Novel techniques for high-capacity 60-GHz fiber-radio transmission systems

Performance Improvement and Cost Reduction Techniques for Radio Over Fiber Communications

“…As shown in Fig. 71(b), a low level of transmittance corresponds to a high level of absorption, i.e a high level of photo-detection of the optical input signal by the EAM [112]. On the other hand, a high-level of transmittance would enable the modulation of the input optical signal by the electronic signal applied to the EAM.…”

“…71(b) that the optical input signal is largely absorbed, i.e. it is photo-detected, when a high reverse bias voltage is employed [112]. Thus, the EAM can be operated both as a modulator and a photo-detector by appropriately switching the 1 A single device that is capable of photo-detecting the DL optical signal as well as modulating it with the electronic UL signal.…”

“…73, 1997 Noel et al [112] at the cost of a downlink (DL) versus uplink (UL) performance trade-off. 1997 Wake et al [113] 1999 Stohr et al [114] A pair of lasers were used at the Base Station (BS) along with a modulator-cum-photodetector 2000 Kitayama et al [11] at the Radio Access Point (RAP), as shown in Fig.…”

A 2.4-GHz Wireless-Over-Fibre System Using Photonic Active Integrated Antennas (PhAIAs) and Lossless Matching Circuits

“…These Distributed Antenna Systems (DASs) often employ high specification lasers and RF amplification in order to achieve good link gain and large RF ranges from remote antenna to the user. However, there are opportunities for very low cost modules with reduced RF ranges giving room-scale coverage of 5-10 m [7], [8]. In [8] a range of 5 m was shown with a carrier frequency of 60 GHz using an electroabsorption modulator (EAM) based scheme which requires no laser at the remote end of the link.…”

“…However, there are opportunities for very low cost modules with reduced RF ranges giving room-scale coverage of 5-10 m [7], [8]. In [8] a range of 5 m was shown with a carrier frequency of 60 GHz using an electroabsorption modulator (EAM) based scheme which requires no laser at the remote end of the link. However, EAMs are not low cost and can suffer from low responsivity and be polarization sensitive.…”