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inserted between them to suppress spontaneous emission light [5, 6]. A stable tilt splice of 25° with a loss of less than 0.2dB was attained between the PDF and the high-NA silica fibre by using the V -groove connection technique. Reflectivity of less than -60dB was achieved using the tilted V -groove connection. The signal source was a DFB laser operating at 1302nm and its output power was 6.5dBm. 40ch carriers ranging from 91.25 to 403.25MHz directly modulated the DFB · laser with a modulation depth of 5.6%/ch. The DFB laser output was amplified by the PDFA and attenuated with a variable optical attenuator. CNR and distortion characteristics were measured for three carrier frequencies, 91.25, 211.25, and 403.25 MHz. Fig. 3 shows the CNR at 403.25MHz as a function of loss budget with and without a PDFA.The CNR was the same in the measured three channels. The loss budget improvement for 52dB CNR was IOdB. The NF was 9.8dB as estimated from the CNR degradation. We believe that the NF improvement from previous reports is due to selecting low loss PDF and that further NF improvement can be expected by suppressing PDF scattering.

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