An electrical design and fabrication of a 12-channel optical transceiver with SiP packaging technology

Abstract

This paper presents an electrical design of a 6.25Gbps×12-channel parallel optical transceiver with SiP packaging technology. Considering such high speed, a low impedance and low noise power distribution network (PDN) is designed to suppress simultaneous switching noise (SSN) and a novel embedded capacitor filter is used to replace the conventional power supply filter. To minimize the impedance discontinuity of electrical channels, a signal integrity (SI) design flow based on Electromagnetic Analysis Method and Circuit Analysis Method is proposed. Following this design flow, the high speed link performs on a large bandwidth. With the electrical design, the optical transceiver is fabricated and tested.

A 10-Gbps × 12-Channel Pluggable Parallel Optical Transceiver Based on CXP Interface Specifications

“…In most cases, the width of gold fingers or pads is larger than that of the transmission traces, which results in capacitive mismatch. By cutting the ground reference plane directly below them, the impedance of gold fingers or pads can be increased, thereby decreasing the capacitive mismatch [7]. Compared with the optical transceiver supporting the transmission speed of 6.25 Gbps per channel proposed in [7], the optical transceiver proposed in this article supports the transmission speed of 10.3 Gbps per channel.…”

“…By cutting the ground reference plane directly below them, the impedance of gold fingers or pads can be increased, thereby decreasing the capacitive mismatch [7]. Compared with the optical transceiver supporting the transmission speed of 6.25 Gbps per channel proposed in [7], the optical transceiver proposed in this article supports the transmission speed of 10.3 Gbps per channel. Moreover, this optical transceiver is designed based on CXP interface specifications and is compatible with other communication equipment.…”

“…Moreover, this optical transceiver is designed based on CXP interface specifications and is compatible with other communication equipment. The optical transceiver reported in [7] represents an earlier evolutionary step toward the development of high data rate, low-power, and low-cost active optical cables. On the other hand, [7] focused on electrical design flow with little emphasis on the optical coupling structure, whereas this article discusses a new and highly simplified method for achieving optical coupling with the least number of components.…”

Optical transceiver sub-system package based on SiOB with 8×14Gbps two-way bandwidth

“…This requires large bandwidths on the physical link layer. Protocol standards are evolving to meet higher performance requirements, Optical modules QSFP and CXP for Infiniband applications supporting multi-Gbps per channel have been proposed [3][4][5]. However, optical package is challenging because of combining thermal, electrical and optical design, process and reliability requirements.…”