Klayout simulation issue

[buttercutter]

I am trying to replicate Figure 1A of Fully on-chip photonic turnkey quantum source for entangled qubit/qudit state generation using KLayout tool.

What step did I miss other than "export netlist" ?

    No netlist available. Cannot run simulation.
    /home/phung/.klayout/salt/siepic_tools/python/SiEPIC/netlist.py:48
    /home/phung/.klayout/salt/siepic_tools/python/SiEPIC/netlist.py:38
    /home/phung/.klayout/salt/siepic_tools/python/SiEPIC/opics_netlist_sim.py:41
    /home/phung/.klayout/salt/siepic_tools/pymacros/Keybindings/Simulation/circuit_simulation OPICS.lym:7

Does this mean that I could not use OPICS ?

Warning: One of the waveguide segments has insufficient length to accommodate the desired bend radius.

Not sure how to get around this above quoted warning though.

Nevertheless, sagnac mirror waveguide's geometrical visualization is not perfect.