//VerilogA for ring,basicreso,veriloga

`include "constants.vams"
`include "disciplines.vams"

module basicreso(Ipow,Iphase,Ilam,Opow,Ophase,Olam);
    parameter integer modespec = 1 from [1:2];
    parameter integer alpha_use_dBm = 1 from [0:1];
    parameter real l_bus = 1e-3 from [0:inf);
    parameter real r_ring = 7.5e-6 from [0:inf);
    parameter real attenu_bus_te = 0 from [0:inf);
    parameter real attenu_bus_tm = 0 from [0:inf);
    parameter real attenu_ring_te = 0 from [0:inf);
    parameter real attenu_ring_tm = 0 from [0:inf);
    parameter real phasedelay_bus_te = 0;
    parameter real phasedelay_bus_tm = 0;
    parameter real phasedelay_ring_te = 0;
    parameter real phasedelay_ring_tm = 0;
    parameter real neff_te = 2.6 from (0:inf);
    parameter real neff_tm = 2.6 from (0:inf);
    parameter real coupling_ring_te = 0.145 from [0:1];
    parameter real coupling_ring_tm = 0.145 from [0:1];
    parameter real reffreq = 193.1T from (0:inf);
    parameter real n_gv_te = 4.2 from (0:inf);
    parameter real n_gv_tm = 4.2 from (0:inf);
    parameter real disper_te = 0 from [0:inf);
    parameter real disper_tm = 0 from [0:inf);
    //parameter real coupling_tem = 0;

    input Ipow,Iphase,Ilam;
    output Opow,Ophase,Olam;
    electrical Ipow,Iphase,Ilam,Opow,Ophase,Olam;

    real eeir,eeii,emir,emii;
    real eeor,eeoi,emor,emoi;
    real t11r,t11i,t12r,t12i,t21r,t21i,t22r,t22i;
    real beta_te,beta_tm;
    real alpha_bus_te,alpha_bus_tm,alpha_ring_te,alpha_ring_tm;
    real beta_bus_ter,beta_bus_tei,beta_bus_tmr,beta_bus_tmi,beta_ring_ter,beta_ring_tei,beta_ring_tmr,beta_ring_tmi;
    real t_te,t_tm,theta_ter,theta_tei,theta_tmr,theta_tmi;
    real c1e1r,c1e1i,c1e2r,c1e2i,c1m1r,c1m1i,c1m2r,c1m2i;
    real c11r,c11i,c11m,c12r,c12i,c12m;
    real c21r,c21i,c22r,c22i;
    real l_ring=2*`M_PI*r_ring;
    real freq;
    real iph;

    analog begin
        freq=`P_C/V(Ilam);
        iph=V(Iphase)/360.0*2*`M_PI;
        if (modespec == 1) begin
            eeir=sqrt(V(Ipow))*cos(iph);
            eeii=sqrt(V(Ipow))*sin(iph);
            emir=0;
            emii=0;
        end
        else if (modespec == 2) begin
            eeir=0;
            eeii=0;
            emir=sqrt(V(Ipow))*cos(iph);
            emii=sqrt(V(Ipow))*sin(iph);
        end

        beta_te=2*`M_PI*reffreq/`P_C*neff_te+2*`M_PI/`P_C*n_gv_te*(freq-reffreq)-`M_PI*`P_C*disper_te/pow(reffreq,2)*pow(freq-reffreq,2);
        beta_tm=2*`M_PI*reffreq/`P_C*neff_tm+2*`M_PI/`P_C*n_gv_tm*(freq-reffreq)-`M_PI*`P_C*disper_tm/pow(reffreq,2)*pow(freq-reffreq,2);
        if (alpha_use_dBm == 0) begin
            alpha_bus_te=attenu_bus_te;
            alpha_bus_tm=attenu_bus_tm;
            alpha_ring_te=attenu_ring_te;
            alpha_ring_tm=attenu_ring_tm;
        end
        else if (alpha_use_dBm == 1) begin
            alpha_bus_te=attenu_bus_te/10.0*ln(10);
            alpha_bus_tm=attenu_bus_tm/10.0*ln(10);
            alpha_ring_te=attenu_ring_te/10.0*ln(10);
            alpha_ring_tm=attenu_ring_tm/10.0*ln(10);
        end

