Ch6Sec5 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 6.5 2 Section 6.5 Laser Diode Operating Characteristics P (mW) 5 0 I (mA) I TH = threshold current Example: I TH = 75 mA Diode Voltages 2245 1.2 - 2 Volts Actual Ideal I TH 100
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Joseph C. Palais 6.5 3 Optical Power Optical Power 1 1 1 1 0 0 Input Current or Signal t t Digital Modulation i s I dc I TH LASER DIODE OPERATING CHARACTERISTICS
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Joseph C. Palais 6.5 4 i i s I dc Bias The dc bias, set just at (or near) threshold, makes the device turn on quicker for binary ones. LASER DIODE OPERATING CHARACTERISTICS Digital Modulation Signal
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Joseph C. Palais 6.5 5 Optical Power Optical Power Input Current (Signal) t Analog Modulation t P dc I dc i P sp I sp I TH LASER DIODE OPERATING CHARACTERISTICS
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Joseph C. Palais 6.5 6 The dc bias is set to operate in the middle of the linear region of the diode’s characteristic curve. LASER DIODE OPERATING CHARACTERISTICS Analog Modulation i s I dc Bias Signal i
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Joseph C. Palais 6.5 7 Temperature Dependence P (mW) 5 0 i (mA) 30°C 80°C LASER DIODE OPERATING CHARACTERISTICS 70 100
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Joseph C. Palais
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Ch6Sec5 - THE FIBER FORUM Fiber Optic Communications...

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