## 2 Results and Discussion
### Baseband Data Transmission over PFGI-POF at 10 Gbps
**(b)** IsoBER plot measurement performed at 100 m, 200 m and 300 m.  
coupling losses due to the mismatch between the large core PFGI-POF and the photodetector, collimating and focusing lenses inducing 4.8 dB coupling losses have been proposed by [PERSON] _et al._ The study reported by [PERSON] _et al._[18] is performed at 850 nm (wavelength compatible with low cost 10 G XFP transceiver) and without adaptive optics between the tested PFGI-POF and the photodetector. In order to exhibit the power dispersion penalties, the Bit Error Rate (BER) as a function of the received optical power have been measured in: (1) the back-to-back case; and (2) by inserting the required length corresponding to the four fibers being tested (Figure 16). The fiber length is close to 100 m.  
The BER values from the measurements performed on the GigaPOF50-SR PFGI-POF did not provide any good results and a concentricity mismatching between the fiber core and the cladding is suspected. The exhibited power dispersion penalties are summarized for a BER = 10\({}^{-9}\) in Table 3.  
Figure 16: BER measurement as a function of the received optical power: (**a**) Lucina (**b**) GigaPOF62-SR (**c**) GigaPOF62-SR. The main conclusions are summarized in [18]. The GigaPOF62-SR, the GigaPOF120-SR and the Lucina fibers coupled to an EDC device, exhibit power dispersion penalties around 4 dB. These penalties are inherent to the modal bandwidth of the fiber. From the results summarized in Table 3, the potential impact of the EDC technology for the 10 GbE over PFGI-POF is clearly demonstrated. Effectively, the 10 GbE transmission over the GigaPOF62-SR (length: 100 m) has been achieved with a BER value close to \(10^{-12}\). The mask testing measurements reported in Figure 17 corroborate the technological improvement obtained using EDC devices. In fact, using the conventional photoreceiver (RX part of the low cost Picolight XFP) leads to a BER close to \(10^{-7}\). The BER stays around 3 \(\times\)\(10^{-12}\) when the EDC device is activated. The eye opening is then higher with the use of the EDC device. It has been shown that the EDC device enhances the signal quality by reducing the intersymbol interference phenomena which demonstrates without doubt, the potential of this technology. An increase of the transmission length as well as the data rate are reported which clearly demonstrated the enhancement of the PFGI-POF performances. The 40 Gbps transmission over 30 m of the GigaPof-50 SR both at 1,550 nm and 850 nm has already been reported by [22]. An increase of the link length is then realized by the same group and similar transmission over the GigaPOF62-SR PFGI-POF has been demonstrated by [PERSON] _et al._[23]. The link is limited to 100 m and the [PERSON] laser operates at 1,315 nm. In 2007, an interesting comparative study between glass and PFGI-POF has been performed regarding the sensitivity of such fibers to the offset launch, for data rate close to 40 Gbps and link length of less than 100 m [24]. The feasibility of error free transmission at 1,550 nm with either 100 m of glass multimode OM3 Fiber or 50 m of GigaPOF50-SR is therefore performed for a signal having a bit rate close to 40 Gbps. To obtain such results, offset launches close to \(\pm 3\)\(\upmu\)m for the glass multimode fiber and \(\pm 10\)\(\upmu\)m for the PFGI-POF have been employed.