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We demonstrate error-free dense-wavelength-division multiplexing (DWDM) transmission of 40 40-Gb/s channels with 100-GHz spacing over 10 000 km dispersion-managed fiber using carrier-suppressed return-to-zero differential-phase-shift keying (CSRZ-DPSK), enhanced foward-error correction, and all-Raman-amplified spans with 100-km terrestrial length.
Larger optical penalties than predicted by a Gaussian crosstalk model are found both in our experiments and in the literature when investigating signals including multiple interferometric crosstalk contributions. We attribute this to an imperfect signal extinction ratio. In this letter, simple analytical relations for crosstalk induced power penalties are(More)
The optimized optical receiver for a 40-Gb/s optical duobinary signal is investigated by simulation. It is found, that by optimizing the optical filter and the electrical filter in the receiver, the sensitivity of the optical duobinary can be improved greatly; meanwhile, the high dispersion tolerance nature of the optical duobinary signal will not be(More)
Two types of modular 2/spl times/2 wavelength-switching blocks are proposed in this letter. A 2/spl times/2 fixed wavelength-switching block can cross-connect two fixed channels between two fibers, and a 2/spl times/2 tunable wavelength-switching block can cross-connect any two channels between two fibers. These modular blocks can be used to build scalable(More)
A very low crosstalk N/spl times/N wavelength router construction based on 1/spl times/N AWG multi/demultiplexers has been proposed. The peak crosstalk level of -53 dB is measured in such an 8/spl times/8 wavelength router and the power penalty from the router is negligible. Rather large wavelength routing networks can be built using the wavelength router(More)
A multiwavelength RZ optical source with equal amplitudes and pulsewidths is successfully obtained by using wavelength conversion in a nonlinear optical loop mirror consisting of a common dispersion shifted fiber. The converted wavelengths of the eight signal pulses are in agreement with the ITU-T proposal and a commercial arrayed-waveguide grating is used(More)
We have proposed a novel dynamic WXC based on MZI-OADM. The advantages of this dynamic WXC are very low differential insertion loss, using less exchanging units than reported structures, and the ability to be integrated. In experiment, the three channels from the path with maximum OADMs in a 2/spl times/2 dynamic WXC capable of exchanging five wavelengths(More)
Calculations based on the exact probability density function of the received power show that for a fixed total crosstalk power, the incoherent crosstalk penalty increases with the number of crosstalk signals. Performed experiments verify this.
The cascading characteristics of a wavelength converter based on cross-gain modulation (XGM) are studied experimentally using a recirculating loop at 10 Gb/s. The maximum cascaded number of the wavelength converter converting the signal to the same wavelength is improved from five to eight by adding a fiber grating-based optical add-drop multiplexer after(More)
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