1 files changed, 99 insertions, 0 deletions
diff --git a/src/devices/ring.h b/src/devices/ring.h
new file mode 100644
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--- /dev/null
+++ b/src/devices/ring.h
@@ -0,0 +1,99 @@
+#pragma once
+
+#include <systemc.h>
+
+#include <waveguide.h>
+#include <directional_coupler.h>
+#include <optical_output_port.h>
+#include <optical_signal.h>
+
+/** A unidirectional waveguide module. */
+class Ring : public sc_module {
+public:
+    // Ports
+    /** The optical input port. */
+    sc_port<sc_signal_in_if<OpticalSignal>> p_in;
+    /** The optical output port. */
+    sc_port<sc_signal_out_if<OpticalSignal>> p_out;
+
+    // Timed ports writers
+    /** Timed writer to the output port.
+     *
+     * @sa DelayedWriter
+     * */
+    OpticalOutputPort m_out_writer;
+
+    sc_signal<OpticalSignal> sig_in;
+    sc_signal<OpticalSignal> sig_internal_0;
+    sc_signal<OpticalSignal> sig_internal_1;
+    sc_signal<OpticalSignal> sig_out;
+    DirectionalCoupler dc;
+    Waveguide wg;
+
+    // Member variables
+    /** The attenuation inside the waveguide, in dB/cm. */
+    double m_attenuation_dB_cm = 0.2;
+    /** The effective index of the waveguide */
+    double m_neff = 2.2111;
+    /** The group index of the waveguide */
+    double m_ng = 2.2637;
+
+    /** The coupling from waveguide to ring, in dB. */
+    double m_cross_power_dB = 10*std::log10(0.5) - 0.15;
+    double m_through_power_dB = 10*std::log10(0.5) - 0.15;
+    double m_cross_phase_rad = M_PI / 2;
+    double m_through_phase_rad = M_PI / 2;
+
+    /** The radius of the ring in um. */
+    double m_radius_um = 0;
+
+    // Processes
+    /** Main process of the module.
+     *
+     * It copies the input to the output, after attenuation and delay.
+     *
+     *   **SystemC type:** thread
+     *
+     *   **Sensitivity list:** p_in
+     * */
+    void on_port_in_changed();
+
+    /** Constructor for Waveguide
+     *
+     * @param name name of the module
+     * @param length_cm length of the waveguide in cm
+     * */
+    Ring(sc_module_name name, double length_cm = 30e-6)
+        : sc_module(name)
+        , m_out_writer("out_delayed_writer", p_out)
+        , dc((std::string(name) + ".DC1").c_str())
+        , wg((std::string(name) + ".WG1").c_str())
+    {
+        dc.p_in1(sig_in);
+        dc.p_in2(sig_internal_1);
+        dc.p_out1(sig_out);
+        dc.p_out2(sig_internal_0);
+
+        wg.p_in(sig_internal_0);
+        wg.p_out(sig_internal_1);
+
+        p_in(sig_in);
+        p_out(sig_out);
+
+        setLength(length_cm);
+        
+        SC_HAS_PROCESS(Waveguide);
+
+        SC_THREAD(on_port_in_changed);
+        sensitive << p_in;
+    }
+
+    void setRadius(double radius_um) {
+        wg.setLength(2 * M_PI * radius_um * 1e-4);
+        m_radius_um = radius_um;
+    }
+
+    void setLength(double length_cm) {
+        setRadius(length_cm * 1e4 / 2 / M_PI);
+    }
+};