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Compression of higher order optical solitons in fibers with anomalous dispersion decreasing along their length is investigated. We demonstrate high-quality compression of pulses with initial soliton order 1Show More
We demonstrate dispersion compensation of a WDM 3×40 Gb/s (100 GHz spaced) RZ-DPSK signal in a 162 km standard fibre link by using optical phase conjugation via CW pumped four wave mixing in a As2S3 planar waveguide.Show More
We investigate the waveform power spectrum (WPS) measurement of ultrashort pulses using the nonlinear Kerr effect in an optical waveguide. Our study focuses on a recent experiment reporting the WPS measurement of 260-fs pulses using a 6-cm-long, highly nonlinear chalcogenide (ChG) planar waveguide. By numerical simulation of the underpinning nonlinear propagation, we show the importance of low chr...Show More
All-optical pre-compensation of nonlinear distortion of polarization-multiplexed 80 Gb/s RZDPSK signals by pre-distortion and fibre loop phase-conjugation is evaluated experimentally. The impact of inter-polarization nonlinearity on the bit-error rate improvement for a 728 km dispersion-managed link employing a direct detection receiver is shown.Show More
We demonstrate the generation of ultrastable millimeter-wave carriers from a passively mode-locked monolithic InGaAs MQW DBR laser injection locked by a double sideband suppressed carrier modulated optical signal. We investigate the effect of the optical power and the wavelength of the injection signal on the phase noise of the generated millimeter-wave carrier. Once locked, the laser can track th...Show More
We demonstrate compensation of optical fiber nonlinearity by a novel end-span scheme. Operation on a 40 Gbit/sec RZ-DPSK signal before transmission in 191 km fiber pre-compensates self phase modulation to improve the BER power penalty by >;3.5 dB.Show More
Optical switching a 160-Gb/s signal using a LiNbO Mach-Zehnder modulator (MZM) is enabled by a novel method of connecting it within an optical fiber-loop mirror. The principle of operation exploits the unidirectional optical modulation of the MZM such that counterpropagating waves within the loop experience unequal amplitude modulation leading to output transmission of a high-quality 40-GHz pulse ...Show More
7.5-ps optical pulses generated from a gain-switched semiconductor laser at 2 GHz are successfully compressed down to 20 fs using a four-stage fiber soliton pulse compressor consisting of standard single-mode transmission, Er-doped, dispersion-decreasing, and dispersion-flattened fibers, respectively. We have experimentally confirmed that the soliton self-frequency shift plays an important role in...Show More
Record distance transmission of 250-fs pulses over 139-km optical fiber at 6-GHz repetition is realized by compensating chromatic dispersion up to fourth-order using a novel approach. The link is designed combining 108.5-km standard single-mode fiber (SMF), 17.5-km dispersion-shifted fiber, and 13-km negative-slope dispersion-compensating fiber to achieve both zero total chromatic dispersion and s...Show More
Optical pulse distortion due to third-order dispersion (TOD) in linear fiber transmission of 250-fs pulses at 5 GHz over 600 m is reduced by applying electrooptic phase modulation (EOPM) from a LiNbO/sub 3/ device. Initial propagation in dispersion-compensating fiber cancels the second-order dispersion of the fiber-link and also linearly chirps the pulses to a stretched width of 47 ps, which enabl...Show More
Compensation of higher-order fiber dispersion in addition to the group-velocity (second-order) dispersion (SOD) is important for 1.55 /spl mu/m optical time-division-multiplexed (OTDM) communication systems utilizing subpicosecond pulses to accommodate data-rates approaching Tbit/s. Third-order dispersion of 250 fs pulses propagating at /spl sim/5 GHz over fiber-link lengths of 600 m and 2.33 km w...Show More
We demonstrate parallel compensation of optical fiber nonlinearity for transmission of 100 GHz spaced 3×40 Gb/s RZ-DPSK signals by all-optical nonlinear pre-distortion and phase-conjugation embedded in the transmitter. The Q-factor is improved by 1.4-2.6 dB for all channels.Show More
We present on-chip, all-optical pulse erasure for enabling ultrahigh-bandwidth signal processing. 15 dB pump depletion is achieved for picoseconds pulses using the instantaneous χ(3) nonlinearity in a dispersion-engineered chalcogenide waveguide.Show More
We report the first demonstration of a photonic-chip based all-optical XOR gate for 40Gbit/s and 160Gbit/s phase-encoded signals. We achieve error-free, XOR operation for 40Gbit/s signals without power penalty in a dispersion-engineered chalcogenide waveguide.Show More
Compensation of the Kerr nonlinearity in dispersion-managed optical fiber links is demonstrated for 100-GHz-spaced wavelength division multiplexing (WDM) 40-Gb/s return-to-zero-differential phase-shift keying signals using all-optical nonlinear predistortion and phase-conjugation at the transmitter. Measurements of the bit-error rate (BER) reveal a Q2-factor improvement from 1.3 to 2.9 dB for tran...Show More
Multichannel wavelength conversion is experimentally demonstrated for high-speed 128 Gb/s dual-polarization quadrature phase-shift keying signals using four-wave mixing in a polarization diversity circuit with silicon nanowires as nonlinear elements. The wavelength conversion performance is investigated for both single- and three-channel input signals, showing quality factors well >9.8 dB (corresp...Show More
A low loss As2S3 planar waveguide with ultra-high optical Kerr nonlinearity ~2000 W-1 ldr km-1 and only 50-mm length demonstrates high-performance time-division demultiplexing of a 160-Gb/s signal into its tributary 10-Gb/s channels via four-wave mixing (FWM) with copropagating pump pulses. Although the waveguide has a high normal dispersion parameter, its combined high nonlinearity in such short ...Show More
The compression of higher order soliton pulses in dispersion decreasing fibers (DDF's) generates ultrashort fundamental soliton-like pulses accompanied by a broad low-intensity pedestal component. In this paper, we investigate the subsequent removal of the pedestal using a nonlinear optical fiber loop mirror (NOLM) to produce high-quality pulses. The influence of higher order effects such as stimu...Show More
We demonstrate for the first time the feasibility of 600-fs pulse transmission over 144 km using midway optical phase conjugation via a cascaded second-order process in a periodically poled LiNbO/sub 3/ waveguide. The output pulses are negligibly distorted and broadened to 680 fs. This result could not be obtained without complete compensation for fourth-order dispersion performed by midway optica...Show More
Bit-error rate performance of newly developed AS2S3 planar waveguides in applications of highspeed all-optical time-division demultiplexing and wavelength conversion of 40-160 Gb/s optical signals through the use of four-wave mixing and cross-phase modulation is investigated.Show More
We demonstrate broadband wavelength conversion of amplitude and phase-shift keyed signals at 40–160 Gb/s using the optical Kerr-effect in a photonic chip for the first time. This is enabled by a dispersion-shifted, highly nonlinear As2S3 waveguide.Show More
A novel technique for suppressing 3/sup rd/ order fibre dispersion with an electro-optic phase modulator is presented. The pulse shape after fibre transmission is significantly improved by performing sinusoidal phase modulation of the temporally stretched optical pulse.Show More