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Total Power Consumed by an Entire Opto-electronic Link

Total Power Consumed by an Entire Opto-electronic Link. The total power consumed by an entire opto-electronic link is given by:. For zero length link. Power required by photodiode. Power required by laser driver. Power required by laser.

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Total Power Consumed by an Entire Opto-electronic Link

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  1. Total Power Consumed by an Entire Opto-electronic Link

  2. The total power consumed by an entire opto-electronic link is given by: For zero length link Power required by photodiode Power required by laser driver. Power required by laser Power required by TransImpedance Amplifier for converting photocurrent to voltage Power required by Clock and Data Recovery circuitry

  3. PDriver According to various references we have: Dominated by the capacitance of the laser, about 10 pF. Bit/second Vdd=Typical 3.3 V Switching factor = duty cycle of the link (modulation and activity dependant)

  4. PVCSEL Steady state power dissipation of a VCSEL (vertical cavity laser – or conventional diode laser). About 1.8 V 6 mA for VCSEL  50 mA for conventional Laser diode (LD)  0.7V About 0.2 V  20 mA for VCSEL  80 mA for LD

  5. Pphotodiode The photodiode requires a bias voltage and the associated power is negligible respect to TIA power. APDs require high voltage sources that are not energetically negligible: Typical power required by APD bias circuitry is 10 mW (activation time hundreds ms) see datasheet of LT3482. P TIA Dark current 40 nA About 15 V Output capacitance of amplifier, about 1 pF Amplifier gain at DC and in band about 5000 Output voltage swing (3V) 3.3 V About photodiode capacitance (1 pF) =2Bitrate

  6. PCDR Capacitance of the clock and data recovery unit. About 1 pF

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