Transmitter optical subassembly with volume phase holographic optics
AssigneeFinisar Corporation
InventorsJan Lipson, Zheng Wang, Mina Farr
Life of this patent
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Abstract
A means for optically coupling a semiconductor laser to an optical fiber is disclosed. In one embodiment, a volume phase holographic element is disposed on a light-emitting surface of a semiconductor laser. The volume phase holographic element acts as an aberration-corrector for a lens that is disposed between the semiconductor laser and the optical fiber. In this way, an inexpensive lens that is not aberration free can be used. In some embodiments, the volume phase holographic element converts a Gaussian light beam emitted by the semiconductor laser into an annular beam that is more suitable for long distance transmission in multimode fibers.
Claims9
A semiconductor laser comprising:
- a light-emitting surface;
- and
- a volume phase holographic element disposed on the light-emitting surface.
A transmitter optical sub-assembly, comprising:
- a semiconductor laser;
- an optical fiber;
- a lens disposed between the semiconductor laser and the optical fiber and configured to optically couple the semiconductor laser to the optical fiber;
- and
- a volume phase holographic element disposed between the semiconductor laser and the lens and configured to modify an aberration of the lens.
A transmitter optical sub-assembly, comprising:
- a semiconductor laser;
- an optical fiber;
- a volume phase holographic element disposed between the semiconductor laser and the optical fiber and configured to produce an annular light beam from a Gaussian light beam emitted by the semiconductor laser.
A method of fabricating a light-emitting device, the method comprising:
- depositing a layer of emulsion on a wafer of semiconductor laser diodes;
- forming volume phase holograms in the layer of emulsion;
- and
- separating individual ones of the semiconductor laser diodes from the wafer.
In a transmitter optical sub-assembly having a semiconductor laser and an emulsion layer disposed on a light-emitting surface of the semiconductor laser, a fiber, and a lens disposed between the semiconductor laser and the fiber, a method of modifying an aberration of the lens, the method comprising:
- transmitting light emitted by the semiconductor laser down the fiber;
- reflecting the transmitted light back through the fiber such that it emits from an end of the fiber facing the semiconductor laser;
- and
- forming a volume phase hologram in the emulsion layer with light emitted by the semiconductor laser and light emitted from the end of the fiber.
Dependencies are inferred from the claim text.