5

ORTEL a Division of EMCORE

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.

* Spur-free dynamic range (SFDR) = 2/3(IP3 – NF + 173.8) dB/Hz

Typical L-Band Performance

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

—>6

—

dB

Nominal RF Input at Max Input Gain

—–30

—

dBm

Link Gain (–6 dB with Redundancy Switching)

G

–10

—

17

dB

Flatness

—

—

—

±0.2/48

±1.0/500

—

—

dB/MHz

dB/MHz

Gain Slope

—

—

0.02

—

dB/MHz

Gain Stability at Constant Temperature

—

±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

—

Group Delay:

Peak-to-Peak

Linear

Parabolic

—

—

—

—

0.5

0.02

0.01

—

—

—

ns

ns/MHz

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)

——

–15

dBm

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)

Unit

Min

Max

Typ

Min

Max

Min

Max

Gain

G

15

30

–22

0

15

–7

23

dB

Noise Figure

NF

17

8

48

13

7

34

19

dB

Output TOI

—

28

31

8

16

27

3

19

dBm