초록 ▼

The present invention provides greater capacity in a dynamic allocation of power. First, the invention requires the reduction, not the increase, of signal power in low traffic areas. Because this signal power reduction reduces interference in surrounding high traffic cell site areas, those high traf

The present invention provides greater capacity in a dynamic allocation of power. First, the invention requires the reduction, not the increase, of signal power in low traffic areas. Because this signal power reduction reduces interference in surrounding high traffic cell site areas, those high traffic cell site areas can re-direct some of this surplus power to support a greater voice and data traffic load. Accordingly, the invention increases capacity of voice and data communications in high traffic areas, where it is needed most, by lowering (and dynamically regulating) the signal power in low traffic cell site areas.

대표청구항 ▼

The present invention provides greater capacity in a dynamic allocation of power. First, the invention requires the reduction, not the increase, of signal power in low traffic areas. Because this signal power reduction reduces interference in surrounding high traffic cell site areas, those high traf

The present invention provides greater capacity in a dynamic allocation of power. First, the invention requires the reduction, not the increase, of signal power in low traffic areas. Because this signal power reduction reduces interference in surrounding high traffic cell site areas, those high traffic cell site areas can re-direct some of this surplus power to support a greater voice and data traffic load. Accordingly, the invention increases capacity of voice and data communications in high traffic areas, where it is needed most, by lowering (and dynamically regulating) the signal power in low traffic cell site areas. ilicon oxide having a lower refractive index than the core layer. 8. An optical waveguide mode transformer according to claim 1, wherein the core layer extends between two end surfaces of said waveguide structure, a said end surface at the input waveguide section including an antireflective coating, and a said end surface at the output waveguide section including a low reflectivity coating. 9. An external cavity solid state laser comprising: a solid state laser coupled to output a divergent beam, multimode optical signal, including a fundamental mode, to an optical waveguide mode transformer, said solid state laser and said optical waveguide mode transformer having anti-reflective coated neighboring end surfaces; said solid state laser and said optical waveguide mode transformer each having a low reflectivity coated opposite end surface; said optical waveguide mode transformer comprising a substrate supporting low refractive index cladding material on either side of a high refractive index core layer; said core layer including a lengthwise extending localized region of increased thickness defining a ridge upstanding from a surface of said core layer and spaced from opposite lateral edges of said core layer, said ridge having a height relative to the core layer thickness such that the ridge defines lateral waveguiding boundaries of at least said input and intermediate waveguide sections, said lengthwise extending ridge having a width that functionally changes along its length to accept said multimode optical signal output from said solid state laser and to transform said fundamental mode of said multimode optical signal to a single fundamental mode optical signal, without significant loss of intensity of said fundamental mode signal, to an output section of said optical waveguide mode transformer which supports single mode propagation of said fundamental mode optical signal. 10. An external cavity solid state laser according to claim 9, wherein said optical waveguide transformer core layer ridge is wide at the end of the optical waveguide transformer neighboring said laser and then transitions over a narrowing taper region to a narrow width supporting single mode propagation of said fundamental mode optical signal, said narrowing tapered region effecting said transformation of the fundamental mode of said multimode optical signal to said single, fundamental mode optical signal. 11. An external cavity solid state laser according to claim 10, wherein said optical waveguide transformer core layer ridge transitions from said narrowing tapered region over a increasing width taper section to a decreasing width taper section to said narrow width supporting single mode propagation of said fundamental mode optical signal. 12. An external cavity laser according to claim 9, including a single mode optical fiber coupled to receive said fundamental mode optical signal from said output section of the optical waveguide transformer. 13. An optical system comprising: a solid state laser coupled to output a divergent beam, multimode optical signal, including a fundamental mode, an optical waveguide mode transformer, and a cylindrical lens intermediate said solid state laser and said optical waveguide mode transformer, said solid state laser and said optical waveguide mode transformer having anti-reflective coated end surfaces; said solid state laser and said optical waveguide mode transformer each having a reflective coated opposite end surface, the reflective coating of said mode transformer opposite surface having a low reflectivity; said waveguide mode transformer comprising: an optical waveguide structure including a substrate supporting a high refractive index core layer between lower refractive index cladding layers, said core layer including a localized region of increased thickness defining a ridge upstanding from a surface of said core layer and spaced from opposite lateral edges of said core layer, said core layer inclu ding an input waveguide section having a wide ridge coupled by an intermediate waveguide section including a tapered ridge to an output waveguide ridge section; said input waveguide section ridge having a width to accept a multimode, including a fundamental mode, light input, said output waveguide section having a ridge width to support a single mode light output comprising said fundamental mode, and said tapered ridge section having a taper length enabling adiabatic transfer of said fundamental mode of said multimode light from said wide input waveguide section ridge to said output waveguide section ridge; said cylindrical lens positioned to receive said optical signal output by said solid state laser and to direct said signal to the wide input waveguide section of said optical waveguide mode transformer; and said antireflective coated end surface of the optical waveguide mode transformer being inclined at an angle to the antireflective coated end surface of said solid state laser. 14. An external cavity solid state laser comprising; a solid state laser coupled to output a divergent beam, multimode optical signal, including a fundamental mode, to a first optical waveguide mode transformer; said solid state laser and said optical waveguide mode transformer having anti-reflective coated neighboring front and back end surfaces, respectively; said solid state laser and said optical waveguide mode transformer each having a reflective coated opposite back and front end surfaces, respectively; and a second, feedback optical waveguide mode transformer device coupled to said solid state laser at said back end surface of the solid state laser; said first optical waveguide mode transformer comprising a substrate supporting low refractive index cladding material on either side of a high refractive index core layer; said core layer having a lengthwise extending ridge having a width that functionally changes along its length from a wide input section to accept said multimode optical signal output from said solid state laser and to transform said fundamental mode of said multimode optical signal to a single fundamental mode optical signal, without significant loss of intensity of said fundamental mode signal, to a narrow output section of said core layer that supports single mode propagation of said fundamental mode optical signal; said narrow output section perpendicularly intersecting said front end surface of the first optical waveguide mode transformer; and said wide input section intercepting said back end surface of the first optical waveguide transformer at a non-perpendicular angle; said solid state laser including an active region extending between and tilted at a non-perpendicular angle with respect to said front and back end surfaces of the solid state laser; said second, feedback optical waveguide transformer comprising a substrate supporting low refractive index cladding material on either side of a high refractive index core layer; said core layer having a lengthwise extending ridge having a width that functionally changes along its length from a wide input section to accept a multimode optical signal output from said back end surface of said solid state laser and to transform said fundamental mode of said multimode optical signal to a single fundamental mode optical signal, without significant loss of intensity of said fundamental mode signal, to a narrow output section of said core layer that supports single mode propagation of said fundamental mode optical signal; said narrow output section perpendicularly intersecting said reflective coated back end surface of the second optical waveguide mode transformer; and said wide input section intercepting the front end surface of the second optical waveguide transformer at a non-perpendicular angle; in each of said first and second optical waveguide mode transformers, said core layer including a localized region of increased thickness defining a ridge upstanding f