Optical modules are optoelectronic devices that perform photoelectric and electro-optical conversion. The transmitting end of the optical module converts the electrical signal into an optical signal, and the receiving end converts the optical signal into an electrical signal. Optical modules are classified according to the package form, and the common ones are SFP, SFP+, SFF, Gigabit Ethernet Interface Converter (GBIC), etc. So, how are optical modules classified? What are the applications and functions of optical modules?
Classification and function of optical modules
1.According to function
Including optical receiving module, optical transmitting module, optical transceiver integrated module and optical forwarding module, etc.
The main function of the integrated optical transceiver module is to realize photoelectric/electro-optical conversion, including optical power control, modulation transmission, signal detection, IV conversion, and limiting amplification, decision regeneration, and anti-counterfeiting information query, TX-disable and other functions. Common There are: SFP, SFF, SFP+, GBIC, XFP, 1×9, etc.
In addition to the photoelectric conversion function, the optical repeater module also integrates many signal processing functions, such as: MUX/DEMUX, CDR, function control, performance energy collection and monitoring functions. Common optical transponder modules are: 200/300pin, XENPAK, and X2/XPAK, etc.
Optical transceiver module, English name transceiver, referred to as optical module or optical fiber module, is an important device in the optical fiber communication system.
2.According to the parameters
Pluggability: hot-plug and non-hot-plug
Package form: SFP, GBIC, XFP, Xenpak, X2, 1X9, SFF, 200/3000pin, XPAK.
Transmission rate: The transmission rate refers to the number of transmitted bits per second, in Mb/s or Gb/s. Optical module products cover the following main rates: low rate, 100M, gigabit, 2.5G, 4.25G, 4.9G, 6G, 8G, 10G and 40G.
3.According to the package
①.XFP (10 Gigabit Small Form Factor Pluggable) is a hot-swappable, communication protocol independent optical transceiver for 10G bps Ethernet, SONET/SDH, Fibre Channel.
②. Small pluggable transceiver module (SFP), currently the most widely used.
③.GigacBiDi series single-fiber bidirectional optical modules use WDM technology to realize bidirectional information signal transmission over a single fiber (point-to-point transmission. Especially when fiber resources are insufficient, one fiber is required to transmit bidirectional signals). GigacBiDi includes SFP single-fiber bidirectional (BiDi), GBIC single-fiber bidirectional (BiDi), SFP+ single-fiber bidirectional (BiDi), XFP single-fiber bidirectional (BiDi), SFF single-fiber bidirectional (BiDi) and so on.
④. RJ45 electrical port small pluggable module, also known as electrical module or electrical port module.
⑤.SFF is divided into 2×5, 2×10 and so on according to its pins.
⑥.Gigabit Ethernet Interface Converter (GBIC) module.
⑦.Passive optical network PON (A-PON, G-PON, GE-PON) optical module.
⑧.40Gbs high-speed optical module.
⑨.SDH transmission module (OC3, OC12, OC48).
⑩.Storage modules, such as 4G, 8G, etc.
Second, the application of optical modules:
The full English name of D/T is: datacom/telcom. Data communication mainly includes computer video, data communication, etc. Telcom mainly includes wireless voice communication.
Such products are mostly used in the backbone network of fiber optic networks.
PON: English: passive optical network namely: passive optical network. Such products are mainly used in access networks in optical fiber network systems. Among them, the triplex products can not only transmit optical signals, but also output analog signals.
Optical modules are mainly divided into: GBIC, SFP, SFP+, XFP, SFF, CFP, etc. Optical interface types include SC and LC. However, SFP, SFP+, and XFP are commonly used now, not GBIC. The reason is that GBICs are bulky and easily broken. And now commonly used SFP is small and cheap.
Type: single-mode optical module is suitable for long-distance transmission; multi-mode optical module is suitable for short-distance transmission.
Function: Optical modules are used as carriers for transmission between switches and devices, which are more efficient and safer than transceivers.