US 2003/0185.509 A1 Oct. 2, 2003 An optical filter for filtering a spectral profile of an optical
Related US Application Data Signal for providing an output Signal having a desire gain …

The present invention is directed to the obtaining offilters that exhibit more uniform pass
bands, good suppression of side-bands, and relatively sharp roll-off between pass-bands …

Aband-pass filter written into an optical waveguide includes at least one Bragg grating
creating coupling between two propagation modes. In one version the pitch of the grating is …

An optical filter is adapted for selectively transmitting electromagnetic radiation within a
wavelength passband bounded by a pair of stop bands of relatively low transmis sivity. The …

In accordance with the invention. there is provided, an attenuator capable of controllably
variably attenuating at least two wavelengths of light independently. comprising: an optical …

An optical filter is adapted for selectively transmitting electromagnetic radiation within a
wavelength passband bounded by a pair of stop bands of relatively low transmis sivity. The …

57 ABSTRACT A narrow bandwidth Bragg grating reflector comprises at least two Bragg
reflection gratings positioned to form a Fabry-Perot etalon, with an optical gain medium …

An optical waveguide provided with a linearly chirped Bragg reflective grating can be
employed as a device that provides linear dispersion compensation. The amount of the …

The optical filtering device comprises an optical input receiving the optical Signal; an
elongated waveguide con nected to the input and having a modified transverse dimen Sion …

57 ABSTRACT A tunable optical filter device has a wavelength selec tive optical filter that
includes a grating structure ar ranged in a waveguide structure. The grating structure is …