Title:
DFB LASER WITH LATERAL BRAGG GRATINGS AND FACET BRAGG REFLECTORS ETCHES IN ONE STEP
Document Type and Number:
WIPO Patent Application WO2005124951
Kind Code:
A8
Abstract:
A distributed feedback laser comprises: a waveguide (17) extending along a longitudinal axis; a Bragg grating structure (21) arranged with respect to the waveguide to interact with electromagnetic radiation propagating along the waveguide so as to provide distributed feedback along the waveguide to enhance a mode of said radiation; and first facet means arranged at a first end of the waveguide to reflect propagating electromagnetic radiation back along the waveguide. The first facet means comprises a first Bragg reflector structure (3). In certain embodiments the first Bragg reflector structure and the Bragg grating structure are substantially different. For example, the Bragg grating may comprise transverse elements for lateral coupling with guided radiation, and the reflector may comprise a periodic structure of semiconductor material (41) and air gaps in the radiation path. The laser may have a second Bragg reflector structure (5) at the opposite end of the waveguide. Fabrication methods are described.
Inventors:
HOGG RICHARD (GB)
GROOM KRISTIAN (GB)
GROOM KRISTIAN (GB)
Application Number:
PCT/GB2005/002395
Publication Date:
April 27, 2006
Filing Date:
June 17, 2005
Export Citation:
Assignee:
UNIV SHEFFIELD (GB)
HOGG RICHARD (GB)
GROOM KRISTIAN (GB)
HOGG RICHARD (GB)
GROOM KRISTIAN (GB)
International Classes:
H01S5/22; H01S5/125; H01S5/20; (IPC1-7): H01S5/22
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