Optical Transceiver

The color of the pull ring of the optical transceiver  is determined by the wavelength. The conventional wavelengths of dual-fiber optical transceiver s are 850nm, 1310nm, and 1550nm. The pull ring of the Gigabit 850nm optical transceiver  is black, the pull ring of the 1310nm optical transceiver  is blue, and the pull ring of the 1550nm optical transceiver  is yellow. The conventional wavelengths of single-fiber optical transceiver s are 1310nm, 1490nm, 1550nm, 1270nm, 1330nm. The colors of the pull rings of 1310nm and 1550nm are the same as those of dual-fiber. 1490nm is purple, 1270nm is blue, and 1330nm is Gearlink.

The SFP+ optical module is a hot-swappable integrated transceiver module that is independent of communication protocols and complies with IEEE 802.3 AE, SFF-8431, and SFF-8432.  SFP+ optical module transceiver like our brocade SFP modules typically transmits light at wavelengths of 850nm, 1310nm, or 1550nm for 10G BPS SONET/SDH, Fibre Channel, Gigabit Ethernet, 10 Gigabit Ethernet, and other applications, including DWDM links.

When the optical module transceiver is working, the transmitting end accesses the electrical signal with a certain code rate, and after being processed by the internal driver chip, the driving semiconductor laser (LD) or light-emitting diode (LED) emits the modulated optical signal with a corresponding rate. After being transmitted through the optical fiber, the receiving end converts the optical signal from the optical detection diode to the electrical signal. And after the preamplifier output corresponding code rate electrical signal.

The application scenarios of optical transceiver s include data centers, mobile communication base stations, passive wavelength division systems, storage systems, backbone networks, and 5G bearer networks. There are many types of optical transceiver s. The commonly used rates are 100M, 1000M, 10G, 25G, 40G, 100G, and 400G. The core network will use 200G and 400G. 400G optical transceiver s have already been put into use.

Measuring the performance index of the optical transceiver  is mainly divided into the sending end and the receiving end. The indicators at the sending end include central wavelength, emitted optical power, and extinction ratio. Different working wavelengths are suitable for different transmission distances. The transmitted optical power is not as strong as possible, nor as weak as possible, there is a certain range. It can be within the range, and the requirements for extinction ratio are different according to different speeds, transmission distances, and laser types. The indicators of the receiving end include receiving sensitivity, receiving optical power and overload optical power. Receiving sensitivity indicates the minimum input optical power that can correctly receive and identify service signals; received optical power indicates the value that enables the receiving end to work normally; overload optical power indicates the maximum input optical power that can correctly receive and identify service signals.

Optical transceiver s have been developing in the direction of high speed, long distance, low power consumption, low cost, miniaturization and hot-swappable. From the previous non-hot-swappable transceiver s to the current hot-swappable transceiver s. From large volume and high power consumption to the current miniaturization, low power consumption, and speed are constantly increasing. Now common packages include SFP, SFP+, SFP28, QSFP+, QSFP28, QSFP-DD and so on.

Now common optical transceiver  classification

Classified by rate: 155M, 1.25G, 10G, 25G, 40G, 100G, 200G, 400G

According to working wavelength: 850nm, 1310nm, 1550nm

Classified by package: SFP, SFP+, SFP28, QSFP+, QSFP28

Classified by mode: single-mode, multi-mode

According to transmission distance: short distance, medium distance, long distance

The above are the more common categories.

You can judge by looking at the wavelength of the optical transceiver . Generally, the optical transceiver  with a wavelength of 850nm is a multimode optical transceiver . All other wavelengths are single-mode optical transceiver s. You can also judge by looking at the color of the pull ring. The pull ring of the multimode optical transceiver  below 40G is black. Except for the black ones, they are all single-mode optical transceiver s. For multimode optical transceiver s of 40G and above, the color of the tab is generally beige. Except for the beige ones, they are all single-mode optical transceiver s. These two are the simplest and can be directly judged by their appearance.

In addition, if the model is marked on the transceiver , SM is single-mode and MM is multi-mode. If there is no model number, the SFP transceiver  can see the color of the pull ring. The international standard black is a multi-mode transceiver , and the others are single-mode. There are many ways to judge.

