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25GHz带宽光发射机模块

 

The LT-25-M is a 25 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 has a modulation bandwidth of up to 30 GHz. This externally modulated transmitter design provides a high spur-free dynamic range and high input intercept point performances. The LT-25-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 up to 30 GHz

• Highly Linear 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 monitoringg

 

Applications:

• Optical Communication to 30 Gb/s

• Wideband RF Transmission over Fiber

• RF/IF Signal Distribution

• Antenna Remoting

• Optical Delay Lines

• Satellite Communication

 

Model Number

LT-25-M



Optical Specifications




Laser Wavelength Range

1550 nm ± 10 nm, ITU wavelength available



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

50 dB 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

RF Link Gain @ 2 GHz, -24 dB; RF Link Gain @ 20 GHz, -28 dB; RF Link Gain @ 25 GHz, -31 dB



RF Frequency Range

N/A



Gain Flatness

N/A



Carrier Interference Noise Ration (CINR)

N/A



2nd Harmonics Distortion

-70 dBc 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

208 mm x 108 mm x 30 mm



Control/Monitoring

Laser Enable



Display

N/A



Alarm

Local: LED: Optional Input Power

Technical Specifications