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EOMs Operating Manual

Ref. Ed. 0

–

08/02/2021

21

3.3.2

V



RF

MEASUREMENT SET UP

(RF

ELECTRICAL PORT

)

3.3.2.1

Intensity Modulator

Fig. 32

3.3.2.2

Phase Modulator

Fig. 33

Note: Reference Phase EOM & DUT must have similar insertion losses to recreate a balanced MZ
interferometer.

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Summary of Contents for EOM

Page 1: ...Electro Optical Modulators...

Page 2: ...10 2 1 OPTICAL INTERFACES 10 2 1 ELECTRICAL INTERFACES 12 2 2 MAXIMUM RATINGS 14 3 MEASUREMENT PARAMETERS 15 3 1 INSERTION LOSS IL 15 3 2 STATIC EXTINCTION RATIO SER 18 3 3 HALF WAVE VOLTAGE V AT LOW...

Page 3: ...al Ref Ed 0 08 02 2021 3 Handling instructions 1 1 Unpacking steps 1 Put the blister pack on a flat surface to open it Fig 1 2 To open the blister pack either peel off or cut the orange label located...

Page 4: ...EOMs Operating Manual Ref Ed 0 08 02 2021 4 Fig 3 3 To open the blister pack you can use the notches on the front Fig 4...

Page 5: ...EOMs Operating Manual Ref Ed 0 08 02 2021 5 Fig 5 4 Delicately remove the do not pull here labels and place them on another part of the blister pack Fig 6...

Page 6: ...8 02 2021 6 Fig 7 5 Remove the optical connectors and take the fibers out of their tray Lift and hold the modulator by its housing Delicately pull it out paying attention to the optical fibers electri...

Page 7: ...EOMs Operating Manual Ref Ed 0 08 02 2021 7 Fig 9 Fig 10...

Page 8: ...EOMs Operating Manual Ref Ed 0 08 02 2021 8 Fig 11 Fig 12...

Page 9: ...it Remember to keep the blister pack if you need to store the modulator or send it back to us To pack the modulator repeat the previous unpacking steps from the end to the beginning Do not forget to...

Page 10: ...for cleaning optical connector we recommend using Whatman lens cleaning tissue Grade 105 wetted with IPA Clean RF connector with dry air before mating and use a torque wrench for tightening 2 1 Optica...

Page 11: ...commended at the input If a SM fiber non PM is used one must use a polarization controller to obtain the desired light orientation at the input of the modulator chip Output Fiber This will depend on y...

Page 12: ...tible to mate with SMA 3 5 mm connectors 2 4 mm female compatible to mate with V 1 85 mm connectors 1 85 mm V type female RF microwave coaxial connector 2 DC port where a DC bias is applied to set the...

Page 13: ...essary we recommend the use of a 0 5 to 0 8 mm diameter copper wire previously stripped and wrapped around the pin Then solder the wire to the pin with a 330 C to 350 C soldering iron equipped with a...

Page 14: ...the package could be damaged We recommend unpacking or packing EOM in an Electrostatic Protected Area EPA Applying a transient overvoltage or any voltage above the specified maximum may cause a perma...

Page 15: ...3 1 Insertion Loss IL The insertion loss is defined by the difference between the modulator s input and output optical power dBm The following sections describe the measurement set up when the modulat...

Page 16: ...al element connectors mating sleeve we estimate that the excess optical losses are as following FC APC 1550 nm IL 0 25 dB per connector FC APC 1060 nm IL 0 4 dB per connector FC APC 850 nm IL 0 5 dB p...

Page 17: ...2 2 Intensity EOM max transmission measurement Pout Fig 24 3 1 2 3 Phase EOM transmission measurement Pout Fig 25 Cut back advantage avoid uncertainty induced by optical connectors mating sleeves but...

Page 18: ...extinction ratio is defined as the maximum dynamic between the optical ON state and OFF state at the output of the intensity modulator Intensity Modulator Transfer Function Fig 26 3 2 1 EOM MAXIMUM T...

Page 19: ...TRANSMISSION MEASUREMENT PMIN Fig 28 Note The DC voltage applied to adjust Pmin can be positive or negative We recommend selecting the voltage corresponding to Pmin that is closest to zero in order to...

Page 20: ...shift on the optical wave With the intensity modulator which is a two wave interferometer it corresponds to the driving voltage necessary to vary the optical output from the maximum of power to the mi...

Page 21: ...8 02 2021 21 3 3 2 V RF MEASUREMENT SET UP RF ELECTRICAL PORT 3 3 2 1 Intensity Modulator Fig 32 3 3 2 2 Phase Modulator Fig 33 Note Reference Phase EOM DUT must have similar insertion losses to recre...

Page 22: ...um Niobate modulator a perfect phase modulation is true in theory but also yields to undesired side effects Indeed the optical phase modulation yields a very weak optical amplitude modulation The resi...

Page 23: ...he modulator s best electro optical efficiency is obtained when the light is linearly polarized along the Z axis of the crystal TM polarized light for Z cut or TE polarized light for X cut Therefore i...

Page 24: ...is used The use of such a light source ensures a stable PER measurement Fig 38 PER is read directly on the PER meter rotating polarizer A narrow linewidth laser such as a DBF can also be used to measu...

Page 25: ...anufacturers propose mating sleeves with a better mechanical tolerance for high PER applications 3 6 Polarization Dependent Loss PDL The PDL is the optical loss difference dB between the two main pola...

Page 26: ...ation state with a polarization controller 3 7 Electrical return loss S11 electro optical bandwidth S21 The high frequency efficiency of the RF port is generally given by the electrical return loss an...

Page 27: ...EOMs Operating Manual Ref Ed 0 08 02 2021 27 DC is adjusted to reach quad transmission small signal to linearity slope of MTF Fig 42 Fig 43 Electro optical bandwith S21 Electrical r flexion S11...

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