Market research firm IHS Infonetics latest optical networking market research report, the global optical network market in the third quarter reached $ 2.95 billion, from the previous quarter fell 10% year on year over the same period fell 1.7%. Last quarter of the global optical network market has 21% of the chain growth.

With the Internet, high-speed IP data traffic growth, resulting in demand for transmission bandwidth is increasing. Though DWDM (Dense Wavelength Division Multiplexing) technology as the most effective way to solve the line bandwidth expansion, but CWDM (coarse wavelength division multiplexing) technology over DWDM system has advantages in cost and maintainability.

Optical module vendors Menara network has said its direct detection tunable DWDM 100G CFP optical module has achieved volume sales. Menara also introduced its 100G Wave Master wavelength adjusting and BER tester.

CommScope has introduced broad-based with its SYSTIMAX LazrSPEED 550 multimode fiber WBMMF cable products. This fiber can support four wavelengths 850nm to 950nm transmitted simultaneously, rather than that single wavelength ordinary OM4 fiber. CommScope OFC once during the year, and Finisar exhibited together with the application of short-wavelength WDM optical modules and this fiber. The use of this fiber provides a new option for reducing costs from 40G to 400G optical modules of various types. In addition, this fiber also supports traditional OM4 fiber applications.

Currently, reconfigurable OADM has become the development direction. In addition to using the optical switch dynamically select the upper and lower wavelengths, the use of a tunable filter is a hot spot.

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.

OTN is based on WDM technology, optical transport network layer in an organization's network, it is the next generation of backbone transmission network. OTN is the next generation through a series of ITU-T recommendation G.872, G.709, G.798, etc. norms "digital transmission system" and "optical transmission system" that will solve the traditional WDM networks without wavelength / sub-wavelength services poor scheduling, network capacity is weak, weak protection and other issues.

This article discusses the function of WDM technology OADM based systems, the node structure and its products and applications, and its drop multiplexing tributary signals in wavelengths, called optical channel. OADM node device is one of the key equipment of all-optical network.

WDM (Wavelength Division Multiplexing), Lightwave share with technology, is transmitted simultaneously in a single optical fiber technology multi-wavelength optical signal.