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A high-density multi-rate VCSEL transceiver with CDRs was developed. We succeed in suppressing the jitter of optical link by developing CDR for the receiver, and realized a 24 to 34-Gb/s x4 interconnect with retime function.
A 4 × 25.8-Gb/s −13.7-dBm sensitivity optical receiver composed of a 0.13-μm SiGe BICMOS transimpedance amplifier and an 850-nm 250μm-pitch photodiode is demonstrated. The crosstalk penalty is less than 0.3 dB for all channels.
We show an 850-nm multimode VCSEL-based optical transmitter with a 25-jum-core polymer waveguide designed analytically to suppress a modal dispersion in a multimode fiber. 40-Gb/s NRZ, 100-m error-free transmission over a standard OM3 fiber is demonstrated.
The 25.78-Gb/s VCSEL transceiver with retimer-embedded ICs was firstly developed. We succeeded to suppress the power as low as 200 mW/lane for retime function and realized transmission over 300-m by jitter suppression with the retimer.
To meet increasing demands for server computational power, high-density, multilane links with a data rate exceeding 25Gb/s/lane are needed. An optical transceiver with a retiming capability would significantly enhance the usability of the link by extending the reach. Such optical transceivers should operate without an external clock source since a small form factor is imperative. The optical link...
High-speed and high-density interconnections between racks and modules in the high-performance computing systems and data centers are currently being developed. The transmission range of conventional electrical interconnections is limited due to the bandwidth of electrical channels. VCSEL-based optical interconnection technologies are a promising solution for overcoming bandwidth bottlenecks in large...
We demonstrated a high-speed FPC-based optical receiver above 40-Gb/s using novel lens-integrated technique on a small-active-area-diameter PD. The integrated-lens allows us to use high-bandwidth small-diameter photodiodes with low coupling loss.
We developed a 40-Gb/s VCSEL transmitter by over-driving a 25-Gb/s VCSEL using our novel pre-emphasis with group-delay compensation. This pre-emphasis improved the jitter property, and realized a 40-Gb/s operation with large optical modulation amplitude.
We have developed cost-effective technologies for optical transceivers with over 10-Gb/s operations in high bandwidth interconnection. These include optical engines on flexible printed circuit and 25Gb/s operation with pre-emphasis overdrive of conventional VCSEL for 10Gb/s.
A compact card-edge optical transceiver with a cost-effective flexible printed circuit (FPC) based module structure has been developed. Clear eye-openings operating at 200 Gb/s (8-channel × 25 Gb/s) were successfully demonstrated. The optical power budget more than 4.5 dB was obtained even when the channel-to-channel cross-talk was included.
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