Peak optical power control circuit for laser driver

Patent · Tue Oct 06 04:00:00 EDT 1987

OSTI ID:6035959

Burley, G S

An apparatus for controlling the peak power of a light output signal of an injection laser is described, comprising: drive means for applying a drive current to the laser to modulate its light output in dependence upon an input signal having a predetermined power spectrum; detection means for detecting light output from the laser and providing a corresponding signal; filter means for filtering the corresponding signal to provide a filtered signal having a bandwidth significantly less than that of the laser output signal; peak optical power detection means for responding to the filtered signal to provide a signal proportional to the peak amplitude of the laser output signal; and comparator means for comparing such proportional signal with a reference that is predetermined relative to the predetermined power spectrum and in dependence upon such comparison controlling the drive means to vary the modulating drive current and control the peak power of the laser.

• Assignee: Northern Telecom Limited, Montreal
• Patent Number(s): US 4698817
• OSTI ID: 6035959
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLITUDES
COMPARATOR CIRCUITS
CURRENTS
DESIGN
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
ENERGY SPECTRA
FILTERS
LASERS
MODULATION
MONITORING
OPERATION
OPTICAL FILTERS
OPTICS
PEAK LOAD
POWER CONDITIONING CIRCUITS
RADIATIONS
SIGNALS
SPECTRA
VISIBLE RADIATION