With the drastic expansion of internet usage, the demand of 10Gb/s transmission optoelectronic devices for local-area-network (LAN) and storage-area-network (SAN) are increasing. The key issues of these applications are to improve cost, manufacturability and reliability of optoelectronic devices in high speed transmission. The authors have demonstrated extremely low cost, high manufacturability and thermal stability optical fron-end for 10Gb/s Ethernet applications in this paper. High performance and high sensitivity of 10Gb/s transmitter optical sub-assembly (TOSA) and receiver optical sub-assembly (ROSA) with TO-Can packages are discussed and demonstrated to overcome the critical points in high speed applications, respectively. Moreover, 10km interconnection of 10Gb/s optical front-end without isolated elements inside are also proved to be error free at 10.3125Gb/s. In order to improve the signal integrity and manufacturability of 10Gb/s OSA in small form factor transceiver modules assembly, the authors also integrate high speed flex board and OSA package to extend the signal path, and to minimize the effect of crosstalk in modules. Furthermore, the integration of flex board and OSA package more release the difficulties in conjuunction OSA and electrical sub-assembly (ESA) in module to fulfill the request of 10Gb/s transeivers' Multi-Source Agreement (MSA). The performance of temperature stabilized TOSA over wide case temperature range is also experimented. The optical eye diagram of 10Gb/s TOSA developed in this study showing excellent eye quality passing 10Gb/s Ethernet mask test between 0°C to 85°C.
In this paper, manufacturing issues include Optical Sub-Assembly (OSA), Electrical Sub-Assembly (ESA) and reliability considerations of 10 Gb/s Ethernet transponder were studied by using experiments and implementation. In the growing optical communication industry, one of the star products is the Z-axis pluggable optical transceiver module. Under the broad usage of Ethernet means high port density, low cost, high utilities, compact size and still require excellent performance. After standardizing of 10 Gb/s ethernet (IEEE 802.3ae), many transceiver companies, silicon vendors and system vendors reached the agreement and signed up diversity of MSA (Multi-Source Agreement). These MSAs still keep modifying with system demands, customer requirements, cost and performance issue. This paper presents how to achieve these functions description in the MSA and own a highly manufacturability and reliability module design. According to composed block of transponder, we split it into OSA, ESA, mechanical design and related reliability experimental result. In the OSA, traditional TO-CAN package and optical components be introduced. Because the mature manufacture experience, vendor can easy to meet low cost and manufacturability requirements and only need to slightly modifications. A simply solution be implemented to solve this problem and discuss the critical point of the design. Thermal issue on OSA will also be mentioned because of the sensitive of light source and how to calculate the effect to find effective solutions. By the way, some manufacturability criteria will be discussed for OSA characteristics in 10 Gb/s applications. In the ESA, PMD (Physical media dependant) driving methods, Multi-Source Agreement related digital optical monitor function implement and performance comparison will be presented. On the other hand, we will examine the crosstalk effect between transmitter and receiver circuit and impact to the module Optical to Electrical convert interface design. We still need to take well-assembly between OSA and ESA into consideration. Perfect assembly will lead us to earn wonderful reliability and manufacturability. In the mechanical design, many reliability and maufacturability issue need to consider such as thermal, EMI, temperature, humidity effect etc. So, module mechanical design must be highly collocation with ESA, OSA, heat spreader and special EMI shielding design. Experimental data and thermal simulation result are also prepared to guide us forward to a successful product.