This paper proposes an integrated optoelectronic chip pair that can simultaneously receive and transmit signals by integrating a vertical cavity surface emitting laser (VCSEL) unit in the vertical direction of a PIN photodetector (PIN-PD) unit. The two units can transmit in two bands at the same time. In particular, one terminal can transmit and receive optical signals at the central wavelengths of 805 and 850 nm, respectively; the other terminal can transmit and receive optical signals at the central wavelengths of 850 and 805 nm, respectively. This study mainly introduces and optimizes the structure and performance of one end of the optical signal transmission at the wavelength of 805 nm and theoretically analyzes the electrical isolation and optical decoupling of the VCSEL and PIN-PD units, which further ensures that the structure can work as a transceiver at the same time.