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Automatic power control(APC) for Vcsel driver

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surianova

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Hi all,

I'm currently designing a Vcsel driver that has an Automatic Power Control (APC). I am refering the journal "An Integrated Direct-Coupled 10-Gb/s Driver
for Common-Cathode VCSELs", A.A. Ciubotaru. The journal and APC diagram is shown in the attachment.

I have few questions and hope someone can help me:

1. How to determine the transfer function btw the Vcsel and photodiode Monitor?

2. How to simulate the E-O and O-E i.e. Vcsel and photodiode Monitor?

3. What is the critical issue in designing APC circuit?

Any input are all welcome.

regards,
surianova
 

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