1550nm Intensity Modulator（IM15 Series）
1、Product introduction
The intensity modulator based on Mach-Zehnder interference structure can realize the intensity change of interference light wave by modulating the phase of light wave. IM15 series intensity modulators are fabricated with low-loss optical waveguide with single polarization (polarization) characteristics on LiNbO₃ wafer by annealing proton exchange process, so they have excellent polarization stability and can maintain the stability of optical indexes of the device under the condition of high input optical power.
Low-speed intensity modulator adopts high impedance lumped modulation electrode structure, which is suitable for low modulation rate (such as DC~500MHz) application scenarios. The high-speed intensity modulator adopts coplanar traveling wave modulation electrode structure with 50Ω impedance, which is suitable for high modulation rate (such as 1~10GHz).
IM15 series intensity modulators have the remarkable characteristics of low driving voltage, high stability and miniaturization, and can be applied to fiber sensing, fiber communication, microwave fiber link, laser coherent synthesis and other fields.
2、Product series and typical Parameter
（1）IM1500 series [low-speed intensity modulator]
|
Type |
Parameter |
Typical value |
Unit |
|
Optical index |
Crystal tangential direction |
X-cut y-transfer LiNbO₃ |
－ |
|
Waveguide technology |
Proton exchange (single polarization) |
－ |
|
|
operating wavelength |
1550 nm ± 20 |
nm |
|
|
Insertion loss |
5.0 |
dB |
|
|
Polarization extinction ratio of tail fiber |
20 |
dB |
|
|
Switching extinction ratio |
20 |
dB |
|
|
Optical return loss |
-45 |
dB |
|
|
Electrical index |
RF half-wave voltage |
4.0 |
V |
|
Bias half-wave voltage |
5.0 |
V |
|
|
RF operating bandwidth（S21） |
DC~500M |
Hz |
|
|
RF electric reflection（S11） |
－ |
dB |
|
|
RF port impedance |
~1M |
Ω |
|
|
Bias port impedance |
~1M |
Ω |
|
|
RF/Bias electrical port |
SMA |
－ |
|
|
Packaging structure |
Input fiber |
Single mode fiber or PM1550XP polarization maintaining fiber. Fiber length ≥ 1m, 900μm loose tube, FC/APC connector. |
－ |
|
Output fiber |
Single mode fiber or PM1550XP polarization maintaining fiber. Fiber length ≥ 1m, 900μm loose tube, FC/APC connector. |
－ |
|
|
Package casing |
IM03 |
－ |
（2）IM15 Series [High Speed Intensity Modulator]
|
Type |
Parameter |
Typical value |
Unit |
||
|
Optical index |
Crystal tangential direction |
X-cut y-transfer LiNbO₃ |
－ |
||
|
Waveguide technology |
Proton exchange (single polarization) |
－ |
|||
|
operating wavelength |
1550 nm ± 20 |
nm |
|||
|
Insertion loss |
5.0 |
dB |
|||
|
Polarization extinction ratio of tail fiber |
20 |
dB |
|||
|
Switching extinction ratio |
20 |
dB |
|||
|
Optical return loss |
-45 |
dB |
|||
|
Electrical index |
RF operating bandwidth（S21） |
1.0 |
5.0 |
10.0 |
GHz |
|
RF half-wave voltage |
5.0 |
5.5 |
6.5 |
V |
|
|
Bias half-wave voltage |
7.0 |
V |
|||
|
RF electric reflection（S11） |
≤ -10 |
dB |
|||
|
RF port impedance |
50 |
Ω |
|||
|
Bias port impedance |
~1M |
Ω |
|||
|
RF/Bias electrical port |
SMA |
－ |
|||
|
Packaging structure |
Input fiber |
Single mode fiber or PM1550XP polarization maintaining fiber. Fiber length ≥ 1m, 900μm loose tube, FC/APC connector. |
－ |
||
|
Output fiber |
Single mode fiber or PM1550XP polarization maintaining fiber. Fiber length ≥ 1m, 900μm loose tube, FC/APC connector. |
－ |
|||
|
Package casing |
IM03 |
－ |
|||
（3）Extreme operating conditions
|
Parameter |
Typical value |
Unit |
|
Input optical power |
≤ 100 |
mW |
|
Maximum RF power |
≤ 20 |
dBm |
|
operating temperature |
0 ~ +70 |
℃ |
|
storage temperature |
-40 ~ +85 |
℃ |
|
fiber bending radius |
≥ 50 |
mm |
