19 Octobre 2015
Optical Module is Composed of optoelectronic devices, functional circuits and optical interface. While optoelectronic transmission and reception devices contenir two parts.
To be simply, the optical function of the module is the photoelectric conversion. The end transmitting converts the electrical signal into optical signal, and after-optical fiber's transmission, the end receiving send will convert optical signal into electrical signal.
Construction
In transmission part, after a certain rate of signals are inputted, and processed by the internal driver chip then the Semiconductor Laser (LD) or a Light Emitting Diode (LED) will emit corresponding rate of modulated optical signals. Its interior automatic optical power control circuit makes sure that the outputing optical signals remain stable. While in reception part, after a certain rate of signals are inputed these signals will be converted into optical signals by light detecting diode modules. After processed by the preamplifier it will emit corresponding rate electrical signals.
Classification
The main function of integrated optical transceiver unit is to accomplish achieve the goal of optical / electro-optical conversion, in addition to optical power controlling, transmission modulating, signal Detecting, IV converting, and limiting amplifier decision regenerating, optical modules also have the functions of anti-counterfeiting information inquiry and TX-disable. SFP, SFF, SFP +, GBIC, XFP, 1x9ect are the common type optical module.
Besides photoelectric conversion function, optical transceiver modules also capable of processing signals. Such as MUX / DEMUX, CDR, function controlling, collecting energy and performance monitoring functions. 200 / 300pin, XENPAK, and X2 / XPAK are the familiar optical transponder modules.
Transmission rate Refers to the number of bits per second transmitted, its unit is Mb / s or Gb / s. Optical modules covers the following main rate: low rates, 100M, 1000M, 2.5G, 4.25g, 4.9g, 6G, 8G, 10G and 40G.
Classification by Packaging Format
1. XFP (10 Gigabit Small Form Factor Pluggable) is a hot-swappable, protocol -independent optical transceiver for 10G bps Ethernet, SONET / SDH, optical fiber channel.
2. SFP: small form factor pluggable optical transceiver module is qui The Most common optical unit type.
3. GigacBiDi series single-fiber optical module makes use of WDM technology to point bidirectional signal transmitted with a single optical fiber. (Point to point transmission. Especially when It comes to shortage of optical fiber resources, thus it is needed to transmitted signals with two-way single optical fiber.) GigacBiDi includes SFP single fiber bi-directional (BiDi) GBIC single fiber bi directional (BiDi) SFP + single fiber bi-directional (BiDi) XFP single fiber bi-directional (BiDi) SFF Single Fiber Bi-directional (BiDi) and so on.
4. Port RJ45 electrical pluggable small form factor module also known as electrical unit or electrical interface.
5. According to its pin, SFF can be divided into 2x5，2x10, etc.
6. Gigabit Ethernet Interface Converter (GBIC) module.
7. PON Passive Optical Network (A-PON, G-PON, GE-PON) optical module.
8. 40Gbs high-speed optical module.
9. SDH transmission module. (OC3, OC12, OC48)
10. Memory modules, Such As 4G, 8G, etc.
Common Optical Module
Application
Optical modules, mostly divided into GBIC, SFP, SFP +, XFP, SFF, CFP, etc. Optical interface types include SC and LC and so on. Aim at the now Commonly used are SFP, SFP + and XFP INSTEAD of GBIC. The Reason Is That GBIC is bulky, and Easily Broken, while SFP is small and cheap, so it is more Widely used. Single-mode Optical Module is suitable for long distance transmission, while multi-mode optical unit is suitable for short-distance transmission.
/http%3A%2F%2Fwww.fiber-optic-equipment.com%2Fwp-content%2Fuploads%2F2016%2F03%2FOptical-Fiber-Types.jpg)
/https%3A%2F%2Fassets.over-blog.com%2Ft%2Fcedistic%2Fcamera.png)