This part is a kind of semiconductor called 1751A.

Function of this product has 1550nm DWDM DFB Laser Module.

Manufacturers : EMCORE

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Some of the text within the PDF file :

1751A 1550 nm DWDM DFB Laser Module DATASHEET | JUNE 2012 FIBER OPTICS Applications Node Capability Narrow Transmitter Housing Neworks with Limited Fiber Architectures Using Separate Optical Wavelengths to Carry Targeted Services The 1751 laser module is a Dense Wavelength-Division Multiplexing (DWDM) laser for analog applications. It features a distributed feedback chip that has been designed specifically for Radio Frequency (RF) applications. The 1751 laser module has a wide temperature range for reliable performance in harsh node environments and narrow transmitter designs. It also features low adiabatic chirp to maximize signal quality in short and long lengths of fiber. The laser’s excellent inherent linearity minimizes degradation of the broadcast signals caused by quadrature amp [ ... ]

1751A PDF Datasheet Download