Abstract:
A ring cavity laser (20) has at least two facets (32,34) and a mechanism is provided to produce unidirectional propagation and light emission at a first wavelength. A source of laser light (60) at a second wavelength is injected into the cavity to reverse the direction of propagation and to produce emission at the second wavelength.
Abstract:
A surface-emitting laser (10), in which light is emitted vertically at one end from a 45.degree angled facet (22), includes a second end (28) having a perpendicular facet from which light is emitted horizontally, for monitoring.
Abstract:
A surface-emitting laser (see Fig. 2, Character 10), in which light is emitted vertically at one end from a near 45° angled facet, includes a second end (see Fig. 2, Character 28) having a perpendicular facet from which light is emitted horizontally, for monitoring. The surface-emitting laser (see Fig. 2, Character 10) comprises a divergence-compensating lens (see Fig. 21, Character 282) on the surface above the near 45°angled facet.
Abstract:
Abstract of the Disclosure A laser (22) and detector (24) integrated on corresponding epitaxial layers of a single chip (20) cooperate with on-chip and/or external optics (62) to couple light of a first wavelength emitted by the laser to a single external device such as an optical fiber (60) and to simultaneously couple light of a different wavelength received from the external device to the detector to provide bidirectional photonic operation. Multiple lasers and detectors may be integrated on the chip to provide multiple bidirectional channels.
Abstract:
A single-mode, etched facet distributed Bragg reflector laser includes an A1GalnAs/InP laser cavity (70), a front mirror stack (32) with multiple Fabry-Perot elements (60, 62, 64, 66), a rear DBR reflector (68), and rear detector. The front mirror stack elements and the rear reflector elements include input and output etched facets (72, 76), and the laser cavity is an etched ridge cavity, all formed from an epitaxial wafer (30) by a two-step lithography and CAIBE process.
Abstract:
Unidirectionality of lasers is enhanced by forming one or more etched gaps (78, 80) in the laser cavity. The gaps may be provided in any segment of a laser, such as any leg of a ring laser, or in one leg (62) of a V-shaped laser (60). A Brewster angle facet at the distal end of a photonic device coupled to the laser reduces back-reflection into the laser cavity. A distributed Bragg reflector is used at the output of a laser to enhance the side-mode suppression ratio of the laser.
Abstract:
A process for fabricating lasers capable of emitting blue light wherein a GaN wafer is etched to form laser waveguides and mirrors using a temperature of over 500 °C and an ion beam in excess of 500 V in CAIBE.
Abstract:
An etched-facet single lateral mode semiconductor photonic device is fabricated by depositing an anti reflective coating on the etched facet, and depositing a reflectivity modifying coating in a spatially controlled manner to modify the spatial performance of the emitted beam.