TOSA Light Emitting Module Assembly-Optical Sub-module
TOSA, an abbreviation of Transmitter Optical Subassembly, Chinese is a light emission sub-module. The main application is to convert electrical signals into optical signals (E/O conversion), and the performance indicators include optical power and threshold.
The optical transmission module is divided into a single-mode optical transmission module and a multi-mode optical transmission module. The overall product architecture includes an optical sub-assembly (OSA) and an electronic sub-assembly (ESA). First, the epitaxial portion is made of gallium arsenide (GaAs), indium phosphide (InP), indium gallium arsenide (InGaAs), etc. as a light-emitting and photo-detecting material, and metal-based vapor deposition (Metal-Organic Chemical Vapor Deposition; MOCVD). ), etc., to make the Lei wafer. In the chip process, the wafer is polished and made into a laser diode. Subsequently, the laser diode, with a filter, a metal cover and other components, is packaged into a TO can (Transmitter Outline can), and then the TO can and the ceramic sleeve are packaged into an optical sub-module (OSA). Finally, the electronic sub-module (ESA) is included, and the electronic sub-module includes two driving ICs for driving and receiving the laser diode and the photodetecting diode, so that the optical transmission module is combined.
The optical sub-module can be further subdivided into a Transmitter Optical Subassembly (TOSA) and a Receiver Optical Subassembly (ROSA).
The main performance indicators of TOSA are optical power value (Po), center wavelength (λc) and so on. The optical power is usually in mW (or uW), for example, Po = 0.5 mW; the unit wavelength of the center wavelength is nm, and the common wavelengths are λc = 850 nm, λc = 1310 nm, λc = 1490 nm, λc = 1550 nm, and the like.
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