The introduction of the
100G PSM4 standard is mainly to reduce the cost of optical modules for expensive 100GBASE-LR4 applications. 100G PSM4 optical modules are single-mode parallel four-channel optical modules, which are mainly suitable for 500-meter applications. The 100G CWDM4 standard is mainly formulated for the deployment of 2km 100G links in data centers. The interface of the 100G CWDM4 optical module conforms to the duplex single-mode 2km 100G optical interface specification, and the transmission distance can reach 2km.
100G is listed because it is used more in data center interconnects. There is also a type of optical module, which is also relatively hot recently. That is the 5G fronthaul optical module. One of the most important ones is the
25G Bidi single-fiber bidirectional optical module. Let‘s introduce the technical solutions in detail. The single-acquisition light-emitting module The single-acquisition light-emitting module adopts TOSA or ROSA components to realize the sending or receiving function. Such optical modules only have the function of receiving or transmitting.
Optical Transceiver
The integrated optical transceiver module is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic devices include two parts: transmitting and receiving. The integrated optical transceiver module is the core device of optical communication, which completes the optical-electrical/electrical-optical conversion of optical signals. It consists of two parts: the receiving part and the transmitting part. The receiving part realizes the photo-electric conversion, and the transmitting part realizes the electric-optic conversion. Transmitting part: The input electrical signal with a certain code rate is processed by the internal driver chip to drive the semiconductor laser (LD) or light emitting diode (LED) to emit a modulated optical signal of the corresponding rate, with an automatic optical power control circuit (APC) inside. , to keep the output optical signal power stable. Receiving part: The optical signal of a certain code rate is input into the module and converted into an electrical signal by the photodetection diode, and the electrical signal of the corresponding code rate is output after the preamplifier, and the output signal is generally PECL level. At the same time, when the input optical power is less than a certain value, an alarm signal will be output.
What is a dual fiber bidirectional optical module? Our conventional transceiver integrated module is a dual-fiber bidirectional optical module, that is, there are two optical fiber jacks to achieve simultaneous transmission of optical signals in both directions, that is, the optical module has two ports, TX is the transmitting port, RX is the receiving port. ; Optical fiber transmission is single-fiber unidirectional, so two optical fibers are required to achieve bidirectional communication.
What is a single fiber bidirectional optical module? BiDi optical modules are compact in structure and are mainly used in the field of optical communication, including telecommunication and bidirectional data communication. Single-fiber bidirectional or BiDi, refers to the simultaneous transmission and reception of optical signals in two directions in one optical fiber, just like the front and back lanes separated by isolation belts on the road, and the vehicles on both sides are in their respective lanes. Drive without interfering with each other.
