Coherent light generators – Particular beam control device – Having particular beam control circuit component
Patent
1981-09-30
1983-05-24
Sikes, William L.
Coherent light generators
Particular beam control device
Having particular beam control circuit component
372 26, H01S 313
Patent
active
043853870
ABSTRACT:
The invention relates to a method for the control of the preconduction current for laser diodes which are employed as light transmitters in the transmission stages of light wave guide transmission systems. In such laser diodes, a sharp bend occurs in the lower part of the light current characteristic curve which separates an upper characteristic curve area with great steepness from a lower characteristic curve area with minimum steepness and comparatively high cut-in retardation. Therefore, such laser diodes are operated with a preconduction current whose magnitude corresponds to the threshold current occurring in the characteristic curve bend. Due to aging and temperature influences, displacements of the characteristic curve bend can occur so that a control of the preconduction current is required. To this end, the invention provides that an oscillation of comparatiely lower frequency and low amplitude be superimposed on the preconduction current. A part of the light emitted by the laser diode is monitored for the occurrence of this additional oscillation. The inventive preconduction current regulation of laser diodes is particularly employable in light wave guide transmission systems with high transmission velocities.
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patent: 3815045 (1974-06-01), Ito
patent: 3898583 (1975-08-01), Shuey
patent: 3946335 (1976-03-01), DeLoach, Jr. et al.
patent: 4009385 (1977-02-01), Sell
patent: 4019048 (1977-04-01), Maione et al.
patent: 4081670 (1978-04-01), Albanese
patent: 4109217 (1978-08-01), Brackett et al.
Jr. Leon Scott
Siemens Aktiengesellschaft
Sikes William L.
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