C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator
description1
Key Features
● Nested Mach-Zehnder Modulators
● X-Cut Lithium Niobate
● Operating at 1525 - 1570 nm
● High Bandwidth operating > 30 GHz
● High Extinction Ratio
● Low Optical Insertion Loss
● Excellent Linearity
Applications
● OFDM Coding
● QPSK Coding
● QAM Coding
● CS-SSB (Carrier Suppressed Single Side Band)
● FMCW LiDAR
Absolute Maximum Ratings
Parameter |
Operating Conditions (1) |
Min |
Max. |
Unit |
Maximum Input Power (Electrical) |
RF portAC coupled |
- |
10 |
Vpk-pk |
Maximum Input Power (Optical) |
CW |
- |
100 |
mW |
DC Voltage at DC port |
- |
-40 |
40 |
V |
Monitor Photodiode Reverse Current |
- |
- |
< 2 |
mA |
Monitor Photodiode Forward Current |
- |
- |
< 10 |
mA |
Monitor Photodiode Reverse Voltage |
- |
- |
< 15 |
V |
Operating Case Temperature |
- |
-5 |
+75 |
°C |
Maximum Top Variation Rate |
- |
- |
5 |
°C/min |
Storage Temperature |
- |
- |
+85 |
°C |
Operating Humidity |
Non-Condensing |
5 |
85 |
% |
Leads Soldering Temperature |
- |
- |
250 |
°C |
Leads Soldering Time |
- |
- |
10 |
s |
Specifications
Characterisitcs |
Operating Conditions (1) |
Min |
Typ. |
Max |
Unit |
Optical |
|
|
|
|
|
Operating Wavelength Range |
- |
1525 |
- |
1570 |
nm |
Insertion Loss, IL² |
EOL, - 5 ~ + 75 ℃ , over C-Band |
- |
5.0 |
7.0 |
dB |
Phase-MZI Optical Extinction Ratio |
Measured @ DC |
24 |
- |
- |
dB |
RF-MZI Optical Extinction Ratio |
Measured @ DC |
24 |
2.9 |
- |
dB |
PER |
- |
20 |
- |
- |
dB |
Optical Return Loss, RL |
Input & Output |
40 |
- |
- |
dB |
Electrical RF Ports |
|
|
|
|
|
RF-MZI Vπ |
@ 1 kHz |
- |
5.0 |
7.0 |
V |
RF-MZO - 3 dB E/O Bandwidth |
wrt. 2 GHz |
20 |
23 |
- |
GHz |
RF-MZI S21 Flatness |
300 MHz - 20 GHz |
-1 |
- |
1 |
dB |
Amplitude difference between |
- |
-1 |
- |
1 |
dB |
RF Delay between RF-MZIs |
- |
-5 |
- |
5 |
ps |
RF-MZI Electrical Return Loss S11 |
40 MHz - 17 GHz |
10 |
12 |
- - |
dB |
Electrical Bias Ports (4) · |
|
|
|
|
|
RF MZI Bias Vπ Voltage |
@ 1 kHz |
- |
7 |
8 |
V |
Phase MZI Bias Vπ Voltage |
@ 1 kHz |
- |
7 |
8 |
V |
RF and Phase MZI Bias Vπ Voltage variation over Wavelength |
C-Band wrt 1550 nm |
-5 |
- |
5 |
% |
Bias port impedance |
@ DC |
1 |
- |
- |
MΩ |
Monitor Photodiode (5) |
|
|
|
|
|
Responsivity (6) |
- |
20 |
- |
120 |
mA/W |
Linearity |
- |
-10 |
- |
10 |
% |
Phase Error (7)(8) |
PD is not inverting |
-5 |
- |
5 |
Degree |
(1) Top = 25 ℃ , BOL, wavelength at 1550 m, unless otherwise specified.
(2) Insertion loss has to be measured at the maximum of the modulator’s transfer function, and exclude connectors
(3) Test set up to be agreed.
(4) Each bias section has two control pins: to ensire EOL bias voltage range, during operation, bias electrode of all MZs should be supplied with differential voltage.
(5) Single PD monitors overall output.
(6) PD responsivity definition (see also picture below)
• Inner MZs set to maximum transmission.
• The voltage is applied to the outer (phase) MZ
• Responsivity: R = (Im_- 3 dB) / (Pout_- 3 dB)
• Im_ - 3 dB is the photodiode current when output optical power is - 3 dB from maximum.
• Pout_- 3 dB is the output optical power at - 3 dB from maxximum.
(7) The PD phase error is the difference (in modulator phase) between the maximum/minimum of the PD output and the maximum/minimum of the modulator optical output.
(8) PD phase error of ±5° correspond to a phase error of ±2.8%.
Pin-Out and Fiber Specifications
RF Connector |
SMPM male |
Bias Ports |
DC pins |
Input Fiber |
Polarization Maintaining Fiber, PMF - Panda (Corning/Fujikura PM15-U25D), 900 µm |
Output Fiber |
loose tube, > 1.5 m |
Minimum Bending Radius of Fiber |
Polarization Maintaining Fiber, PMF - Panda (Corning/Fujikura PM15-U25D), 900 µm loose tube, > 1.5 m |
Mechanical Outline
Pin-Out Information
Pin |
Name/Description |
Note |
1 |
RF. 1 |
RF Input (SMPM male) |
2 |
RF. 2 |
RF Input (SMPM male) |
3 |
BIAS 2+ |
Bias wrt RF.2 +V |
4 |
BIAS 2- |
Bias wrt RF.2 -V |
5 |
BIAS 1+ |
Bias wrt RF.1 +V |
6 |
BIAS 1- |
Bias wrt RF.1 -V |
7 |
Bias PH+ |
Bias Phase +V |
8 |
Bias PH- |
Bias Phase -V |
9 |
PD Cathode |
-ve |
10 |
PD Anode |
+ve |
11 |
GND |
Ground |
Note: The pin# 3&4, 5&6, 7&8 pin pair doesn’t need to be exact as above table, but any pin pair just need to be of opposite voltage.
Electrostatic Discha rge (ESD)
Caution : Use of controls or adjustments or performance of procedures other than those specified herein may result in electrical component failure
RoHS Compliance
GKER is fully committed to environment protection and sustainable development and has set in place a comprehensive program for removing polluting and hazardous substrates from all of its products. This product is RoHS compliant.
Reliability Requirements
This modulator is designed to meet Telcordia GR-468-Core requirements and hermetically sealed.
Ordering Information:
For more information on this product, optional optical connectors and their availability, please contact your local GKER account manager or GKERTdirectly at sales@GKERPhotonics.com
Product Description |
Part Number |
40G QPSK, C-Band 40 GHz QPSK (IQ) LiNbO3 modulator (PM fiber, 900 µm loose tube, > 1.5 m, no connectors) |
792001590 |


