diff --git a/drivers/src/main/java/org/onosproject/driver/handshaker/CalientFiberSwitchHandshaker.java b/drivers/src/main/java/org/onosproject/driver/handshaker/CalientFiberSwitchHandshaker.java
index df4dfa5..270008f 100644
--- a/drivers/src/main/java/org/onosproject/driver/handshaker/CalientFiberSwitchHandshaker.java
+++ b/drivers/src/main/java/org/onosproject/driver/handshaker/CalientFiberSwitchHandshaker.java
@@ -17,7 +17,14 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
+import org.onlab.util.Spectrum;
+import org.onosproject.net.ChannelSpacing;
+import org.onosproject.net.DefaultOchSignalComparator;
 import org.onosproject.net.Device;
+import org.onosproject.net.GridType;
+import org.onosproject.net.OchSignal;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.behaviour.LambdaQuery;
 import org.onosproject.openflow.controller.OpenFlowOpticalSwitch;
 import org.onosproject.openflow.controller.PortDescPropertyType;
 import org.onosproject.openflow.controller.driver.AbstractOpenFlowSwitch;
@@ -41,9 +48,24 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 
-public class CalientFiberSwitchHandshaker extends AbstractOpenFlowSwitch implements OpenFlowOpticalSwitch {
+/**
+ * Driver for Calient S160 Optical Circuit Switch. Untested on Calient S320 but probably works ok.
+ *
+ * Driver implements custom handshaker, and rewrites flow stats as expected by the device. Port stats are currently
+ * not supported.
+ *
+ * The device consists of OMS ports only, and each port exposes lambda resources covering the whole
+ * usable optical spectrum (U to O band, see {@link Spectrum} for spectrum definitions).
+ */
+public class CalientFiberSwitchHandshaker
+        extends AbstractOpenFlowSwitch
+        implements OpenFlowOpticalSwitch, LambdaQuery {
 
     private final AtomicBoolean driverHandshakeComplete = new AtomicBoolean(false);
     private List<OFCalientPortDescStatsEntry> fiberPorts = new ArrayList<>();
@@ -178,4 +200,22 @@
 
         super.sendMsg(newMsg);
     }
+
+    @Override
+    public SortedSet<OchSignal> queryLambdas(PortNumber port) {
+        // S160 data sheet
+        // Wavelength range: 1260 - 1630 nm
+        long startSpacingMultiplier = Spectrum.U_BAND_MIN.subtract(Spectrum.CENTER_FREQUENCY).asHz() /
+                ChannelSpacing.CHL_12P5GHZ.frequency().asHz();
+        long stopSpacingMultiplier = Spectrum.O_BAND_MAX.subtract(Spectrum.CENTER_FREQUENCY).asHz() /
+                ChannelSpacing.CHL_12P5GHZ.frequency().asHz();
+        List<OchSignal> lambdas = IntStream.rangeClosed((int) startSpacingMultiplier, (int) stopSpacingMultiplier)
+                .mapToObj(x -> new OchSignal(GridType.FLEX, ChannelSpacing.CHL_12P5GHZ, x, 1))
+                .collect(Collectors.toList());
+
+        SortedSet<OchSignal> result = new TreeSet<>(new DefaultOchSignalComparator());
+        result.addAll(lambdas);
+
+        return result;
+    }
 }