The dual-fiber optical transceiver  transmits data through 2 fiber cores. Receive and transmit wavelengths are the same. In an optical fiber, only signals in the same direction are transmitted. The single-fiber optical transceiver  has only one optical fiber interface. An optical fiber transmits and receives optical signals in two directions at the same time. Single-fiber optical transceiver s are generally used in pairs.

See the arrow for the dual-fiber optical transceiver . There are sending and receiving signs, or arrows ▼/▲ marked as the direction of entry and exit. The single-fiber transceiver  is an optical fiber to complete the transmission and reception.

They are generic. The optical transceiver s circulating on the market are strictly produced in accordance with industry standards, otherwise they cannot be used normally.

No, the detectors of the receiving transceiver  may not be able to detect.

The function of the optical transceiver  is mainly to do photoelectric conversion. The receiving end converts the optical signal into an electrical signal, and the transmitting end converts the electrical signal into an optical signal. The optical transceiver  is one of the indispensable accessories in the construction of optical network.

The principle of the optical transceiver  is that the receiving end receives the optical signal and converts the optical signal into an electrical signal that can be recognized by IT equipment through some devices, and then the transmitting end converts the electrical signal into an optical signal through a photoelectric conversion device, and transmits it through an optical fiber connection. The principle of the optical transceiver  is very simple, but the components inside are still somewhat complicated.

The color of the pull ring of the optical transceiver  is determined by the wavelength of the optical transceiver . The common wavelengths are 850nm, 1310nm, and 1550nm. In the Gigabit and 10 Gigabit optical transceiver s, the color of the tab at 850nm wavelength is black, the color of the tab at 1310nm wavelength is blue, and the color of the tab at 1550nm wavelength is yellow.

The conventional wavelengths of gigabit dual-fiber optical transceiver s are 1310nm, 1490nm, and 1550nm; the conventional wavelengths of 10-gigabit single-fiber optical transceiver s are 1270nm, 1330nm, 1490nm, and 1550nm; the conventional wavelengths of dual-fiber optical transceiver s are 850nm, 1310nm, and 1550nm. In addition, there are some special wavelengths CWDM, DWDM, LAN WDM and so on. The wavelength of the optical transceiver  also affects the transmission distance.

According to the transmission distance, the optical transceiver s can be divided into short distance, medium distance and long distance. The short-distance transmission optical transceiver  is what we often call a multi-mode optical transceiver . It is transmitted with an OM3 jumper cable. The gigabit multi-mode can transmit 550M, and the 10-gigabit multi-mode can transmit 300M. The working wavelength of the middle-distance transmission optical transceiver  is usually 1310nm, and its transmission distance is between 2km-20km. The long-distance transmission optical transceiver  is more than 20km, and the usual working wavelength is 1550nm.

The transmission rates of common optical transceiver s are 1.25G, 10G, 25G, 40G, 100G, etc. When using optical transceiver s with different rates in different network environments, the rate of the optical transceiver  also needs to match the port of the device. In order to avoid waste of transceiver  resources.

The dual-fiber optical transceiver  is a more commonly used transceiver , with two interfaces connecting two optical fibers. Dual-fiber optical transceiver s include 100M, 1.25G, 10G, 25G, 40G, 100G and other full-series packaging transceiver s. The price of the dual-fiber optical transceiver  is also cheaper than that of the single-fiber optical transceiver , and it is a kind of transceiver  that is used a little more at present.

The single-mode optical transceiver  is our commonly used optical transceiver  with a transmission distance of more than 10KM. It is used with single-mode optical fiber and is suitable for medium and long-distance transmission.

The receiving sensitivity of the optical transceiver  refers to the minimum receiving optical power of the optical transceiver  under a certain rate and bit error rate, and the unit is dBm. In general, the higher the rate, the worse the receiving sensitivity, that is, the greater the minimum received optical power, the higher the requirements for the receiving end components of the optical transceiver . Taking the Gigabit optical transceiver  as an example, the limit value of the receiving sensitivity can reach -30dBm, and the value also represents the quality of the transceiver  to a certain extent.