| 摘要 |
A hub transceiver 200 comprising a laser 230 configured to output an optical carrier signal to a modulator 235 and to an up-link receiver 220 over a polarization maintaining, PM, distribution network 240. The modulator 235 arranged to output a down-link signal comprising the optical carrier signal to a branching unit 215 over a first PM transmission line 241. The branching unit 215 configured to forward the down-link signal from the modulator 235 to an I/O port 210 and also to forward a received up-link signal from the I/O port 210 to an up-link receiver 220 over a second PM transmission line 242. The up-link receiver 220 is arranged to receive up-link data in the up-link signal by means of the optical carrier signal. |
