumps.

An 8-channel digitally tunable transmitter with electroabsorption modulated output by selective-area epitaxy

We demonstrate an 8-frequency digitally tunable laser based on a waveguide grating router with an electroabsorption modulated output. The laser wavelengths range from 1.567 to 1.580 /spl mu/m with channel spacings of 200 GHz (1.6 nm). The modulator extinction is -10 dB/VN with a -5-V bias. A unique output coupler design delivers an ASE noise suppression of -55 dB//spl Aring/.<<ETX>>

Continuous-wave parametric gain synthesis using nondegenerate pump four-wave mixing

The authors demonstrate continuous-wave parametric amplification using modulational interaction between two spectrally distant optical pumps and a single section of uniform fiber. The proposed configuration is used to synthesize flat parametric gain over more than 22-nm bandwidth.

Selective suppression of idler spectral broadening in two-pump parametric architectures

We describe methods for selective suppression of idler spectral broadening in two-pump fiber parametric fiber amplifiers. Combinations of multiple amplification bands and dissimilar pump modulation techniques are used to generate narrow idlers at preselected wavelengths. In-phase pump modulation is shown to eliminate the need for phase-delay management in two-pump parametric amplification schemes.

Wavelength selectable laser with inherent wavelength and single-mode stability

We present a 8/spl times/200 GHz wavelength selectable laser that has inherent wavelength and single-longitudinal-mode stability. The wavelength stabilization is accomplished by the long cavity and passive intracavity chirped waveguide grating router, and the single-mode stabilization is accomplished by gain nonlinearities, aided by minimization of cavity length and router passband width.

Wavelength division multiplexed transmission over standard single mode fiber using polarization insensitive signal conjugation in highly nonlinear optical fiber

We demonstrate 10 Gb/s, 5-channel, wavelength multiplexed transmission over four 80-km standard fiber spans using polarization invariant spectral inversion provided by a broadband fiber parametric amplifier using orthogonally-polarized pumps having synchronized phase modulation for stimulated Brillouin suppression.

Multiple-band bit-level switching in two-pump fiber parametric devices

We investigated the feasibility of multiple-band switching using a two-pump fiber parametric device. The switching architecture combines band amplification, wavelength conversion, and selective signal conjugation, enabled by temporal control of one or both parametric pumps. A switching scheme with a single pump control was constructed and evaluated. Multiple-band bit-level optical switching is demonstrated over bandwidth greater than 50 nm, with a maximal conversion efficiency of 24.2 dB.

A long-wavelength 10-V optical-to-electrical InGaAs photogenerator

We report a high-voltage integrated optical-to-electrical power converter, or photogenerator, operating in the long-wavelength (1480-1650 nm) regime for use in fiber-optic networks. These devices deliver power at voltages in excess of 10 V, which is sufficient to operate switches, micromechanical devices, electronic controllers, optoelectronic circuits and other electrical devices. The high-voltage photogenerator enables provisioning and protection at unpowered nodes in fiber-optic networks, using only the long wavelength light present in the optical fiber as the power source. We also demonstrated its use with a MEMS optical shutter to construct a novel optical power limiter.

Performance of fiber parametric-processing devices using binary-phase-shift-keyed pump modulation

Binary-phase-shift-keyed pump modulation in fiber parametric devices is investigated. The temporal and spectral properties of wavelength-converted optical signals are studied as functions of the pump-modulation rate. Excessive idler broadening is observed in both one- and two-pump parametric architectures. The idler impairments are found to increase as the rise and fall times of the pump-modulation scheme decrease.

Microwatt-power InGaAs photogenerator for lightwave networks

A 3/spl times/3 array of series-connected InGaAs photodetectors was used as a photogenerator to optically power a remotely-located microwatt-power optical shutter intended for use in a lightwave network. The conversion efficiency of the photogenerator was 7/spl times/10/sup -3/ A/W when the device was illuminated at 1550 nm from the output of a single-mode fiber; the open-circuit voltage was 2 V with 300 /spl mu/W of incident power.