Laser Diode, LD Module, Photo Diode, PD Module, Photo Receiver, Photo Receiver Module, Light Emitting Diode, LED Module, Avalanche Photo Diode, APD Module, Optical Transceiver, Optical Transmitter, Optical Receiver, Fiber Bragg Gratting, Array Wave Guide, Erbium-Doped Fiber Amplifier, Epitaxy Wafer, Wavelength-Division Multiplexer, Semiconductor Optical Amplifier and Photonic Integrated Circuits