A Cost-competitive Optical Receiver Engine Based on Embedded Optics Technology for 400G PAM4 Optical Transceivers in Data Center Applications

We propose a novel, tiny optical receiver engine utilizing an all-in-one package based on embedded optics technology. The package’s best transmission S21 and reflection S22 opto-electric (OE) bandwidths are 49.8 GHz and 34.9 GHz, respectively, and the reflectance of the optical engine is below −31.7 dB for all channels. The engine satisfies the MIL-STD-883G standard for reliability tests, such as mechanical and thermal shock, and vibration resistance. The sensitivity after 10 km single-mode fiber (SMF) transmission is below −8 dBm. The optical receiver engine is cost-competitive and applicable for 400G coarse wavelength division multiplexing 4 (CWDM4) 10 km optical transceivers.