“…With the rapid growth of data traffic in local area networks, wireless mobile communications, and data centers [1] , high speed, low-cost, and highly compact transceivers have attracted considerable interest in recent years. In order to exploit the data transmission capacity of an optical connection, wavelength-division multiplexing (WDM) and parallel singlemode fiber 4-lane (PSM4) [2] are mainly adopted. In these applications, a multi-lane transmitter optical sub-assembly (TOSA), with integration of lasers, modulators, and WDM filters, can help miniaturize an optical transceiver.…”