* An Add-drop filter

** Circuit parameters
.assign lambda0 = 1.55e-6
.assign neff = 2.3
.assign length_2pi = {lambda0}/{neff}
.assign k = 0.85

** Include definition of add-drop subcircuit
.include circuits/add_drop_sub.cir

.subckt test p1 p2
.assign L=3e-3

.subckt test 1 p2 L={L}
wg1 1 p2 length={L}
.ends

x1 p1 1 test
x2 1 2 test L=0
wg1 2 p2 L=1e-3

.ends

** Circuit definition
vlsrc1 in values=[[1e-9,1,{lambda0}], [2e-9,2,], [3e-9, -2,], [4e-9, 0,]]

;cwsrc1 in wl=1.55e-6 power=1

x1 in drop out add add_drop_filter radius_ring={length_2pi}*109.5
x2 out out_ test

** Simulator options
.options abstol=1e-12 reltol=1e-6 timescale=-15

* DC analysis (CW sweep) parameters
.assign lambda_min = {lambda0} - 15e-9
.assign lambda_max = 2*{lambda0}-{lambda_min}
.assign dlambda = 0.1*1e-9

** Analysis
;.dc WL(cwsrc1) {lambda_min} {lambda_max} {dlambda} P(cwsrc1) 0 1 0.01
;.dc WL(cwsrc1) {lambda_min} {lambda_max} {dlambda}
;.dc P(cwsrc1) 0 1 0.1
;.dc FREQ(cwsrc1) 192e12 194e12 1e9
;.dc WL(cwsrc1)
;.op
.tran
;.dc wl(osrc1)=[{lambda_min},{lambda_max},{npoints}]