ANALYTIC FIBER MODULE IN THE OPTICAL CABLE TRANSMISSION
                     ANALYTIC FIBER MODULE IN THE 
OPTICAL CABLE TRANSMISSION
The Passive Optical Networks - PON are having a great expansion nowadays with the increased demand 
of the business and consumer of the Ethernet bandwidth. The expansion of the network it's miles 
feasible if the full fee of possession is lower than the revenues generated by customers.
In such PON systems, burst-mode optical transceivers are essential components. They are constructed 
through integrating transceiver-circuit, optical device, and module technologies.  The configuration of an
ordinary optical transceiver is based on an optical sub-assembly (OSA). The transmitter and receiver 
modules are known as TOSA and ROSA, respectively. A TOSA contains a semiconductor laser diode (LD), 
even as a ROSA contains a photodiode (PD), optical lens, preamplifier, and passive electrical parts.
They are designed in small form-factor with some integrated optical sub-assemblies which can be 
suitable for high-density network. The major cost components of a transceiver module are the 
transmitter optical sub-assembly (TOSA), which converts an electrical and the receiver optical sub-
assembly (ROSA). However, inside a BiDi (Bi-Directional) transceiver, there is a component with called 
“BOSA” (Bi Directional Optical Sub-Assemblies) which acts the role of TOSA and ROSA but with different 
principle.
They are designed in small form-factor with a few included optical sub-assemblies which may be suitable
for high-density network. The major value additives of a transceiver module are the transmitter optical 
sub-assembly (TOSA), which converts an electrical and the receiver optical sub-assembly (ROSA). 
However, internal a BiDi (Bi-Directional) transceiver, there is a part with called “BOSA” (Bi Directional 
Optical Sub-Assemblies) which acts the position of TOSA and ROSA but with different principle.
In a PON system, one optical fiber is used for bidirectional transmission to lessen the network price by 
the use of optical wavelength department multiplexing (WDM). For bidirectional transmission, a WDM 
clear out out is used: it we could transmitted optical signals pass via and displays received optical signals.
The optical bidirectional (BIDI) module consists of a TOSA, a ROSA, and a WDM clear out out it we could 
transmitted optical signals pass via and displays acquired optical signals.