Biomedical Engineering Reference
In-Depth Information
5-7 V drive voltages
5 GHz bandwidth
Drift free dc bias operation
(c)
Electrode (GND)
I
in
I
out
(V)
Electrode
V
Electrode (GND)
L
dc to 3 GHz
4-11 V drive voltages
(d)
850, 1300, or 1550 nm
FIGURE 5.35 (continued)
(c) (Courtesy of Pilkington Guided Wave Optics & Barr & Stroud, Ltd., Glasgow, U.K.);
(d) (Courtesy of Crystal Technology, A Siemans Company, Palo Alto, CA.)
The manufacturing technology for FBT is quite challenging. FBT devices
are relatively large and require significant packaging design for stable oper-
ation. At best, this technology can support six fiber ports with reasonable
port-to-port uniformity and optical performance. Port counts of higher than
six require fusion splicing and bulky enclosures. FBT devices require dedi-
cated workstations and groups of operators fabricating one fused region at a
time although recent efforts to automate the process show promise. Average
daily yields often do not exceed 70%.
5.12.2 Performance Testing Issues for Splitters
The optical parameters most often tested are the following:
• Split ratio—this is the percent of optical power measured at an out-
put fiber compared with the total output power. This is also mea-
sured as insertion loss in dB. Most splitters are 50/50 equal split.
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