It can be seen that a DAS mainly consists of several antenna units, passive optical splitters
, and an optical line terminal.
Caption: FIGURE 3: Impact of pump power: (a) fiber to fiber, (b) after 20 km fiber link, and (c) after 20 km + optical splitter
Sr # Modulation ADC bandwidth ADC sampling rate ([T.sub.s]/2) (1) 4-PSK (4 Gbaud) 4 GHz 8 GS/s (2) 8-PSK (4 Gbaud) 4 GHz 8 GS/s (3) 8-PSK (2.66 Gbaud) 2.66 GHz 5.33 GS/s Table 3: Summary of the average attenuation (dB) associated with the standard passive optical splitters
. Sr # Split ratio Average loss (dB) (1) 1 x 2 3 dB (2) 1 x 4 7.5 dB (3) 1 x 8 11 dB (4) 1 x 16 14.2 dB (5) 1 x 32 17.8 dB (6) 1 x 64 21.1 dB (7) 1 x 128 23.8 dB
On the reverse or downstream path, data from the Internet will be returned to the source WB via the FF, optical splitter
, DF, ONU, and GW.
Figure 2 shows the proposed structure of the OLT, which comprises an unpolarized broadband light source (BLS), a ([k.sup.2] - k) optical splitter
, ([k.sup.2] - k) 1 x 2 optical switches with controlled value [b.sub.i], i = 0,1, ..., ([k.sup.2] - k) -1,2 * ([k.sup.2] - k) optical circulators, 2 * ([k.sup.2] - k) fiber Bragg gratings, ([k.sup.2] - k) 2 x 1 optical switches with controlled value [b.sub.i], i = 0, 1, ..., ([k.sup.2] - k) - 1, and a ([k.sup.2] - k) x 1 optical combiner.
Multi-Ratio Optical Splitter
Based on Planar Waveguide.
Asam, "An asymmetric optical splitter
and its application to optical monitoring devices," LEOS 14th Ann.
ADC's patent technology relates to fibre distribution hubs and optical splitter
modules that are widely deployed in an FTTX environment.
Superior design and mass-processing technologies ensuring high quality for PLC chips, such as optical splitter
and arrayed-waveguide grating.
Picosecond Pulse Labs exhibited the Model 8020 optical splitter
for its line of pattern generators.