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Chapter 5 Specifications
5.1
Basic Specifications
Item
Wavelength
Optical power
Measurement characteristics
Interface
Warm-up time
*
Typical value represents a typical or average value. It is not strictly warranted.
Note The optical fiber used for testing is SM10/125 PC.
The specifications of the FBG used for testing are as follows: FWHM (Full Width Half Maximum): 0.25 to 0.6
nm, reflection ratio: 85% or more, SMSR (Side Mode Suppression Ratio): 10 dB or more, and flat-top type.
IM 703753-01E
Characteristics
Wavelength
1527 to 1567 nm (FB200C)
measurement range 1568 to 1607 nm (FB200L)
Wavelength
1 pm
display resolution
Relative wavelength ±10 pm or less
deviation
Wavelength
±5 pm or less.
repeatability
Wavelength
±50 pm or less.
accuracy
Measurement
4 ranges
power range
(switched by a command) The value inside the parentheses is for the
(0.1 nm width)
–5 dBm range: Low sensitivity
–15 dBm range: Low sensitivity –15 dBm range: –15 to –45 dBm (–35 dBm)
–25 dBm range: High sensitivity –25 dBm range: –25 to –55 dBm (–45 dBm)
–35 dBm range: High sensitivity –35 dBm range: –35 to –65 dBm (–50 dBm)
Power display
0.01 dBm (minimum)
resolution
Minimum detection –60 dBm or less
power
(–70 dBm typ.)
Maximum optical
±16 dBm (40 mW) or less
power
Number of
About 40
measurable FBGs
FBG spacing
Approx. 1.0 nm
Measurement
10 ms (100 Hz) minimum
interval
Output data
Wavelength and power level
(output as numerical data)
Host I/F connector
FCN-705Q030-AU/M by Fujitsu Components Limited
Interface
Conforms to RS-422.
Alarm
Outputs CPU alarm and other alarms using open collector signal
30 min
Notes
C band model
L band model
Temperature fluctuation
10°C/6 h or less
3σ value under the same
conditions (σ: standard deviation).
3 pm p-p typ. within 10 dB from
the upper limit of each range.*
Recommended power range of each range.
case when averaging is not performed.
–5 dBm range: –5 to –35 dBm (–25 dBm)
0.1 nm width
Total power of all spectra
When FBGs are used at 1 nm
spacing between FWHM and 0.25
nm.
Smaller spacing is possible, but
should be twice FWHM
Selectable range
10 ms to 990 ms (in 10 ms steps),
1 s to 360 s
Example of conditions when
measuring at 10 ms intervals.
Low sensitivity range, the number
of FBGs: up to 16 for 921.6 kbps
The number of FBGs is
approximately 3 for 115.2 kbps.
The center wavelength of the
reflection spectrum of FBG is
output for the wavelength.
The spectrum density calculated at
a slit width of 0.1 nm near the
center of the spectrum is output for
the optical power level.
5
5-1
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