The laser driver circuit may further comprise a circuit to combine a replica of the base current with a reference modulation current to provide the modulation current. Described is a laser driver circuit comprising a bipolar transistor for transmitting a modulated power signal to a laser device. For digital modulation, there are high-speed laser diode driver ICs from Maxim and others that are made just for this purpose. If you'd rather roll your own though, using it in the collector circuit is a good way to drive it.
Active1 month ago
The laser power was to be modulated using isolated PWM input signal for obvious reasons of turning the laser on and off, but also to enable controlling the average laser power with PWM duty cycle. Theoretical Background. 2W 445nm Laser Diode Driver Project. 10Gb laser datasheet, cross reference, circuit and application notes in pdf format.
$begingroup$What could cause a laser source with fiber coupled laser diodes to have extreme loss of power? The laser diodes have a wavelength of 658nm and have an output rated at 60mW but it seems as though the optical channels actually output ranges between 58 to 70mW.
During some troubleshooting I noticed that one of my optical channels had a loss of -13dB (95%) so I cleaned the fibers to make sure there was no blockage but when I remeasured I was only given a small gain of maybe +30dB (0.1%). I decided to spot check other channels and noticed that they also had significantly dropped in power.
The sources had been on for awhile so I thought that perhaps the sources had been on for too long. I shutdown everything down and proceeded to do a power check the next day after they had cooled but unfortunately the output was still extremely low.
Laser Diode Driver
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$endgroup$2 Answers
$begingroup$What could cause a laser source with fiber coupled laser diodes to have extreme loss of power?
I would suggest the designer was not aware of the critical thermal characteristics in the datasheet.
Hint Do not exceed 50'C junction temp where efficacy takes a 'nose-dive'
![Laser diode driver circuit diagram Laser diode driver circuit diagram](https://hackadaycom.files.wordpress.com/2017/04/ethernet-featured_bright.png?w=646)
As a reference I have another 60mW 658nm Laser diode in a TO-18 can
From this I extracted the thermal characteristics and replotted so you can understand them easier. Canon drivers for mac. Keep in mind when they spec the performance at 25'C this always uses an infinite heatsink for any semiconductor, which would be the same as a pulse test with no thermal rise.
It is a lesson for you to learn to read datasheets and understand them perfectly before designing or testing.
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$endgroup$$begingroup$Free lan drivers. After some more troubleshooting, I saw that that the bulkhead connectors were becoming loose which I believe is causing a misalignment between the two fiber connectors.
Laser Diode Driver Ic
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