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C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator
Modulator

C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator

GKER 40 GHz QPSK modulator design is based on a dual parallel structure of two Mach-Zehnder modulators (DP-MZM) embedded in a Mach Zehnder Super-Structure. Each internal modulator is  designed to have EO bandwidth above 20 GHz. Monitor photodiode is provided for automatic bias control (ABC).

    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
    RF-MZIs (Difference between S21s)

    -

    -1

    -

    1

    dB

    RF Delay between RF-MZIs

    -

    -5

    -

    5

    ps

    RF-MZI Electrical Return Loss S11

    40 MHz - 17 GHz
    17 GHz - 30 GHz

    10
    8

    12
    10

    -

    -

    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

    -

    -

    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%.

    C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator

    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
    15 mm

    Mechanical Outline

    C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator

    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

    C-Band 40 GHz QPSK (IQ) LiNbO³ Modulator

    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

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