摘要:
A method and apparatus is disclosed for signaling a switch (240, 460, 560) of the target destination of a data packet (100) having a header (110) specifying the destination address and an information frame (120). The data packet (100) along with a separate instance of the header (110) is subcarrier multiplexed and simultaneously transmitted. The separate header (110) is transmitted at a lower speed than the data packet (100) permitting detection and processing by less expensive receivers.
摘要:
An optical preamplifier includes a semiconductor optical amplifier (23) monolithically integrated with an optical detector (21) and electrically isolated from the detector (21) by an isolation region (22). The isolation region (22) consists of a low-loss, preferably transparent, insulating material whose index of refraction is matched to at least the refractive index of the amplifier (23), leading to reduced facet reflectivity at the amplifier output facet. Alternative device structures may include a waveguiding layer in the isolation region, a grating integrated with or following the optical amplifier, and a tuning region positioned between the amplifier and isolation region for filtering spontaneous emission.
摘要:
A novel method for reducing the facet reflectivities of semiconductor light sources and amplifiers concerns the use of a bulk (non-waveguiding) index-matched regrown end cap region (10, 11) at both of the major facet surfaces (17, 18, respectively) of the amplifier (16). The amplifier (16) has a tilted stripe geometry which, in combination with the end cap regions (10, 11), enable the amplifier (16) to reproducibly achieve facet reflectivities of less than 10⁻⁵ while avoiding a facet coating step. The improved optical amplifier is more amenable to mass production and less sensitive to both wavelength and polarization.
摘要:
A novel method for reducing the facet reflectivities of semiconductor light sources and amplifiers concerns the use of a bulk (non-waveguiding) index-matched regrown end cap region (10, 11) at both of the major facet surfaces (17, 18, respectively) of the amplifier (16). The amplifier (16) has a tilted stripe geometry which, in combination with the end cap regions (10, 11), enable the amplifier (16) to reproducibly achieve facet reflectivities of less than 10⁻⁵ while avoiding a facet coating step. The improved optical amplifier is more amenable to mass production and less sensitive to both wavelength and polarization.
摘要:
A method and apparatus is disclosed for signaling a switch (240, 460, 560) of the target destination of a data packet (100) having a header (110) specifying the destination address and an information frame (120). The data packet (100) along with a separate instance of the header (110) is subcarrier multiplexed and simultaneously transmitted. The separate header (110) is transmitted at a lower speed than the data packet (100) permitting detection and processing by less expensive receivers.
摘要:
A monolithically integrated optical preamplifier (10) comprises an amplifying region, an optical detection region (40) for detecting amplified light, and an optically transparent and electrically insulating isolation region (30) interposed between the amplifying and optical detection regions. The amplifying region achieves reduced facet reflectivity by being designed to have a large spot size, single-traverse mode waveguide amplifier (20) oriented at an angle (0) with respect to a crystal plane through the preamplifier (10). The isolation region (30) is preferably an air gap.
摘要:
An optical preamplifier includes a semiconductor optical amplifier (23) monolithically integrated with an optical detector (21) and electrically isolated from the detector (21) by an isolation region (22). The isolation region (22) consists of a low-loss, preferably transparent, insulating material whose index of refraction is matched to at least the refractive index of the amplifier (23), leading to reduced facet reflectivity at the amplifier output facet. Alternative device structures may include a waveguiding layer in the isolation region, a grating integrated with or following the optical amplifier, and a tuning region positioned between the amplifier and isolation region for filtering spontaneous emission.
摘要:
A monolithically integrated optical preamplifier (10) comprises an amplifying region, an optical detection region (40) for detecting amplified light, and an optically transparent and electrically insulating isolation region (30) interposed between the amplifying and optical detection regions. The amplifying region achieves reduced facet reflectivity by being designed to have a large spot size, single-traverse mode waveguide amplifier (20) oriented at an angle (0) with respect to a crystal plane through the preamplifier (10). The isolation region (30) is preferably an air gap.