摘要:
A light guiding element[300]for routing alight signal between an input port[301] and an output port or for blocking the propagation of the fight signal between the input and output ports depending on the state of the switching element. The guiding element utilizes a beam splitter[310] for separating the input light signal into physically separated first and second polarized light signals, the first light signal having a polarization that is orthogonal to that of the second light signal. A first polarization rotator[309] rotates the polarization of the first light signal such that the polarization of the first light signal is parallel to that of the second light signal. A first waveguide[331] having first and second states operates on the first light signal such that the first waveguide[331] guides the first light signal along a predetermined path in the first state while not guiding the first light signal in the second state. A second waveguide[332] having first and second states operates on the second light signal such that the second waveguide[332] guides the second light signal along a predetermined path in the first state while not guiding the second light in the second state. A second polarization rotator[317] rotates the polarization of the second light signal such that the polarization of the second light signal is orthogonal to that of the first light signal. A beam combiner[318] then combines the first and second light signals and couples the same to the output light port.
摘要:
A light guiding element[300]for routing alight signal between an input port[301] and an output port or for blocking the propagation of the fight signal between the input and output ports depending on the state of the switching element. The guiding element utilizes a beam splitter[310] for separating the input light signal into physically separated first and second polarized light signals, the first light signal having a polarization that is orthogonal to that of the second light signal. A first polarization rotator[309] rotates the polarization of the first light signal such that the polarization of the first light signal is parallel to that of the second light signal. A first waveguide[331] having first and second states operates on the first light signal such that the first waveguide[331] guides the first light signal along a predetermined path in the first state while not guiding the first light signal in the second state. A second waveguide[332] having first and second states operates on the second light signal such that the second waveguide[332] guides the second light signal along a predetermined path in the first state while not guiding the second light in the second state. A second polarization rotator[317] rotates the polarization of the second light signal such that the polarization of the second light signal is orthogonal to that of the first light signal. A beam combiner[318] then combines the first and second light signals and couples the same to the output light port.
摘要:
A switchable waveguide (200, 250, 300) having first and second states. In the first state, the waveguide (200, 250, 300) guides light of a signal wavelength along a predetermined path. In the second state, no guiding of the light occurs. The waveguide (200, 250, 300) includes a guide layer (110) of a guide material having a first index of refraction in the absence of an electric field and a second index of refraction in the presence of the electric field. The electric field is generated in a portion of the guide layer (110) by applying an appropriate electrical signal to a plurality of electrodes (213, 214, 23, 24, 25, 32, 33, 34) that define a guide region (24, 37, 218) in the guide layer (110). The guide region (24, 37, 218) has an index of refraction that is greater than that of the guide layer (110) in regions adjacent to the guide region (24, 37, 218). The electrodes (213, 214, 23, 24, 25, 32, 33, 34) are separated from the guide region (24, 37, 218) by a distance of at least one-half times the wavelength of the light being guided. The separation is maintained by arranging the electrodes such that the guide region (24, 37,218) is created at a location separated from the electrodes.
摘要:
A switchable waveguide (200, 250, 300) having first and second states. In the first state, the waveguide (200, 250, 300) guides light of a signal wavelength along a predetermined path. In the second state, no guiding of the light occurs. The waveguide (200, 250, 300) includes a guide layer (110) of a guide material having a first index of refraction in the absence of an electric field and a second index of refraction in the presence of the electric field. The electric field is generated in a portion of the guide layer (110) by applying an appropriate electrical signal to a plurality of electrodes (213, 214, 23, 24, 25, 32, 33, 34) that define a guide region (24, 37, 218) in the guide layer (110). The guide region (24, 37, 218) has an index of refraction that is greater than that of the guide layer (110) in regions adjacent to the guide region (24, 37, 218). The electrodes (213, 214, 23, 24, 25, 32, 33, 34) are separated from the guide region (24, 37, 218) by a distance of at least one-half times the wavelength of the light being guided. The separation is maintained by arranging the electrodes such that the guide region (24, 37,218) is created at a location separated from the electrodes.