A novel method to double the measurement range of wavelength scanning interferometery (WSI) is described. In WSI the measured optical path difference (OPD) is affected by a sign ambiguity, that is, from an interference signal it is not possible to distinguish whether the OPD is positive or negative. The sign ambiguity can be resolved by measuring an interference signal in quadrature. A method t...

Motivated by wavelength division multiplexing in all-optical networks, we consider the problem of finding a set of paths from a fixed source to a multiset of destinations, which can be coloured by the fewest number of colours so that paths of the same colour do not share an arc. We prove that this minimum number of colours is equal to the maximum number of paths that share one arc, minimized ov...

This paper reviews recent results on wavelength conversion in Silicon. The conversion in the 1300 to 1550 range is achieved through parametric Raman coupling between the pump, Stokes and anti-Stokes waves. High signal-to-noise ratio is measured despite a limited conversion efficiency. Achieving high conversion efficiency requires phase matching in the waveguides as well as means to reduce waveg...

An optical fiber can potentially have more than 30 THz of bandwidth that can be exploited by future generation broadband ISDN networks. However, because of the mismatch between optical transmission and electronic processing, the network transmission rate cannot exceed few Gbps. One popular solution to this problem is to employ wavelength division multiplexing (WDM) by fragmenting the whole band...

Millimeter-wavelength spectra were obtained of CO, HCN, H2CO, and CH3OH in Comet C/1996 B2 (Hyakutake) with the NRAO 12-m telescope on 21 Mar 1996 UT. The emission of CO, H2CO and HCN was mapped in the coma when the comet was 0.2 AU from the Earth, providing a detailed look at the behavior of these species in the inner coma. The mapping data indicate the presence of multiple velocity components...

We demonstrate 10Gbit/s operation of two different types of monolithic photocurrent driven wavelength converters (PD-WC). These photonic integrated circuits use a Semiconductor Optical Amplifier (SOA)-PIN photodetector receiver to drive an Electro-absorption (EA), or Mach-Zehnder (MZ) modulator that is integrated with a SGDBR tunable laser. We demonstrate improvements in optical bandwidth, inse...

This paper studies the routing and wavelength assignment problem for a circuit-switched time division multiplexed (TDM) wavelength-routed (WR) optical WDM network. In a conventional wavelength routed network, an entire wavelength is assigned to a given session (or circuit). This can lead to lower channel utilization when the individual sessions do not need the entire channel bandwidth. This pap...

|We consider optical networks using wavelength division multiplexing, where the path a signal takes is determined by the network switches, the wavelength of the signal, and the location the signal originated. Therefore, a signal is routed through a combination of circuit switching and wavelength routing (assigning it a wavelength). We present a bound on the minimum number of wavelengths needed ...