16 channels optical interface utilizing InP-based mode adapters combined with 30um intervals spaced fibre pitch converters

The performance of an optical connection is determined between 16 single mode fibres and an InP-based chip. The optical interface consists of a fibre pitch converter in combination with on-chip spot-size converters. All optical transitions are uniform spaced at 30 !m intervals. The coupling efficiencies are 3 dB / channel and the 1-dB alignment tolerances are 1.2 !m for both linear lateral x- and transversal ytranslations. The rotational 1-dB tolerance for the 'z roll position is ± 0.3°, measured at the outermost points of the fibres in the optical bus