Optical communication is the communication with light wave as the carrier. There are two ways to increase the optical bandwidth: one is to increase the single-channel transmission rate of the optical fiber; The second is to increase the number of wavelengths transmitted in a single fiber, that is, wavelength division multiplexing technology (WDM).

At present, broadbａnd metropolitan area network (BMAN) is becoming a hot spot of information construction, DWDM (Dense wavelength division multiplexing) huge bandwidth and transmission data transparency, is undoubtedly the preferred technology in today’s optical fiber application field. However, MAN has the characteristics of short transmission distance, flexible topology and multiple access types. For example, copying DWDM, which is mainly used for long-distance transmission, will inevitably cost too much. At the same time, early DWDM is also difficult to adapt to flexible diversity such as MAN. Faced with the need for broadbａnd in this low-cost metropolitan area, CWDM (coarse wavelength division multiplexing) technology came into being and quickly became a practical device. For optical communication, its technology is basically mature, and the business demａnd is relatively insufficient. Taking FTTH, known as the “ultimate goal of broadbａnd access” as an example, its implementation technology EPON has been fully mature, but due to the low bandwidth required by ordinary users to access the Internet, the commercial use of FTTH is limited to some pilot areas. However, in 2006, with the development of triple play services such as IPTV, the bandwidth provided by operators could not meet the requirements of users for high-definition TV, and the deployment of FTTH was also put on the agenda. Coincidentally, ASON has flexible control over the transmission network and can provide personalized services for enterprise customers. Many operators have invested heavily in the construction of ASON in order to develop and maintain enterprise customers.

The ultimate goal of the future transmission network is to build an all-optical network, that is, to fully realize “optical fiber transmission instead of copper wire transmission” in the access network, metropolitan area network and backbone network. All the current research and development progress is the process of “approaching” this goal.

What are the optical communication devices

Mainly include: optical end (including transmitting, receiving equipment, or transceiver integrated equipment), optical amplifier, codec, optical multiplexer, optical demultiplexer, network management, etc.

For example, the device class has optical junction box, ODF, jumper, optical terminal machine, optical detector, light source, optical power meter, optical attenuator, optical coupler, optical welding machine, optical connection equipment and so on

Equipment category of ZTE, Huawei, Lucent optical transmission equipment. For example, ZTE’s S320, 380/390 series, Huawei’s OpTIX series