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1550nm Direct Modulated AGC Optical Transmitter
Category: Optical Transmitte  Publish Time: 2014-07-07 21:46 

1550nm Direct Modulated AGC Optical Transmitter
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IT8500T ( CNR≥54dB, SBS:13~19 adjustable)
Top-class ITU wavelength adjustable Externally Modulated Optic transmitter

Description
The External modulation technology, with the laser working in direct current, has the advantages of no laser chirp, low dispersion distortion, large extinction ratio, and high speed. It also has the disadvantages of high cost and high difficulty in manufacturing.
Direct modulation will lead to high laser chirp (Laser's bias current is modulated by signal and the optical spectrum shifts and shakes). Laser chip will interact with dispersion effect caused by standard single mode fiber (SMF-28), which will generate serious distortion in the place of 1550nm. This kind of distortion will become more serious with the increase of transmission distance, bandwidth and channel number.
At present, international high performance 1550nm direct modulation has no obvious performance inferior while transmitting an analog and digital multiplexing full channel signal with transmission distance≤15Km or transmitting digital load with transmission distance≤40Km.
Idealphotonics IT1500A is a 1550nm direct modulation optical transmitter with high index and AGC function. It adopts high linearity and low chirp DFB laser, built-in pre-distortion compensation and AGC, APC, ATC closed loop control, which improves the system index obviously. IT1500A direct modulated optical transmitter can be used in FTTx (≤10Km) of second-grade service area (Sub-HE), also can be used in WDM narrow-band multiplexing and IP/QAM.
IT1500AC optical transmitter: CATV wavelength.
IT1500AU optical transmitter: ITU standard wavelength.
Feathure
Low chirp, high linearity DFB laser, chirp compensation.
Dual module RF driver , high efficient laser pre-distortion adjustment.
Full-automatic OMI control, AGC & MGC.
Intuitionistic modulation status display.
Built-in dual back-up power supply, switch automatically .
Casing temperature auto-control, ensure the long life of the laser.
Application
Provide IPTV, VOD value-added service in second-grade service area (Sub-HE).Analog digital mixed transmit <15Km
(common distance ≤ 10km). Pure digital load <40Km.
WDM narrow band multiplex >70Km.
Specifications

Performance

Index

Supplement

Optic feature

Wavelength

(nm)

1548~1563

IT1500AC: CATV wavelength

1530~1563

IT1500AU: ITU standard wavelength

Linewidth

(MHz)

≤1

FWHM(△λ)

Side mode suppression ratio

(dB)

≥45

SMSR

Extinction ratio

(dB)

≥20

XP

Equivalent noise intensity

(dB/Hz)

≤-160

RIN (20~1000MHz)

Output power

(dBm)

6

3, 10 Options

Return loss

(dB)

≥55

 

optical fiber connector

 

FC/APC

Optional SC/APC

RF feature

Work bandwidth

(MHz)

45-862

 

Input level

(dBmV)

20±2

MGC

Flatness

(dB)

≤±0.75

45~862MHz

Return loss

(dB)

>16

 

Input impedance

(Ω)

75

RF/INPUT

RF test

(dB)

0±1

 

Link feature

Transmit channel

 

PAL-D/60CH

NTSC/80CH

CNR

(dB)

≥50

-1dBm receive

CTB

(dB)

≤-63

 

CSO

(dB)

≤-57

 

SBS restrain

(dBm)

≥17

 

General feature

Network management interface

 

RJ45, RS232

Support I.E. & SNMP

Power supply

(V)

90~265city power

-48VDC optional

Power Consume

(W)

≤50

Single power works

Work temp.

(℃)

-5~65

Machine temp. control automatically

Storage temp.

(℃)

-40~85

 

Operating relative humidity

(%)

5~95

 

Size (W)x(D)x(H)

 


19×10×1.75 ( " ) 
483×254×44 ( mm )


 

 

Test condition:
a. 47~550MHz, PAL-D/59CH.
b. -1dBm input receiver
Product sereis

Model

Distance(Km)

Output power(dBm)

CNR(dB)

CTB(dB)

CSO(dB)

SBS(dBm)

IT1503A-05

5

3

50

-63

-57

17

IT1506A-05

6

50

-63

-57

17

IT1510A-05

10

50

-63

-57

17

IT1503A-10

10

3

50

-63

-57

17

IT1506A-10

6

50

-63

-57

17

IT1510A-10

10

50

-63

-57

17

IT1503A-15

15

3

50

-63

-57

17

IT1506A-15

6

50

-63

-57

17

IT1510A-15

10

50

-63

-57

17

Test condition: CNR1: Tx to Rx, 0dBm receiving.
CNR2: 16dBm EDFA  ( NF4.5~5.5dB ) , 65km fiber, 0dBm receiving.
Ordering information

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