A multi-channel optical transceiver module comprising: a transceiver housing having a transceiver optical connection end and a transceiver electrical connection end, the transceiver optical connection end of the transceiver housing being configured to provide an optical connection and the transceiver electrical connection end of the transceiver housing being configured to provide an electrical connection; a multi-channel transmitter optical subassembly, hereinafter referred to as TOSA, located in the transceiver housing proximate the optical connection end, the TOSA being configured to transmit a wavelength division multiplexed, WDM, optical signal on multiple channel wavelengths; a multi-channel receiver optical subassembly, hereinafter referred to as ROSA, located in the transceiver housing proximate the electrical connection end, the ROSA being configured to receive a wavelength division multiplexed, WDM, optical signal on multiple channel wavelengths; a circuit board located in the transceiver housing and electrically connected to the TOSA and to the ROSA, wherein the ROSA is spaced from the circuit board, and wherein the circuit board includes RF inputs located proximate the transceiver electrical connection end of the transceiver housing and at least a first plurality of integrated circuit, hereinafter referred to as IC, components located between the circuit board and the ROSA, the IC components being electrically connected to the TOSA and the ROSA; the transceiver characterized in that the ROSA includes a ROSA base portion, a demultiplexer mounted on the ROSA base portion, and an array of photodetectors coupled to outputs of the demultiplexer, and in that the ROSA is oriented in the transceiver housing with the ROSA base portion facing away from the circuit board and facing a top portion of the transceiver housing to provide thermal dissipation from the ROSA to the transceiver housing top portion. a transceiver housing having a transceiver optical connection end and a transceiver electrical connection end, the transceiver optical connection end of the transceiver housing being configured to provide an optical connection and the transceiver electrical connection end of the transceiver housing being configured to provide an electrical connection; a multi-channel transmitter optical subassembly, hereinafter referred to as TOSA, located in the transceiver housing proximate the optical connection end, the TOSA being configured to transmit a wavelength division multiplexed, WDM, optical signal on multiple channel wavelengths; a multi-channel receiver optical subassembly, hereinafter referred to as ROSA, located in the transceiver housing proximate the electrical connection end, the ROSA being configured to receive a wavelength division multiplexed, WDM, optical signal on multiple channel wavelengths; a circuit board located in the transceiver housing and electrically connected to the TOSA and to the ROSA, wherein the ROSA is spaced from the circuit board, and wherein the circuit board includes RF inputs located proximate the transceiver electrical connection end of the transceiver housing and at least a first plurality of integrated circuit, hereinafter referred to as IC, components located between the circuit board and the ROSA, the IC components being electrically connected to the TOSA and the ROSA; the transceiver characterized in that the ROSA includes a ROSA base portion, a demultiplexer mounted on the ROSA base portion, and an array of photodetectors coupled to outputs of the demultiplexer, and in that the ROSA is oriented in the transceiver housing with the ROSA base portion facing away from the circuit board and facing a top portion of the transceiver housing to provide thermal dissipation from the ROSA to the transceiver housing top portion.