What's the main raw materials for optical transceiver?

The main components of the product are optoelectronic devices(TOSA,ROSA,BOSA), shell (optical interface) and PCBA.
  
◆ TOSA(Transmitting Optical Sub-Assembly), with 4 PINS; ROSA(Receiving Optical Sub-Assembly), with 5 PINS; BOSA(Bi-Directional Optical Sub-Assembly), with 9 PINS.

◆ PCBA is a circuit board. Engineers will select the different chip design according to the projects. The common chips are SEMTECH, UXUN, Maxim and Macom.

◆ The optical module shell is generally divided into single and dual fiber. According to the interface type, mainly divided into LC and SC.

Different types of optoelectronic devices, the raw materials are not exactly the same, as follows:
TOSA: TO-CAN, ceramic cores, tube(Metal in general)
Classification of ceramic cores
※ Precision: single mode ceramic core and multimode ceramic core
※ outside diameter: SC(2.5mm) , LC(1.25mm)

Major chip manufacturers: 
Japan: Mitsubishi, Sumitomo
USA: CY（CYoptics）, AOI
Taiwan: LuxNet, Truelight

ROSA: PIN-TIA 、tube(Plastic in general)
PIN-TIA chip manufacturers:
Domestic: Fiberhome, Mignal, Opto Sensor Tech
Abroad: NT(Nanotech), Oclaro, SEMTECH etc.

BOSA: TO-CAN, ceramic cores, tube and filters

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