Fig. 5: Measurements in deployed optical fibers.
From: Thermal light with enhanced oscillating bunching in field-tested photon-counting LIDAR

a Map of the deployed fiber network between KTH at campus Alba Nova and Ericsson Research lab at Kista, this map is only an illustration of the fiber network; the exact route is classified. b Range measurement in an 87 km fiber network (40 km deployed optical fiber and 47 km additional fiber spools) with 40 dB losses and 30,000 counts/second background noise from crosstalk.