Abstract:
An optical add/drop multiplexing (OADM) device includes two MMI structures connected by a MI/MZI waveguide structure comprising a wavelength selector that includes phase shifted Bragg gratings. The OADM multiplexer transmits a wavelength channel selected in advance and reflects all other channels to achieve a drop functionality. Simultaneously, a further channel may be added to the multiplexer at the same side as the channel selected in advance is output. The further channel preferably is centered around the same wavelength as the channel selected in advance. The further channel is transmitted through the Bragg gratings and is superimposed with the other channels to achieve an add functionality.
Abstract:
A fiber including a fiber grating and at least one refractive index modifier interfacing the fiber grating, the at least one refractive index modifier selectively introducing a refractive-index change on the fiber grating.
Abstract:
A coupler-multiplexer permutation switch (CMPS) integrates multiplexng and switching functions on a single substrate. It has a single-mode/multi-mode backward coupler followed by a digital optical switch (DOS). In the CMPS, the single-mode waveguide channels are phase-matched through a grating with the corresponding, backward-propagating modes of a multi-mode waveguide. The different modes are subsequently separated in a digital optical switch. Different permutations are obtained by electronically controlling an effective-index distribution of DOS output waveguides.
Abstract:
A reciprocating optical modulator includes a continuous light path fulfilling an amplification function, an optical modulation part formed on the light path, a first optical band-pass filter and a second optical band-pass filter formed to nip the optical modulation part therebetween and a device to introduce exciting light for exciting the light path. The optical modulation part, first and second optical band-pass filters and device are disposed on the light path as formed in a single optical crystal or in a multiplicity of optical crystals. The first optical band-pass filter admits incident light and reflects light having the incident light modulated. The second optical bandpass filter reflects the incident light and emits the light having the incident light modulated. The modulator can also include a third optical band-pass filter disposed between the optical modulation part and the second optical band-pass filter for removing the incident light.
Abstract:
A reciprocating optical modulator includes a continuous light path fulfilling an amplification function, an optical modulation part formed on the light path, a first optical band-pass filter and a second optical band-pass filter formed to nip the optical modulation part therebetween and a device to introduce exciting light for exciting the light path. The optical modulation part, first and second optical band-pass filters and device are disposed on the light path as formed in a single optical crystal or in a multiplicity of optical crystals. The first optical band-pass filter admits incident light and reflects light having the incident light modulated. The second optical bandpass filter reflects the incident light and emits the light having the incident light modulated. The modulator can also include a third optical band-pass filter disposed between the optical modulation part and the second optical band-pass filter for removing the incident light.
Abstract:
A tunable fiber optic component providing environmental isolation, thermal tuning, and mechanical tuning and a method of tuning a fiber optic component using application of substantially simultaneous varying of temperature and mechanical strain is disclosed. A method of using a tunable fiber optic component, for example, a distributed feedback fiber laser, to compensate variations in an optical system, and a method of making a tunable fiber optic component are also disclosed.
Abstract:
A tunable fiber optic component providing environmental isolation, thermal tuning, and mechanical tuning and a method of tuning a fiber optic component using application of substantially simultaneous varying of temperature and mechanical strain is disclosed. A method of using a tunable fiber optic component, for example, a distributed feedback fiber laser, to compensate variations in an optical system, and a method of making a tunable fiber optic component are also disclosed.
Abstract:
The invention relates to a method and a device for controlling the refractive index in the core of an optical fiber. According to the invention, an optical fiber is provided with a longitudinal electrode running along the core of the fiber. An electric current is passed through the electrode to induce ohmic heating thereof, causing thermal expansion and consequently a compressing force upon the core of the fiber. This compression of the core leads to induced changes in the refractive index in the direction of the compressing force, and hence induces or alters birefringence in the core.
Abstract:
A grating coupled surface plasmon resonance optical modulator is disclosed. A electro-optic polymer dielectric is deposited on the metallic surface of a diffraction grating to provide a metal/dielectric interface. A surface plasmon will propagate at the metal/dielectric interface in a resonant condition, e.g., when the metal surface is illuminated by transverse magnetic (TM) polarized light of the appropriate wavelength, angle of incidence and phase velocity. In the present invention, phase velocity is controlled by the diffraction grating. A transparent electrode deposited on the electro-optic layer allows an electrical potential to be applied across the electro-optic polymer. The applied electrical potential (voltage) changes the index of refraction of the electro-optic polymer, thereby disrupting the resonant condition to produce an optically detectable change in reflectance of incident light from the metal layer. The disclosed grating coupled surface plasmon resonance optical modulator may be configured as an electronically or optically addressable array.
Abstract:
A thermo-optical device may use a heater to tune an optical device such as an optical switch, a Mach-Zehnder interferometer, or a variable optical attenuator, to mention a few examples. In some embodiments, polarization-dependent losses caused by the heating and power efficiency may be improved by defining a clad core including an optical core and cladding material on a substrate and covering the clad core on three sides with a heater.