To take into account the traffic growth on the Warsaw PoP, we will add 2 * 100G to our backbone on this POP distributed as follows:
+ 1 * 100G between Amsterdam and Warsaw
+ 1 * 100G between Frankfurt and Warsaw

After this operation, we will have a total capacity of 300G between Amsterdam and Warsaw and 300G between Frankfurt and Warsaw.
These two optical paths are totally different.

Update(s):

Date: 2016-05-26 17:07:10 UTC
Production is on between Amsterdam and Warsaw!

We do not see CRCs and the traffic is correctly loadbalanced:

ams-1-n7(config-if)# sh inter Eth5/4,Eth6/6 | i \"input rate\"
30 seconds input rate 1308175336 bits/sec, 816004 packets/sec
input rate 1.31 Gbps, 816.00 Kpps; output rate 14.32 Gbps, 1.45 Mpps
...
30 seconds input rate 1436010288 bits/sec, 821740 packets/sec
input rate 1.44 Gbps, 821.74 Kpps; output rate 14.31 Gbps, 1.45 Mpps


ams-1-n7(config-if)# sh inter Eth5/4,Eth6/6 | i CRC
0 runts 0 giants 0 CRC/FCS 0 no buffer
0 runts 0 giants 0 CRC/FCS 0 no buffer