An optical transceiver for fibre optic communication is disclosed, which includes a bi-directional optical sub-assembly (BOSA) 101, a first circuit board 306 and a second circuit board 302. The BOSA includes a laser 103, a photodiode 104, photodiode connectors (110/111 Fig. 2) on a first side of the BOSA and laser connectors (109, Fig. 2) on a second side of the BOSA. The first side of the BOSA (the bottom in Figure 3) is mounted on a first circuit board 306. The first circuit board includes laser driver circuitry (107, Fig. 1)/303, amplifier circuitry (108 Fig. 1)/303 and a receive path 307 which connects the amplifier circuitry with the BOSA’s photodiode connectors. A second side of the BOSA is mounted on a second circuit board 302. The second circuit board is mounted on the first circuit board. The second circuit board includes circuitry 304 for providing impedance matching or modification between the laser driver and the laser. An electrical path 310 couples the impedance matching circuit with the first circuit board 306. The first and second circuit boards may be rigid and orthogonal.
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