40Gbit/s CFP optical module is hot-pluggable optical modules clients, including 40Gbit/s BASE-LR4 1310nm CWDM technology-based, single-mode fiber transmission distance up to 10km. Frequency interval based ITU-T G.694.2 specification, use the 1270,1290,1310 and 330nm 4 wavelengths, each wavelength channel rate is 10.3125Gbit/s. 40Gbit/s CFP optical module is a transmission mode in a single-mode optical fiber, to support 40Gbit/s Ethernet data rate transmission over four wavelengths in each wavelength 10.3125Gbit/s, and finally the use of WDM technology to four wavelengths of light composite signal transmitted over one single-mode fiber. 40Gbit/s CFP optical modules are mainly used in MAN, it can be converted into an electrical signal input optical signal output, in order to achieve long distance transmission, but also be able to receive the optical signal into an electrical signal output.

SDH its obvious superiority transmission network has become the mainstream of development. SDH technology and some advanced technology, such as optical wavelength division multiplexing (WDM), ATM technology, Internet technology (Packet over SDH), so that the role of SDH network is growing. SDH has been included in various countries in the 21st century high-speed communications network application project is the development direction of the telecommunications industry recognized digital transmission network, with great commercial prospects.

OTN's intelligent optical network will provide the ideal solution for the transmission of large-granule broadband services. Inter provincial transport network main trunk transport network, provincial trunk transport network, metro (local) transport network structure, while the Metro (local) transport network can be further divided into the core layer, convergence layer and access layer. SDH relative terms, the biggest advantage of OTN technology is to provide scheduling and delivery of large particles of bandwidth, therefore, at different levels whether to adopt OTN network technology, depending on the size of the primary particles dispatch service bandwidth. According to the network situation, primarily particles inter-provincial trunk transmission network, the province trunk transport network and metropolitan area (local) transport network core layer of scheduling is generally Gb / s and above, therefore, these levels can be given priority and scalability advantages OTN technology to build better. For Metro (local) transport network convergence and access layer, when major scheduling particles reach Gb / s order of priority can also be constructed using OTN technology.

SDH / SONET defines a set of rate and format of optical fiber transmission optical signals, generally referred to as the optical synchronous digital transmission network, a broadband one of the foundations integrated digital network of B-ISDN .SDH / SONET uses TDM technology, is a synchronous system, the master clock control, accuracy of 10 ^ -9. both for backbone transport is to follow the application of quasi-synchronous digital series PDH (Plesiochronous Digital Hierarchy) a revolution.

SDH transmission system in the world to have a unified standard for digital transmission rate of the frame structure and standard optical interface, allowing network management system interoperability, and therefore has good lateral compatibility, is fully compatible with existing PDH, and accommodate variety of new traffic signals, the formation of a unified global standard digital transmission system, improve the reliability of the network.

SDH (Synchronous Digital Hierarchy), defined according to ITU-T recommendations, is the transmission of digital signals at different speeds to provide information on the structure of the corresponding level, including the multiplexing method and mapping method, as well as the associated synchronization method consisting of a technical system.

OTN with WDM technology, large transmission capacity on the basis of the introduction of the SDH powerful operation, maintenance, management and assignment (OAM) capabilities, while addressing SDH function at the transport layer for lack of inadequate management and maintenance overhead. Using the embedded standard FEC, extensive maintenance and management overhead for large particles service access FEC error correction coding, improve the BER performance, increased light transmission span.

It should be said OTN and PTN are two completely different technologies, technically speaking we should say no contact.

PTN (Packet Transport Network) refers to an optical transport network architecture and specific technologies: IP traffic between the optical transmission medium and the underlying set a level for which the packet of bursty traffic statistical multiplexing and transmission requirements Designed to packet core business and supports multiple service provider, has a lower total cost of ownership (TCO), while inheriting traditional advantages of optical transmission, including high availability and reliability, efficient bandwidth management mechanisms and traffic engineering, convenient The OAM and network management, scalable, high security.

The main advantage of OTN is fully backward compatible, it can build on existing SONET / SDH management functions on the basis of not only the existence of a fully transparent communication protocol, but also for WDM-end connectivity and networking capabilities, It provides a light layer interconnect specification ROADM, and added sub-wavelength aggregation and grooming.