Determination of a disconnect response metric for an optical device

A method comprising:

• discontinuing, in response to determining that a disconnect response metric test is to be initiated, transmission of a test optical signal by a test device to a device under test (DUT) coupled to the test device, wherein the DUT is to discontinue transmission of a response optical signal to the test device upon detection of a loss of the test optical signal;
• detecting a loss of the response optical signal by the test device;
• and
• determining, by the test device, a disconnect response metric of the DUT based on a time of discontinuation of the transmission of the test optical signal and a time of detection of the loss of the response optical signal, wherein the disconnect response metric is indicative of a duration that the DUT has taken to discontinue the transmission of the response optical signal after the discontinuation of the transmission of the test optical signal.