First Demonstration of Athermal Silicon Optical Interposers With Quantum Dot Lasers Operating up to 125 °C

Quantum Dot Laser for a Light Source of an Athermal Silicon Optical Interposer

“…Figure 7 shows the calculation results of energy cost of the light source against SSC loss using parameters of the fabricated optical interposer, which included wall-plug efficiency of a QD LD, SSC coupling loss, waveguide loss, modulator loss, splitter loss, photo detector sensitivity, and other excess loss. Figure 7 also shows the result obtained by Urino et al: 2.9 pJ/bit [4]. We demonstrated 12.5 Gbps data transmission in each two-branched channel with a minimum received power of -7 dBm.…”

“…This means that an optical link can be demonstrated at temperatures up to 120 °C taking into account the loss budget [2]. We also experimentally demonstrated error free operation up to 125 °C [4].…”

“…On the other hand, a light source on a silicon optical interposer mounted on LSI chips consumes more power as the temperature is increased by the heat generated in the LSIs (up to about 85 °C or higher) [3]. Because a laser diode (LD) serving as a light source is particularly sensitive to the effects of a temperature increase, we examined a temperature-insensitive hybrid integrated light source on a Si platform to apply a quantum dot (QD) LD with high-temperature characteristics [4]. Furthermore, to increase bandwidth density, we applied a small array LD as an optical interposer light source [5].…”

Quantum dot lasers for silicon photonics [Invited]

“…One approach, which is ready for immediate commercial adoption, is integration of quantum dot lasers via flip-chip bonding and butt coupling to "silicon optical interposer" chips consisting of spot size converters, optical modulators, photodetectors, and power splitters. Transceivers made with these components demonstrated error-free operation (bit-error-rate <10 −12 ) at 20 Gbps per channel from 25°C to 125°C without active adjustment of the modulator or photodiode across this temperature range [19]. With a footprint of 0.106 mm 2 per channel, this translates to a bandwidth density of 19 Tbps∕cm 2 .…”

Open-Access Silicon Photonics: Current Status and Emerging Initiatives

“…Demonstrations are reported to reach the ultimate solution of a monolithically integrated quantum-well or quantum-dot III-V laser source in Silicon Photonics [180]- [186]. Currently, the most mature solutions are provided by hybrid or heterogeneously integration of quantum well or quantum dot laser source with silicon photonics PICs [184], [187]- [189]. Openaccess platforms are actively engaged in developing the waferscale integration of light-sources on silicon PICs.…”