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M02066-EVME Datasheet(PDF) 11 Page - M/A-COM Technology Solutions, Inc. |
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M02066-EVME Datasheet(HTML) 11 Page - M/A-COM Technology Solutions, Inc. |
11 / 20 page Functional Description 02066-DSH-001-D Mindspeed Technologies ® 9 Preliminary Information / Mindspeed Proprietary and Confidential 3.3 Modulator The M02066 modulation output is optimized for driving a 25 Ω load; the minimum required voltage at OUT+ and OUT- is 0.6V. To interface with the laser diode, a matching resistor (RD) is required for impedance matching. An RC shunt network is necessary to compensate for the laser diode parasitic inductance, thereby improving the optical eye. Typical values are RSHUNT = 39Ω, CSHUNT = 3.9 pF. These values will need to be optimized for a specific laser.Any capacitive loading at the cathode of a laser diode will degrade the optical output performance. An inductor is used to isolate the BIAS pin from the laser cathode. See Figure 3-1. The modulator output stage is designed to drive up to 85mA in either AC-coupled or DC-coupled mode. DC- coupled performance depends on the laser used. RMODSET determines the modulation current according to the following formula: IMOD = 350/RMODSET Figure 3-2 shows the modulation current for a given RMODSET resistor. Figure 3-2. Modulation Current vs. RMODSET Modulation C urrent in m A 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 0 1020 3040 Rmodse t (kohms) |
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