8000A Datasheet, PDF (5/19 Pages) Emcore Corporation – System 8000 Fiber-Optic Interfacility Links

Data Sheet, Rev. 0
March 6, 2003
System 8000 Fiber-Optic Interfacility Links
L-Band Interfacility Link Specifications
The L-band links can carry a downconverted C-, X-, or Ku-band polarization. They can also carry the L-band trans-
mit or receive signals for a satellite mobile communications feederlink station for systems such as Inmarsat. Each
link is designed to meet and exceed all of the requirements for use in Intelsat Standard A and C earth stations even
under the highest signal-loading conditions. The links are especially useful for routing signals to and from a diverse
antenna site. One fiber is used in single-strand links and two are used in 1:1 redundant paths. Optionally, the path
may share a fiber-optic link with another path in 1:2 redundant configurations.
Table 4: L-Band Interfacility Link Specifications: 8710A Tx and 8720A Rx
Parameter
Specification
Symbol Min
Typ
Max
Unit
Passband
—
950
—
2050
MHz
Optical Loss Budget
LOPT
—
>6
—
dB
Nominal RF Input at Max Input Gain
RFIN
—
–30
—
dBm
Link Gain (–6 dB with Redundancy Switching)
G
–10
—
17
dB
Flatness
—
—
±0.2/48
—
dB/MHz
—
±1.0/500
—
dB/MHz
Gain Slope
—
—
0.02
—
dB/MHz
Gain Stability at Constant Temperature
∆GT
—
±0.15/24
—
dB/hr
Noise Figure at Max Input Gain
(Add 4 dB with Redundancy Switching)
NF
—
20
—
dB
Spur-Free Dynamic Range*
SDFR
—
96
—
dB/Hz^2/3
Group Delay:
Peak-to-Peak
Linear
Parabolic
—
—
0.5
—
ns
—
0.02
—
ns/MHz
—
0.01
—
ns/MHz²
Input/Output Impedance
Z
—
50
—
Ω
Input/Output VSWR
—
—
1.5:1
—
—
RF Connector
—
N Jack
—
Optical Fiber
—
1310 nm, Single Mode
—
Optical Connector
—
FC/APC (Tight-fit Keying),
—
Return Loss > 60
dB
Absolute Maximum RF Input (Max Input Gain)
RFIN MAX
—
—
–15
dBm
* Spur-free dynamic range (SFDR) = 2/3(IP3 – NF + 173.8) dB/Hz^2/3; IP3 = input third-order intercept, NF = noise figure. SFDR is the range
where the carrier is above the noise and the third IM is below the noise, C/I = 2x(IP3 – PIN), where PIN = input RF/carrier for two carriers.
Typical L-Band Performance
Table 5. L-Band Interfacility Link Specifications: 8710ATx and 8720A (6 dB Optical Loss Budget)
Parameter Symbol
Input Amp
Fiber-Optic
Link
Output Amp
System
(without RSU)
Min Max
Typ
Gain
G
15
30
–22
Noise Figure
NF
17
8
48
Output TOI
—
28
31
8
Min
Max
Min
Max
0
15
–7
23
13
7
34
19
16
27
3
19
Unit
dB
dB
dBm
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