20GHz帶寬光發(fā)射機模塊
The LT-20-M is a 20 GHz bandwidth lightwave transmitter module designed for RF over fiber, antenna remoting and broadband RF transmission applications using single mode optical fiber. This module uses a low noise, narrow linewidth, 1550nm distributed feedback (DFB) laser diode as Continuous Wave (CW) light source. A broadband Lithium Niobate (LiNbO3) optical modulator is employed to provide the linear modulation capability that exceeds 20 GHz in its modulation bandwidth. This externally modulated transmitter design provides a high spur-free dynamic range and high input intercept point performances. The LT-20-M can also be used for digital transmission when driven by a wideband modulator driver.
The DFB laser’s temperature stability is controlled with the use of an internal TEC. The optical modulator is controlled via a high precision bias controller to ensure the operation is set to quadrature. This design enables LT-20-M to provide with the lowest distortion and wide modulation bandwidth. The transmitter provides status monitoring through an RS-232 serial port interface.
Features:
• Useful Bandwidth upto 20 GHz
• Low Distortion for Analog
Transmission
• High Spur-Free Dynamic Range
• Low RIN, Narrow Linewidth DFB Laser
• Broadband LiNbO3 Modulator
• Status Monitoring: RS-232 (standard)
• RS-232 interface for status monitoring
Applications:
• Optical Communication to 20 Gb/s
• Wideband RF Transmission over Fiber
• RF/IF Signal Distribution
• Antenna Remoting
• Optical Delay Lines
• Satellite Communication
|
Technical Specifications |
|
Model Number |
LT-20-M |
|
|
|
|
Optical Specifications |
|
|
|
|
|
Laser Wavelength Range |
1550 nm ±10 nm |
|
|
|
|
Transmission Distance Range |
N/A |
|
|
|
|
Optical Output Power Level |
+4 dBm to +8 dBm |
|
|
|
|
Output Power Stability |
N/A |
|
|
|
|
Laser Launch Power Level |
N/A |
|
|
|
|
Optical Return Loss |
50dB typ/ |
|
|
|
|
Optical Connectors |
SC/APC, FC/APC Optional |
|
|
|
|
Receiver Input Wavelength Range |
N/A |
|
|
|
|
Optical Input Level Range |
N/A |
|
|
|
|
RF/Link Specifications |
N/A |
|
|
|
|
Input RF Power Level |
N/A |
|
|
|
|
RF Output Level |
N/A |
|
|
|
|
Link Gain |
@ 2 GHz; -18 dB , @ 20 GHz -33 dB |
|
|
|
|
RF Frequency Range |
N/A |
|
|
|
|
Gain Flatness |
N/A |
|
|
|
|
Carrier Interference Noise Ration (CINR) |
N/A |
|
|
|
|
2nd Harmonics Distortion |
-7 0dBc typ. |
|
|
|
|
1dB Compression Point |
+20 dBm typ. |
|
|
|
|
Input Impedance |
N/A |
|
|
|
|
Input RF Return Loss |
N/A |
|
|
|
|
RF Connectors |
K Connector Female, 50 Ω |
|
|
|
|
Mechanical Specifications |
|
|
|
|
|
Operation Temperature |
-40°C to +70°C |
|
|
|
|
Storage Temperature |
-55°C to +85°C |
|
|
|
|
Power Supply |
+12 V DC, 2 A max. |
|
|
|
|
Power Consumption |
N/A |
|
|
|
|
Housing Dimensions |
208mm x 108mm x 30mm |
|
|
|
|
Control/Monitoring |
Laser Enable |
|
|
|
|
Display |
N/A |
|
|
|
|
Alarm |
Local: LED: Optional Input Power |
|
|
|
|
|
|
| |
