Abstract
A quad, small form-factor pluggable 28 Gbps optical transceiver design scheme is proposed. It is capable of transmitting 50 Gbps of data up to a distance of 40 km using modulation signals with a level-four pulse-amplitude. The proposed scheme is designed using a combination of electro-absorption-modulated lasers, transmitter optical sub-assembly, low-cost positive-intrinsic-native photodiodes, and receiver optical sub-assembly to achieve standard performance and low cost. Moreover, the hardware and firmware design schemes to implement the optical transceiver are presented. The results confirm the effectiveness of the proposed scheme and the performance of the manufactured optical transceiver, thereby confirming its applicability to real industrial sites.
Highlights
semiconductor optical amplifier (SOA) has been applied to the C form-factor pluggable (CFP), the CFP2 optical transceiver, which is a large form-factor type owing to the high cost of parts, the additional thermoelectric cooler (TEC) control, and its slarge size; it can amplify the optical signal to be lower than the avalanche photodiode (APD)
The QSFP28 optical transceiver internal hardware of the proposed design scheme consists of PAM4 digital signal processing (DSP) integrated circuit (IC) for PAM4 and duplication, electroabsorption-modulated laser (EML)–transmitter optical sub-assemblies (TOSA) for transmission, and positive-intrinsic-negative photo diode (PIN-PD) receiver optical sub-assemblies (ROSA) for reception
The access tests for the internal registers the QSFP28 were conducted through the assessment board to verify the host interface implementation
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. SOA has been applied to the C form-factor pluggable (CFP), the CFP2 optical transceiver, which is a large form-factor type owing to the high cost of parts, the additional thermoelectric cooler (TEC) control, and its slarge size; it can amplify the optical signal to be lower than the APD method to the level of the receiver sensitivity. These existing studies have successfully long-distance transfers but have not experimented with packaged transceiver types.
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