As the bit rates of routed data streams exceed the throughput of single wavelength-division multiplexing channels, spectral and spatial traffic aggregation become essential for optical network scaling. These aggregation techniques reduce network routing complexity by increasing spectral efficiency to decrease the number of fibers, and by increasing switching granularity to decrease the number of switching components. Spectral aggregation yields a modest decrease in the number of fibers but a substantial decrease in the number of switching components. Spatial aggregation yields a substantial decrease in both the number of fibers and the number of switching components. To quantify routing complexity reduction, we analyze the number of multi-cast and wavelength-selective switches required in a colorless, directionless and contentionless reconfigurable optical add-drop multiplexer architecture. Traffic aggregation has two potential drawbacks: reduced routing power and increased switching component size.
In this paper, we discuss the potential for advanced modulation and electronic signal processing techniques to remove key barriers to commercially viable, near-term deployment of multi-Tb/s link capacities utilizing 40 Gb/s optical transport.
KEYWORDS: Homodyne detection, Signal to noise ratio, Optical networks, Interference (communication), Receivers, Information operations, Modulation, Lead, Telecommunications, Signal attenuation
Homodyne crosstalk causes severe system performance degradation in optical networks by beating with the desire signal. While Gaussian approximation overestimates the performance degradation, for a single dominant crosstalk source, the exact noise probability distribution and closed- form error probability is derived in this paper.
A multiwavelength source is generated by four-wave-mixing in nonlinear dispersion-shifted-fiber with an accurate frequency separation of 100 GHz defined precisely by two seeding wavelengths. The multiwavelength source can find wide applications in dense WDM systems or spectrum-sliced WDM access networks.
We discuss the design of optical concentrators based on dielectric and hollow compound parabolic concentrators (CPCs), for use in free-space infrared communication receivers. In order to acheive a high signal-to-noise ratio in a direct-detection receiver, it is desirable to use an optical bandpass filter that passes the signal but attenuates ambient radiation. Placement of a planar bandpass filter at the entrance aperture of a CPC results in a receiver having a narrow passband and high gain, but a narrow acceptance angle. The addition of a second, angle-transforming CPC at the entrance aperture allows the receiver to achieve simultaneously a narrow passband and an acceptance angle approaching 90 deg. We have employed a Monte Carlo ray tracing method to calculate the optical gains of several optical concentrator designs. We find that the optical gains of single and double CPCs are, respectively, about 94% and 93% those of ideal optical concentrators, while addition of planar bandpass filters decreases these gains to about 88% and 86%, respectively. We compare the performance and size of CPC-based concentrators with those based on dielectric hemispheres fitted with hemispherical bandpass filters.
Conference Committee Involvement (3)
Optical Transmission, Switching, and Subsystems VI
27 October 2008 | Hangzhou, China
Optical Transmission, Switching, and Subsystems IV
5 September 2006 | Gwangju, South Korea
Optical Transmission, Switching, and Subsystems III
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