Abstract: The present invention provides an optoelectronic device, a method of manufacture therefor and an optical communications system including the same. In an exemplary embodiment, the optoelectronic device includes a device body that includes an active region having a device length defined by a back facet and a front facet. The device includes an internal grating to enhance spectral performance. The optoelectronic device further includes an anti-reflective coating on the front facet and a grated waveguide located adjacent said front facet.

Abstract: A broadband partial reflector is located downstream from an optical combiner device. The partial reflector reflects a portion of the combined light back through the combiner device and back into the respective optical pump sources. There are no fiber gratings or other filters between the sources and the combiner device. Consequently, the sources are locked and/or stabilized according to the acceptance bandpass characteristics of the input ports of the combiner device. Since no gratings or other filters need to be located between the sources and the combiner device, the problem of insertion power loss due to spectral mismatch at the input ports can be avoided. In other words, self-aligned wavelength feedback stabilization is accomplished by reflecting a portion of the combined light signal back through the input ports of the combiner device.

Abstract: The invention is an optical apparatus and method of fabrication wherein an optical device such as a semiconductor laser includes a grating and a waveguide optically coupled to the grating. At least a portion of the waveguide coupled to the grating has a width which varies along the length of the waveguide in such a manner as to broaden the spectral line width of light output from the device. The width can be varied according to linear, sinusoidal or saw-tooth functions. A broadened line width permits pumping of a Raman amplifier at a high power without inducing any significant Brillouin Scattering.

Abstract: A semiconductor laser including a substrate layer, an n-doped quaternary layer disposed on the substrate layer, a quantum well layer disposed on the quaternary layer, and a cladding layer disposed on the quantum well layer. The structure of the laser creates an optical mode which is substantially more circular, and thus increases the efficiency of the laser when coupling to an optical fiber.

Abstract: The present invention provides an optoelectronic device, a method of manufacture therefor and an optical communications system including the same. In an exemplary embodiment, the optoelectronic device includes a device body that includes an active region having a device length defined by a back facet and a front facet. The device includes an internal grating to enhance spectral performance. The optoelectronic device further includes an anti-reflective coating on the front facet and a grated waveguide located adjacent said front facet.

Abstract: The present invention provides an optoelectronic device, a method of manufacture therefor and an optical communications system including the same. In an exemplary embodiment, the optoelectronic device includes a device body including an active region having a cavity length defined by a back facet and a front facet. The optoelectronic device may further include a diffraction grating optically coupled to the active region, wherein the diffraction grating has a grating length of less than about 25 percent of the cavity length.

Abstract: A broadband partial reflector is located downstream from an optical combiner device. The partial reflector reflects a portion of the combined light back through the combiner device and back into the respective optical pump sources. There are no fiber gratings or other filters between the sources and the combiner device. Consequently, the sources are locked and/or stabilized according to the acceptance bandpass characteristics of the input ports of the combiner device. Since no gratings or other filters need to be located between the sources and the combiner device, the problem of insertion power loss due to spectral mismatch at the input ports can be avoided. In other words, self-aligned wavelength feedback stabilization is accomplished by reflecting a portion of the combined light signal back through the input ports of the combiner device.

Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50 mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.

Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50 mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.