Abstract: The invention provides an apparatus for and method of monitoring wavelength multiplexed signal light, which can obtain monitored data for multi-channel optical signals contained in the wavelength multiplexed signal light, which can avoid a large size and complicated structure and high cost of monitoring apparatus, and which can easily monitor the wavelength multiplexed signal light. The invention also provides an optical transmission system employing the monitoring apparatus and method. An optical filter being able to control a loss pattern is disposed on a monitoring waveguide for the wavelength multiplexed signal light, which is branched for monitoring from an input waveguide and an output waveguide constituting a main optical transmission path in a wavelength multiplexed signal light monitoring apparatus.

Abstract: In an optical coupling system, an optical coupler having a dielectric mirror or Gaussian beam mirror is used to efficiently couple optical signals to photonic crystal waveguides. Dielectric mirrors offer the advantage of optical coupling between dielectric waveguides and single mode photonic crystal waveguides. Various types of optical couplers may be implemented with or without a dielectric waveguide in the system.

Abstract: An integrated silicon mesa structure integrated in a glass-on-silicon waveguide, and a method of manufacturing it. The silicon mesa waveguide is integrated in a glass-on-silicon waveguide composed of a wave-guiding core between lower and upper sheath layers having a refractive index lower than the index of the wave-guiding core. The silicon mesa structure is preferably made of the silicon substrate, and a low loss silicon mesa waveguide is formed by removing excess material below the mesa structure. Further, transitions between the glass-on-silicon waveguide the the silicon mesa waveguide section are preferably formed such that transmission of light passing the transitions is adiabatic.

Abstract: A method of optimising the componentry of an optical data transmission link, the link comprising a series of optical components interconnected by a fiber network, the method comprising the steps of: (a) calculating an equivalent fiber representation for the link; (b) utilising an optimisation algorithm to eliminate redundant optical components from the link; (c) utilising an optimisation algorithm to determine the input channel power of the link.

Abstract: A cascaded interleaver includes at least three two-stage Fourier filters. A first of the Fourier filters includes first and second waveguides such that the first waveguide has a longer optical path length than the second waveguide. A second of the Fourier filters includes third and fourth waveguides such that the third waveguide has a longer optical path length than the fourth waveguide. A third of the Fourier filters has fifth and sixth waveguides such that the fifth waveguide has a longer optical path length than the sixth waveguide. The third waveguide has an input coupled to an output of the first waveguide and the fifth waveguide has an input coupled to an output of the second waveguide. At least one of the Fourier filters include at least three couplers alternating with a delay path between adjacent ones of the couplers. A second of the couplers is of an order different from a first and third of the couplers.

Abstract: Two ribbon-shaped optical fibers are bare at their leading ends, and bare fibers are adhered and fixed by a V-shaped substrate and a holding plate. The jackets of the ribbon shaped optical fibers are adhered and fixed in the V-shaped substrate by a jacket housing plate. Moreover, dummy fibers on the outermost sides of the bare fibers contact at their portions with the end edges of the V-grooves, and thus they are subject to the displacements of the pitches of the jacket portions as a stress from the outer side. Therefore, no stress is applied to the bare fibers on the inner side for transmitting optical signals.

Abstract: To resolve the problems of the manufacturing costs of an optoclectronic connector, and optoelectronic coupling integrated circuit chip (4) is mounted directly (12) into a package (1) of the connector. This package has an internal shielding metallization and metallizations (11) connected by microconnection techniques to pads (10) of the integrated circuit. The integrated circuit has laser diodes (8) on its surface also connected (13) to the pads (14) of this integrated circuit. These laser diodes are spaced out with respect to one another by a distance corresponding to a distance (21) between the optical fiber terminations (17, 20) in a standardized optical connector (16). The number of elements of the connector is reduced whereas, at the same time, its efficiency in terms of electrical consumption and in terms of transmission quality of a signal is improved.

Abstract: The present invention provides an optical switch for making part of incident light, which has been made incident on an optical waveguide, selectively emergent to a light emergence portion provided outside the optical waveguide. The optical switch includes a liquid crystal device for selective emergence of the incident light. An arbitrary layer of the liquid crystal device is set such that letting &Dgr;n be a difference between a refractive index n0 of the optical waveguide and a refractive index n1 of the arbitrary layer of the liquid crystal device, “d” be a thickness of the arbitrary layer, and &lgr; be a wavelength of the incident light, the values of &Dgr;n, “d”, and &lgr; satisfy a condition of 2.20×10−3≦|&Dgr;n·d·&lgr;−1|≦3.03×10−3.