Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: An optical fiber communication method includes the steps of: providing an optical fiber that includes a core, and a second-order Bragg grating structure formed on the core; and emitting a data-carrying optical signal to an outer peripheral surface of the optical fiber that corresponds to the second-order Bragg grating structure in a radial direction of the optical fiber, so that the data-carrying optical signal is coupled into the core of the optical fiber via the second-order Bragg grating structure for transmission therein.

Abstract: The present invention includes an optical waveguide with a grating and a method of making the same for increasing the effectiveness of the grating. In one example, the grating is at least partially covered by a liner layer disposed on at least a portion of a grating; and a cover layer disposed on the liner layer, wherein a first material selected for the core and ridges and a second material selected for the liner layer are selected to provide a difference in the index of refraction between the first and second material that is sufficient to provide a contrast therebetween.

Abstract: A method of generating an optical radiation signal is to be implemented by an optical radiation signal generating device including a dual beam generating unit for receiving an original optical input signal, and a second-order fiber Bragg grating (FBG). The dual-beam generating unit is configured to generate, from the original optical input signal, first and second optical input signals having a phase difference therebetween. The second-order FBG is configured to receive the first and second optical input signals, and to radiate an optical radiation signal by interference between the first and second optical input signals.

Abstract: A method of generating an optical radiation signal is to be implemented by an optical radiation signal generating device including a dual beam generating unit for receiving an original optical input signal, and a second-order fiber Bragg grating (FBG). The dual-beam generating unit is configured to generate, from the original optical input signal, first and second optical input signals having a phase difference therebetween. The second-order FBG is configured to receive the first and second optical input signals, and to radiate an optical radiation signal by interference between the first and second optical input signals.

Abstract: A light extracting device includes a dual light generating unit and a first order Bragg grating unit. The dual light generating unit is for receiving an input optical signal and a control signal, and for generating from the input optical signal first and second optical signals that have a phase difference there between. The phase difference is associated with the control signal. The first order Bragg grating unit is for receiving the first and second optical signals from the dual light generating unit, and for causing optical interference to occur between the first and second optical signals within a predetermined wavelength range to result in first and second output optical signals.

Abstract: A light extracting device includes a dual light generating unit and a first order Bragg grating unit. The dual light generating unit is for receiving an input optical signal and a control signal, and for generating from the input optical signal first and second optical signals that have a phase difference there between. The phase difference is associated with the control signal. The first order Bragg grating unit is for receiving the first and second optical signals from the dual light generating unit, and for causing optical interference to occur between the first and second optical signals within a predetermined wavelength range to result in first and second output optical signals.

Abstract: A system and a method of manufacture for a semiconductor laser with a continuous waveguide ridge extending the length of the laser. The continuous waveguide ridge is positioned through the center of the optical components of the semiconductor laser. The optical components including the waveguide ridge may be distributed Bragg reflectors (DBRs), outcoupling gratings, and phase controllers. The illustrated embodiments include lateral-grating grating-stabilized edge-emitting lasers and lateral-grating grating-stabilized surface-emitting (GSE) lasers. Both loss-coupled and non-loss-coupled lateral-grating components are illustrated.

Abstract: A single-mode grating-outcoupled surface emitting (GSE) semiconductor laser architecture is provided. This architecture enables high speed modulation of the GSE laser, which is accomplished by only varying the relative phase of counter propagating waves in the outcoupler grating region of the lasing cavity.

Abstract: An array of VCSELs is made to operate coherently by coupling light to and from all elements with a common waveguide. The common waveguide can be fabricated on the wafer or separately, and allows enough optical power to mix between the individual lasers for phase-locking to occur.

Abstract: A grating (18) couples the waveguide region (36) of a semiconductor laser (11) to a dielectric waveguide (26). The waveguide region of the laser includes a mirror (15) at one end thereof and an absorber (19) at the other end thereof. The dielectric waveguide includes a reflector (24) therein to reflect a portion of the light coupled from the laser to the dielectric waveguide back into the laser waveguide region.

Abstract: An array of VCSELs is made to operate coherently by coupling light to and from all elements with a common waveguide. The common waveguide can be fabricated on the wafer or separately, and allows enough optical power to mix between the individual lasers for phase-locking to occur.

Abstract: A grating (461) assisted coupling of a semiconductor waveguide to a dielectric waveguide (451) is provided with one or more reflective stacks (330, 332, 334) to enhance the coupling efficiency. The glass or dielectric core (458) may be efficiently butt-coupled to the core of an optical fiber (470). A laser and semiconductor waveguide, reflective stacks coupling grating, and dielectric waveguide are integrated on a single substrate. Further, multiple lasers (410, 420, 430, 440) with differing lasing frequencies may be integrated and their outputs grating coupled into a single dielectric waveguide (450) for wavelength division multiplexing.

Abstract: A grating (18) couples the waveguide region of a semiconductor laser (11) to a dielectric waveguide (21). The waveguide region of the laser includes a mirror (15) at one end thereof and an absorber (24) at the other end thereof. The dielectric waveguide includes a reflector therein to reflect a portion of the light coupled from the laser to the dielectric waveguide back into the laser waveguide region.

Abstract: A grating (18) couples the waveguide region (36) of a semiconductor laser (11) to a dielectric waveguide (26). The waveguide region of the laser includes a mirror (15) at one end thereof and an absorber (19) at the other end thereof. The dielectric waveguide includes a reflector (24) therein to reflect a portion of the light coupled from the laser to the dielectric waveguide back into the laser waveguide region.

Abstract: The invention is an improved semiconductor laser diode which includes a substrate having a pair of substantially parallel grooves in a major surface thereof with a land therebetween, a first confinement layer overlying the major surface of the substrate and the surfaces of the grooves; a guide layer overlying the first confinement layer, an active layer overlying the guide layer and the second confinement layer overlying the active layer. The improvement is a guide layer which tapers in increasing thickness from that portion of the layer over the land and whose surface, contacting the active layer, is concave in shape, and an active layer which is thickest over the land between the grooves and tapers in decreasing thickness in the lateral direction. This structure provides a positive lateral waveguide index for light propagating in the active and guide layers resulting in a reduced threshold current for lasing action and a reduced spontaneous emission near threshold.