I am studying the use of TLK2501 SerDes for a laser-base inter-satellite Free Space Optical long haul link (4000 km). The goal is to establish a 500 Mbit/sec to 2 Gbit/sec data link. I have two questions
1 I've seen that TLK2501 has a minumum operating frequency. In Tx side this constraint can be avoided replacing each af "my" bits by N succesive bits of the same value (eg: a '1' at 500Mbps can be loaded as five succesive '1' at 2.5Gbps). Is this approach valid for the receiver? What are the limitations of contiguous bits for CDR circuits at the RX end?
2. After the optical detector and AGC stages, the received signal will have an estimated SNR of 12dB. How can I evaluate the receiver BER? Is this SNR of acceptable for CDR circuits? We have no atmospheric perturbations nor Doppler effects.
Any suggestions, AppNote, paper, or similar will be really appreciated. Thanks a lot
