High stability electro - optical modulator

1、 product description

    High stability electro-optical modulator is a highly integrated product That integrates electro-optical intensity modulator, bias point automatic control board, microwave amplifier, and driving circuit, switching power supply, and others into one part. This product has low insertion loss, high working bandwidth, low half Wave voltage, stable output signal, not affected by the external environment and other characteristics, the meanwhile electro-optical modulator can work on the QUAN +/-, NULL and PEAK point long-term stably for long-term, so it is widely used in high-speed optical transmission equipment, microwave photon links, phased array and other fields. And the product design for the desktop standard 1U chassis, being used in factories, laboratories, research institutes, and other applications, and what can customize the outlook to meet the needs of different applications.

2、schematic block diagram

High stability electro-optical modulator is composed of the light source module, electro-optical intensity modulator, microwave amplifier and drive circuit, and bias control board composition. The block diagram is shown in figure 1.

3、technical indicator

3.1 optical parameter

① operating wavelength ： 1550nm（ 850nm、1064nm）

② insertion loss： 3～5dB

③ optical fiber type ： PMF/SMF

④ optical interface： FC/PC、FC/APC

3.2 optical parameter

① -3dBbandwidth ： 10GHz（2.5GHz、20GHz、40GHz）

② cut-off frequency： 75KHz

③ electrical return loss ： -12～-10dB

④  input impedance ： 50Ω

⑤ input signal amplitude ： 100～500mV

⑥ the range of adjustable gain： 0～24dB

⑦ adjustment accuracy： 0.5dB

⑧ bias voltage adjustment range ： -7～7V

⑨ adjustable accuracy： 0.1V

⑩ power interface ： SMA(f)（K(f)、V(f)）

3.3 light source (optional )

① laser wavelength ： 1550nm（850nm、1064nm）

② output optical power ： 10-20dBm

③ 3dBspectral width ： 2MHz

④ power stability ： ±0.005dB/5min ±0.01dB/8h

3.4 power availability

AC power ：AC220V/50Hz

3.5 environmental availability

Operating temperature ：-40℃～55℃

Storage temperature ：-40℃～70℃

4、instructions

4.1 interface and chassis panel configuration

he front panel interface and display definition are shown in table 1

Table 1 interface and display instruction

Name	Form	Definition
Switch	Self-locking switch with light	Instrument mater switch
RF input	SMA(F)	RF signal input
Light input	FC/APC	Light source  input side
Light output	FC/APC	Light source output side
Linear area	Switch	-
Extreme point	Switch	-
＋	Switch	-
－	Switch	-
Gain p	Switch	Adjust gain
Gainq	Switch	Adjust gain
Display	1602C	Display RF amplified signal

※remark :the lowest point is null point

5、mechanical structure

dimensions ：484mm×300mm×45mm（tolerance：±1.5mm）

dimensional drawings are shown in figure 3

Figure 3 high-stability electro-optical modulator size chart

六、performance indicator

七、product information

Name: high stability electro-photonic modulator

1.test conditions room temperature 25±2°C；

 2. relative humidity 45%。

Test data

Name	Symbol	Unit	Technical indicator	Measured value
Insertion loss	IL	dB	<5	3.8
-3dB bandwidth	S21	GHz	10	11.2
Light return loss	ORL	dB	-40	-40
Electrical return loss	S11	dB	-12	-12.5
RF gain	G	dB	24	24

General parameter

Name	Symbol	Unit	Value
Operating wavelength	l	nm	1520-1560
RF input impedance		Ω	50
Input signal amplitude		mv
Input optical fiber			PMF
Output optical fiber			SMF-28
Input optical fiber interface			Slow axis alignment
Output optical fiber interface			FC/APC
RF interface			SMA(F)

limit parameter