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An ultrafast bit rate and format transparent all-optical packet equalizer is presented, based on fiber-optic parametric amplification. Its equalizing performance is investigated for 43 Gbaud OOK, DPSK and DQPSK signals. The improvement is verified in transmission experiments over 1000km dispersion-managed fiber.
We have developed a widely tunable laser source that uses triple ring resonators with narrow spectral linewidth. A spectral linewidth of less than 100 kHz is obtained for all wavelength channels across C-band. This laser achieved a high fiber output power of ~16 dBm and a high side-mode-suppression ratio of > 45 dB.
A polarization-independent optical limiter is proposed using two-stage polarization-diversity configured optical parametric amplifiers in gain-saturated condition. Its amplitude level equalizing effect is successfully demonstrated for a 40 Gb/s signal with less than 0.2 dB polarization dependence.
An all-optical parametric fiber switch for all-optical amplitude noise suppression was applied mid-span in a 107 Gb/s differential phase shift keying (DPSK) transmission experiment. Using this switch an improved performance after 320 km transmission was achieved.
We have developed monolithically integrated dual evanescently coupled waveguide photodiodes (EC-WG- PDs) for ultra-high bit rate DPSK/DQPSK systems. The characteristics of each PD are equivalent with 3 dB bandwidth of over 40 GHz and external quantum efficiency of 0.85 A/W.
A novel transparent demultiplexer for ultra fast pulse trains using a 19 m long HNLF-based parametric amplifier is proposed. Using this multiplexer, 320-10 Gb/s OTDM DEMUX with parametric gains over 20 dB were successfully implemented
A single-polarization, 160 Gb/s RZ-DPSK-signal is transmitted over 240 km fiber, processed in a network node converting RZ-DPSK into OOK, 160 Gb/s into 40 Gb/s and the wavelength from 1551 nm to 1559 nm. The 40 Gb/s OOK-signal is transmitted error-free over additional 160 km SSMF.
A semiconductor based all-optical sampling system is demonstrated for the first time to measure a 320 Gb/s optical eye diagram. The system incorporates a gain-transparent ultrafast-nonlinear interferometer as sampling gate
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