The target applications include FTTH (GPON/ GEPON/ Point to Point/ 10GEPON), Base Station (3G SFP CPRI/ 6G SFP+ CPRI/ 10G SFP+ CPRI), Fiber channel (4G SFP/ 8G SFP+/ 10G SFP+) and Ethernet systems (from 100Mbps to 40Gbps with different form factor / SFF, SFP, XFP, SFP+, and QSFP+).We report a SDH SFP multi-rate SFP module with a gain selectable transimpedance amplifier (TIA) and a dual-loop APC based on top and bottom level hold.The advantages of 10G Ethernet IEEE 802.3 Ethernet retains the Media Access Control (MAC) protocol, maintaining the same Ethernet frame format. 10G Ethernet has the following characteristics: only works in full duplex mode, increased WAN interface sublayer (WIS), can achieve a seamless connection with the SDH. 10G Ethernet technology is applicable to all kinds of network structure, And Sopto can provide you with the products customized by user.Hope my answer can help you Bookham, Inc., a provider of optical components, modules and subsystems, announced that it will be demonstrating for the first time the capability of its SDH SFP transceiver to transmit at 2.5 Gbit/s and 4.25Gbit/s. The transceiver will provide equipment vendors with the ability to support SONET/SDH, Ethernet and Fiber Channel with one product.The 2.5G SFP transceiver provides a complete 2.5G SONETinterfaces compatible with SDH SFP optical layer and layer. Its microprocessor - based on a modular QSFP-H40G-CU1M – Compatible Cisco 40GbE QSFP+ QDR Direct-Attach Copper Cable 1m design to achieve all of the functions specified in the SFP MSA compatible 2-wire serial digital diagnostic monitoring interface optical transceiver.