Abstract: Techniques and systems for dynamically controlling polarization of an optical signal by using various feedback controls, and by combining both feed-forward and feedback controls. Various dynamic control algorithms for such systems and other optical systems have been disclosed.

Abstract: Devices and techniques for monitoring spectrum of light. For example, a fiber spectral monitoring device and associated technique are described for monitoring spectral information in light based on an interferometer design.

Abstract: The present invention provides an optoelectronic device, a method of manufacture therefore, or an optical communications system including the optoelectronic device. The optoelectronic device may include a substrate and a waveguide located within the substrate. Additionally, the waveguide may include a first portion having a width, depth, and refractive index, and a second portion having a different width, depth and refractive index.

Abstract: The present invention provides a device, a method of making the device, and a system incorporating the same. In one embodiment, the device includes a substrate that has first and second opposing surfaces and first and second thicknesses, wherein the second thickness is less than the first thickness, and the first surface is substantially planar. The device further includes a conductive trace having an input end and an output end and located over the first surface of the substrate, wherein at least one of the input end or output end is aligned with the second substrate thickness.

Abstract: The present invention provides a device, a method of making the device, and a system incorporating the same. In one embodiment, the device includes a substrate that has first and second opposing surfaces and first and second thicknesses, wherein the second thickness is less than the first thickness, and the first surface is substantially planar. The device further includes a conductive trace having an input end and an output end and located over the first surface of the substrate, wherein at least one of the input end or output end is aligned with the second substrate thickness.

Abstract: The present invention provides an optoelectronic device, a method of manufacture therefore, or an optical communications system including the optoelectronic device. The optoelectronic device may include a substrate and a waveguide located within the substrate. Additionally, the waveguide may include a first portion having a width, depth, and refractive index, and a second portion having a different width, depth and refractive index.

Abstract: The present invention provides an optical device and a method of manufacture therefor. In one advantageous embodiment, the optical device may include a waveguide located within a substrate, wherein the waveguide has an index of refraction. The optical device may further include a grated coupler located over the waveguide, such that the grated coupler redirects a portion of radiation passing through the waveguide out of the waveguide, and a detector located over the grated coupler that receives the redirected portion. Advantageously, the grated coupler may have an index of refraction different than the index of refraction of the waveguide.

Abstract: Two modes in the waveguide are excited by establishing the input light polarization at forty-five degrees so that the modes can be excited equally. After propagating through the waveguide, the two modes are forced into one polarization by a polarizing fiber so that they can interfere, and the resulting novel straight channel modulator is compact and does not require strict single mode operation since the interference is in the polarizing fiber, which is a very good mode filter.