A system, comprising: a fiber distribution hub, FDH, (116, 400) of a passive optical network, PON,, the FDH including: a bulkhead having a plurality of passive optical couplers (120A, 120B, 200), each of the plurality of passive optical couplers having: a respective first port adapted to receive an end of a respective first optical fiber, a respective second port adapted to receive an end of a respective second optical fiber, and a respective passive optical activity indicator configured to expose (i) a portion of first light propagating in the respective first optical fiber when the first optical fiber is received in the first port, and (ii) a portion of second light propagating in the respective second optical fiber when the second optical fiber is received in the second port, and an image sensor configured to capture one or more images of the respective passive optical activity indicators of the plurality of passive optical couplers (120A, 120B, 200); and a computing device (126, 130, 136) configured to: configure a plurality of light sources of a plurality of respective optical terminals (106A, 106B) to transmit light according to a plurality of respective patterns, determine, based on the one or more images, which of the plurality of passive optical couplers (120A, 120B, 200) are receiving a first optical signal at their respective first port and/or receiving a second optical signal at their respective second port, and determine, based on the one or more images, connections of the plurality of optical terminals (106A, 106B) to ports of the plurality of passive optical couplers (120A, 120B, 200) based on which respective passive optical activity indicators are illuminated according to which respective patterns. a fiber distribution hub, FDH, (116, 400) of a passive optical network, PON,, the FDH including: a bulkhead having a plurality of passive optical couplers (120A, 120B, 200), each of the plurality of passive optical couplers having: a respective first port adapted to receive an end of a respective first optical fiber, a respective second port adapted to receive an end of a respective second optical fiber, and a respective passive optical activity indicator configured to expose (i) a portion of first light propagating in the respective first optical fiber when the first optical fiber is received in the first port, and (ii) a portion of second light propagating in the respective second optical fiber when the second optical fiber is received in the second port, and an image sensor configured to capture one or more images of the respective passive optical activity indicators of the plurality of passive optical couplers (120A, 120B, 200); and a bulkhead having a plurality of passive optical couplers (120A, 120B, 200), each of the plurality of passive optical couplers having: a respective first port adapted to receive an end of a respective first optical fiber, a respective second port adapted to receive an end of a respective second optical fiber, and a respective passive optical activity indicator configured to expose (i) a portion of first light propagating in the respective first optical fiber when the first optical fiber is received in the first port, and (ii) a portion of second light propagating in the respective second optical fiber when the second optical fiber is received in the second port, and a respective first port adapted to receive an end of a respective first optical fiber, a respective second port adapted to receive an end of a respective second optical fiber, and a respective passive optical activity indicator configured to expose (i) a portion of first light propagating in the respective first optical fiber when the first optical fiber is received in the first port, and (ii) a portion of second light propagating in the respective second optical fiber when the second optical fiber is received in the second port, and an image sensor configured to capture one or more images of the respective passive optical activity indicators of the plurality of passive optical couplers (120A, 120B, 200); and a computing device (126, 130, 136) configured to: configure a plurality of light sources of a plurality of respective optical terminals (106A, 106B) to transmit light according to a plurality of respective patterns, determine, based on the one or more images, which of the plurality of passive optical couplers (120A, 120B, 200) are receiving a first optical signal at their respective first port and/or receiving a second optical signal at their respective second port, and determine, based on the one or more images, connections of the plurality of optical terminals (106A, 106B) to ports of the plurality of passive optical couplers (120A, 120B, 200) based on which respective passive optical activity indicators are illuminated according to which respective patterns. configure a plurality of light sources of a plurality of respective optical terminals (106A, 106B) to transmit light according to a plurality of respective patterns, determine, based on the one or more images, which of the plurality of passive optical couplers (120A, 120B, 200) are receiving a first optical signal at their respective first port and/or receiving a second optical signal at their respective second port, and determine, based on the one or more images, connections of the plurality of optical terminals (106A, 106B) to ports of the plurality of passive optical couplers (120A, 120B, 200) based on which respective passive optical activity indicators are illuminated according to which respective patterns.