H - Electricity – 01 – S
Patent
H - Electricity
01
S
345/32
H01S 5/22 (2006.01) H01S 5/00 (2006.01) H01S 5/12 (2006.01) H01S 5/125 (2006.01) H01S 5/14 (2006.01)
Patent
CA 1265604
ABSTRACT OF THE DISCLOSURE The emission linewidth of a semiconductor laser can be reduced by operating it at a wavelength which is less than the wavelength of maximum gain at the threshold current, .lambda. max. An assembly for carrying out such operation comprises a ridge waveguide laser provided with a distributed feedback (DFB) grating. The period of the grating is selected to give a predetermined emission wavelength to the laser which is shorter than .lambda. max. The invention finds application in optical communications, particularly in coherent systems.
515884
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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