title: 4 channel × 10 Gb/s bidirectional optical subassembly using silicon optical bench with precise passive optical alignment.
abstract: We demonstrate an advanced structure for optical interconnect consisting of 4 channel × 10 Gb/s bidirectional optical subassembly (BOSA) formed using silicon optical bench (SiOB) with tapered fiber guiding holes (TFGHs) for precise and passive optical alignment of vertical-cavity surface-emitting laser (VCSEL)-to-multi mode fiber (MMF) and MMF-to-photodiode (PD). The co-planar waveguide (CPW) transmission line (Tline) was formed on the backside of silicon substrate to reduce the insertion loss of electrical data signal. The 4 channel VCSEL and PD array are attached at the end of CPW Tline using a flip-chip bonder and solder pad. The 12-channel ribbon fiber is simply inserted into the TFGHs of SiOB and is passively aligned to the VCSEL and PD in which no additional coupling optics are required. The fabricated BOSA shows high coupling efficiency and good performance with the clearly open eye patterns and a very low bit error rate of less than 10-12order at a data rate of 10 Gb/s with a PRBS pattern of 231-1.
authors.forename: Eun Kyu
authors.initials: EK
authors.lastname: Kang
authors.forename: Yong Woo
authors.initials: YW
authors.lastname: Lee
authors.forename: Sooraj
authors.initials: S
authors.lastname: Ravindran
authors.forename: Jun Ki
authors.initials: JK
authors.lastname: Lee
authors.forename: Hee Ju
authors.initials: HJ
authors.lastname: Choi
authors.forename: Gun Wu
authors.initials: GW
authors.lastname: Ju
authors.forename: Jung Wook
authors.initials: JW
authors.lastname: Min
authors.forename: Young Min
authors.initials: YM
authors.lastname: Song
authors.forename: Ik-Bu
authors.initials: IB
authors.lastname: Sohn
authors.forename: Yong Tak
authors.initials: YT
authors.lastname: Lee