title: Parallel free-space optical interconnect based on arrays of vertical-cavity lasers and detectors with monolithic microlenses.
abstract: We investigate the use of low-threshold 980-nm vertical-cavity surface-emitting lasers for free-space optical interconnects. The vertical-cavity surface-emitting lasers and backilluminated detectors are monolithically integrated with microlenses on the back sides of the growth substrates to eliminate the necessity of external optics. With a channel pitch of 250 mum, an interconnect length between boards of the order of 5 to 10 mm with a ?50-mum lateral alignment tolerance can be achieved without external relay optics. The complete link is modeled to predict the system's efficiency and maximum bit rate. Data transmission at 500 Mbits/s per channel is demonstrated. The data rate was limited by parasitics, not the inherent bandwidth of the laser diodes.
authors.forename: E M
authors.initials: EM
authors.lastname: Strzelecka
authors.forename: D A
authors.initials: DA
authors.lastname: Louderback
authors.forename: B J
authors.initials: BJ
authors.lastname: Thibeault
authors.forename: G B
authors.initials: GB
authors.lastname: Thompson
authors.forename: K
authors.initials: K
authors.lastname: Bertilsson
authors.forename: L A
authors.initials: LA
authors.lastname: Coldren