Fig. 7From: Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technologyWafer map (a) and histogram (b) for the insertion loss of a wire TM FGC from the first test field. The evaluation wavelength is 1625 nm. The mean coupling loss is − 3.9 dB and the 3σ interval is ±0.3 dBBack to article page