Four-Channel Integrated Receiver with a Built-In Spatial Demultiplexer Optics for 100Gb/s Ethernet

Assembly Technologies for Integrated Transmitter/Receiver Optical Sub-Assembly Modules

“…6 is applied to the TOSA. The TOSA and ROSA packages excluding the LC receptacle, fiber and FPCs are 15.1 mm L × 6.5 mm W × 5.6 mm H, and 17.0 mm L × 12.0 mm W × 7.0 mm H [17], respectively, which comply with the QSFP28 and CFP2 form factors. For both of the OSAs, two FPCs are attached directly to the ceramic feedthroughs formed at the rear of the packages without any lead-pins so as to reduce the package width.…”

“…While there is an advantage of simplified assembly, this structure involves the difficulty of chip fabrication. For the latter, hybrid, type, an OSA constructed by integrating a planar lightwave circuit (PLC) [11]- [14] or builtin spatial optics with four LDs has been developed [15]- [17]. For these structures, the optics tend to be complex, reducing the manufacturing yield due to unwanted misalignment of the assembly, so a precise alignment technique is essential.…”

“…In this paper, we report a compact integrated four-lane 25 Gb/s TOSA (15.1 mm × 6.5 mm × 5.6 mm) and ROSA (17.0 mm × 12.0 mm × 7.0 mm) [17] with built-in Spatial Mux/Demux optics, using three key techniques, a precise lens-alignment technique [14], [16], low-loss built-in Spatial Mux/Demux optics [17] and a matched electrical connection for the high-frequency signals [18]. We demonstrate electrical-optical performance which fully meets the 100GbE specification.…”

“…We demonstrate electrical-optical performance which fully meets the 100GbE specification. Figure 2 outlines the structures of the four-lane integrated TOSA and ROSA [17]. For the TOSA, four 25 Gb/s electrical signals are input from a flexible printed circuit (FPC) and four optical signals are generated at different wavelengths in the 1.3 μm band by individual electroabsorption-modulator lasers (EMLs), mounted on a thermos-electric cooler (TEC).…”