Products： Products： SFP
SFP---Small Form Factor Pluggable, also named mini-GBIC. The advantage of SFP is hot pluggable, small size, and metal casing.
Products： Products：1×9
PECL input（low speed ） CML input（high speed ） DDM
Laser modulator
Temp compensation electricity circuit
Laser
Monitory input/output
Laser driver and APC Electricity circuit
PON
ONU OLT
ONU is optical net unit, is end user device, OLT is optical line terminal, is bureau unit.
PON Application
PON: Passive Optical Networks APON: ATM PON; BPON: Broadband PON; GPON: Gigabit PON; EPON: Ethernet PON GE-PON: Gigabit Ethernet PON
BIDI SFP
Single LC or SC connector Save fiber TX and RX has two different wavelength (usually 1310/1550 and 1550/1310) Must be pairs(1550Tx/1310Rx& 1310Tx/1550Rx)
Optical telecommunication system
Standard digital optical system
The most simply optical system
Optical Transceivers Survey:
parts: A optical module combined by 3 parts: connector. OSA,electronic device and optical connector. 光发射部分由驱动电路、 控制电路（ APC、 光发射部分由驱动电路 、 控制电路 （ 如 APC 、 光源三部分构成， ATC) 、 光源三部分构成 ， 具有发射禁止和监视输 出等功能。 出等功能。 光接收部分主要由PIN TIA前放组件和主放电 PIN光接收部分主要由 PIN-TIA 前放组件和主放电 路两部分组成，并具有无光告警(LOS)功能。 (LOS)功能 路两部分组成，并具有无光告警(LOS)功能。
Internal structure of transceivers
SFP
XFP
Types of SFP (2)
By optical port. Dual fiber SFP,BIDI SFP, Copper SFP
Dual fiber SFP
Dual LC connector Each fiber need both on TX and RX Most popular.
TOSA (TX optical sub-assembly) subTOSA
Application Data base
155M 622M 1.244G 2.488G 1.0625G
wavelength
850nm 1310nm 1550nm 850nm
Laser
VCSEL FP/DFB VCSEL FP/DFB VCSEL
Receiver
PD Restriction amplifier
PECL buffer
First put
LPF
Data output
Signal electricity circuit
buffer
DDM
Types of Transceiver
By package: 1X9、SFF、GBIC、SFP、SFP+、XFP、 、 、 、 、 、 、 X2、XENPAK、PON…... 、 、
9.953~10.709G
RX OSA
Plastic casing, 9 PIN on the bottom, mainly use on the production of Media converter and VDO multiplexor.
SFF
Small Form Factor , metal casing, 2x5 or 2x10 PIN on the bottom, mainly use on SDH, SONET, fast Ethernet and Fiber Channel.
ROSA Type
ROSA
Application
SDH/SONET
Database
155M 622M 1.244G 2.488G 1.0625G
Wavelength
850nm 1310nm 1550nm 850nm
Chip
Fiber port
PIN
GaAs For 850nm InGaAs For 1310/1550 PIN-TIA For Short Distance APD-TIA For Long Distance LC/SC
GBIC
பைடு நூலகம்
Gigabit Interface Converter, metal casing, mainly use on Gigabit Ethernet switch, hot pluggable.
XFP
10 Gigabit Small Form Factor Pluggable，Metal casing, hot pluggable, applicants in 10G optical telecommunication.
Transmission form of SM and MM fiber
SM Fiber
step Index multimode fiber graded index multimode fiber
Transceiver Principle map
Transmitter
Vcc
Data input
Singlemode Fiber
When Ferrules diameter is between 5~10µm(9/125), the fiber can only allow one method transmission, so SM fiber not has the problem of Chromatic dispersion, it specially use in higher capacity and long distance transmission.
Multimode Fiber
Two standard of Multimode fiber is 62.5/125 µm and 50/125 µm；62.5&50 refers ； to the diameter of ferrules. 125 refers the diameter with coating. Multimode fiber only use on less capacity and short distance transmission.
Classification
by transmission medium Single mode transceiver Multi mode transceiver
Fiber structure
The main contain of fiber is high purity SiO2. And with some other materials with very few quantity, in order to enhance the reflection.
DDM No DDM SFP CAN NOT upgrade to DDM SFP
DDM
DDM information
EEPROM
Optical sub materials
TX side：LED、VCSEL、FP、DFB、 ： 、 、 、 、 CWDM、DWDM,EML.DML 、 RX side：PIN-TIA、APD ： 、
X2
X2, Metal casing, hot pluggable. 10G Ethernet.
XENPAK
X E N PA K : M e t a l c a s i n g , h o t pluggable, 10G Ethernet.
PON
PON--passive optical network. There are EPON and GPON； EPON ； based on IEEE802.3ah，GPON based on IEEE802.3ah ， ITU-TG.984. So far EPON is mature and GPON is still in developing, (GEPON is E P O N )
LC/SC FP/DFB FP/DFB DFB VCSEL FP/DFB
Male/Femal
9.953~10.709G
TX OSA
(VCSEL： Vertical Cavity Surface Emitting Laser):850nm, ： Short Reach (FP ：Fabry-Perot)Laser:1310nm，Intermediate Reach ， (DFB ：Distributed Feedback ) Laser:1310nm and 1550nm,Long Reach