H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/155 (2006.01) H01S 5/0683 (2006.01) H01S 5/068 (2006.01)
Patent
CA 1210070
LASER TRANSMITTER Abstract of the Disclosure In a fiber optic laser controller for use in digital transmission a digital data stream and a DC bias are applied to the laser. During a monitoring period, the DC bias is stepped from a zero to a peak current. At a first threshold current, lasing occurs in response to digital '1' modulating current but not in response to digital '0' modulating current. At a second higher threshold current lasing occurs in response to both digital '1' and '0'. The threshold currents are identifiable as peaks in the second derivative d2L/dI2 where L is the light output for an applied bias current I. A feedback circuit including a photodiode, D/A and A/D converters and a microprocessor controller are used to maintain the bias current at the second threshold current in spite of changes in the laser characteristics caused by device aging or temperature change. - i -
466469
Nortel Networks Limited
Wilkinson Stuart
LandOfFree
Laser transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser transmitter will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1226551