“…Recently, a distributed wavelength routing/switching node based on tunable transceivers and AWGR with receiving, transmitting, and routing functions was proposed [6], which consists of transmitters (tunable laser TLD and modulator (MOD), receivers (PD), an electronic controller, and two N×N cyclic-AWG routers for the multiwavelength transmitter and receiver, respectively, as depicted in Fig. 2(a).…”