| 摘要 |
An influence of noise propagated from a transmitting circuit to a receiving circuit is reduced in an optical transceiver. The optical transceiver includes a transmitter optical subassembly (TOSA), a receiver optical subassembly (ROSA) including a light receiving element, a transmitting circuit for driving a light emitting element in TOSA, a receiving circuit for processing an electric signal from ROSA, and a printed circuit board mounted with the transmitting circuit and the receiving circuit. TOSA and ROSA are connected to the printed circuit board respectively by a first and a second flexible board. The printed circuit board includes a face mounted with the transmitting circuit. The second flexible board is provided with a ground layer at one face thereof and is provided with a signal line at a face on an opposed side. The second flexible board is arranged by directing the ground layer to a side of a face mounted with the transmitting circuit.
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