13 December 2001 Free-space optical backplanes based on beaconlike links or on a ring bus
Author Affiliations +
Abstract
We studied the feasibility of two different topologies for board-to-board free-space optical interconnects: a unidirectional ring and a beacon-type star. In each node of the ring bus, the incident VCSEL beam is split both to the next node and to the detector. The star consist of beacon-like nodes based on cones; in the transmitter it reflects the VCSEL beam into all directions on the PCB plane and in the receivers it reflects the incoming beams towards the detector. 3-D models of the optical systems were optimized considering realistic mechanical requirements and tolerances of a typical PCB system. The power budgets and optomechanical tolerances were analyzed by ray-trace simulations. With four nodes and total length of 80 cm, the simulated path loss of the ring bus was 27 dB. At the corresponding 40-cm range, the beacon link had 38 dB signal attenuation. At the same bit-rate, the ring bus provides longer separation between nodes whereas the beacon system allows more nodes. The ring bus also enables parallel interconnects, but the alignment requirements would be very tight. The beacon link was demonstrated. The resulted attenuation was 10 dB higher than in the simulations, mostly due to losses in the receiver optics.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mikko Karppinen, Jukka-Tapani Maekinen, Antti Kemppainen, Marianne Borenius, Pentti Karioja, "Free-space optical backplanes based on beaconlike links or on a ring bus", Proc. SPIE 4455, Micro- and Nano-optics for Optical Interconnection and Information Processing, (13 December 2001); doi: 10.1117/12.450429; http://dx.doi.org/10.1117/12.450429
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
Receivers

Signal attenuation

Transmitters

Sensors

Vertical cavity surface emitting lasers

Tolerancing

Free space optics

RELATED CONTENT

Recent developments in computed tomography at GSECARS
Proceedings of SPIE (September 20 2010)
Remote sensing of H2O at 0.94 um
Proceedings of SPIE (August 19 1998)
Guidewave surface plasmon-polariton sensors
Proceedings of SPIE (February 09 2009)
Performance of OFDM with PCF configuration in WDM-PON
Proceedings of SPIE (December 14 2011)

Back to Top