        beta_bus_ter=beta_te;
        beta_bus_tei=-0.5*alpha_bus_te;
        beta_bus_tmr=beta_tm;
        beta_bus_tmi=-0.5*alpha_bus_tm;
        beta_ring_ter=beta_te;
        beta_ring_tei=-0.5*alpha_ring_te;
        beta_ring_tmr=beta_tm;
        beta_ring_tmi=-0.5*alpha_ring_tm;

        t_te=sqrt(1-coupling_ring_te);
        t_tm=sqrt(1-coupling_ring_tm);
        theta_ter=beta_ring_ter*l_ring-phasedelay_ring_te/360.0*`M_PI*2;
        theta_tei=beta_ring_tei*l_ring;
        theta_tmr=beta_ring_tmr*l_ring-phasedelay_ring_tm/360.0*`M_PI*2;
        theta_tmi=beta_ring_tmi*l_ring;

        c1e1r=1-t_te*exp(-theta_tei)*cos(theta_ter);
        c1e1i=-t_te*exp(-theta_tei)*sin(theta_ter);
        c1e2r=t_te-exp(-theta_tei)*cos(theta_ter);
        c1e2i=exp(-theta_tei)*sin(theta_ter);
        c11m=pow(t_te-exp(-theta_tei)*cos(theta_ter),2)+pow(exp(-theta_tei)*sin(theta_ter),2);
        c11r=(c1e1r*c1e2r-c1e1i*c1e2i)/c11m;
        c11i=(c1e1r*c1e2i+c1e1i*c1e2r)/c11m;

        c1m1r=1-t_tm*exp(-theta_tmi)*cos(theta_tmr);
        c1m1i=-t_tm*exp(-theta_tmi)*sin(theta_tmr);
        c1m2r=t_tm-exp(-theta_tmi)*cos(theta_tmr);
        c1m2i=exp(-theta_tmi)*sin(theta_tmr);
        c12m=pow(t_tm-exp(-theta_tmi)*cos(theta_tmr),2)+pow(exp(-theta_tmi)*sin(theta_tmr),2);
        c12r=(c1m1r*c1m2r-c1m1i*c1m2i)/c12m;
        c12i=(c1m1r*c1m2i+c1m1i*c1m2r)/c12m;

        c21r=exp(beta_bus_tei*l_bus)*cos(-beta_bus_ter*l_bus-phasedelay_bus_te/360.0*`M_PI*2);
        c21i=exp(beta_bus_tei*l_bus)*sin(-beta_bus_ter*l_bus-phasedelay_bus_te/360.0*`M_PI*2);
        c22r=exp(beta_bus_tmi*l_bus)*cos(-beta_bus_tmr*l_bus-phasedelay_bus_tm/360.0*`M_PI*2);
        c22i=exp(beta_bus_tmi*l_bus)*sin(-beta_bus_tmr*l_bus-phasedelay_bus_tm/360.0*`M_PI*2);

        t11r=c11r*c21r-c11i*c21i;
        t11i=c11r*c21i+c11i*c21r;
        t12r=0;
        t12i=0;
        t21r=0;
        t21i=0;
        t22r=c12r*c22r-c12i*c22i;
        t22i=c12r*c22i+c12i*c22r;

        eeor=t11r*eeir-t11i*eeii+t12r*emir-t12i*emii;
        eeoi=t11r*eeii+t11i*eeir+t12r*emii+t12i*emir;
        emor=t21r*eeir-t21i*eeii+t22r*emir-t22i*emii;
        emoi=t21r*eeii+t21i*eeir+t22r*emii+t22i*emir;

        if (modespec == 1) begin
            V(Opow) <+ eeor*eeor+eeoi*eeoi;
            V(Ophase) <+ atan2(eeoi,eeor)*360.0/(2*`M_PI);
        end
        else if (modespec == 2) begin
            V(Opow) <+ emor*emor+emoi*emoi;
            V(Ophase) <+ atan2(emoi,emor)*360.0/(2*`M_PI);
        end
        V(Olam) <+ V(Ilam);
    end
endmodule