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Summary of Contents for Maxim MAX3865
- Page 1 Design Note: HFDN-18.0 Rev.1; 04/08 The MAX3865 Laser Driver with Automatic Modulation Control Maxim Integrated Products...
- Page 2 The MAX3865 Laser Driver with Automatic Modulation Control 1 Introduction Laser diodes for telecommunication applications are characterized by two principal parameters: • The threshold current, I , which can be defined as the minimum current through the laser diode that will support stimulated emission of photons (resulting in coherent optical output).
- Page 3 Figure 2. Feedback control of a laser Design Note HFDN-18.0 (Rev.1; 04/08) Maxim Integrated Products Page 3 of 9...
- Page 4 Something useful can be achieved by abandoning via a Pilot Tone the quest for large loop bandwidth, and replacing the high-gain amplifier by an integrator: Maxim’s MAX3865, achieves automatic modulation control by adding a small pilot tone to the laser τ amplifier current.
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Page 5: Detailed Description
At the Control Circuits Figure 4. Block diagram of the MAX3865 laser driver, which includes both APC and AMC Design Note HFDN-18.0 (Rev.1; 04/08) Maxim Integrated Products... - Page 6 These can degrade Bias output current is programmed in #3 by the data waveforms. connecting a resistor to ground: Design Note HFDN-18.0 (Rev.1; 04/08) Maxim Integrated Products Page 6 of 9...
- Page 7 The laser impedance is built out to 25Ω by a series resistor (approximately 20Ω), and an RC Figure 5. AC coupling of the MAX3865 to a snubber at least partially compensates for laser laser for operation with Vcc = 3.3V. The inductance.
- Page 8 The MAX3865 uses a different technique, In summary, the average optical power output and mark-density compensation. extinction ration in the AMC mode are given by:...
- Page 9 Any observed change in the optical at the open-collector-output pins BIAS_MON output from the system may be associated with the and MOD_MON, and noting when these approach latter, not with a failure of the MAX3865 to regulate limit values: correctly. Design Note HFDN-18.0 (Rev.1; 04/08)
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