The present invention provide an optical circuit device hav ing: an optical circuit; a
polarization beam splitter/combiner for splitting an incoming light beam into two polarization …

(57) ABSTRACT A method and apparatus for shutting off a Source of optical power to an
optical fiber in the event of a cut in the fiber are disclosed. Embodiments of the invention are …

A fiber gain medium provided by a rare-earth doped fiber (10) is contained in a first resonant
cavity by end reflectors (12, 18). The reflector (12) is wavelength selective to limit the …

An optical transmitter is disclosed having a temperature stabilization system for an optical
filter for maintaining constant the frequency response of the filter. The filter is mounted within …

Abstract Multiwavelength Raman pumps for Raman amplifiers are provided. The
multiwavelength Raman pumps may be based on semiconductor devices that have multiple …

Solely lightwaves required to be wavelength converted are filtered out from the input
broadband WDM lightwaves and (56) References Cited are wavelength converted by use of …

An optical transmitter is disclosed including a Widely tunable laser coupled to a periodic
optical spectrum reshaper (OSR) to convert frequency modulated pulses from the laser into …

(57) ABSTRACT A polarization-insensitive integrated wavelength converter System includes
polarization-separating, polarization rotating and wavelength-converter Structures …

An wave division multiplexed (WDM) optical transmitter is disclosed including a directly
modulated laser array and a planar lightwave chip (PLC) having a plurality of OSRs that …

Low-cost FP lasers can be implemented in the upstream links of a WDM PON system by
configuring them for single-mode operation. In a typical embodiment, an FP laser at a …