Dual drive LiNbO3 Mach Zehnder Modulator

[Dr. Dhiman Kakati]

Hello Everyone, I am looking for some specification regarding Dual drive LiNbO3 Mach Zehnder Modulator, I am unable to find the cavity length of the interferometric structure.

Regards,
Dhiman

[Dr. Dhiman Kakati]

I would like to have a response from Optiwave side as i need a very exact answer for this. This will help me while modelling all the design I have simulated. Thanking you.

With Best Regards,
Dhiman

[Rajguru M. Mohan]

Hi, Dhiman,
Here is the link for LOW drive 40 gbps NRZ LiNbO3 Mach Zehnder Modulator
http://www.fujitsu.com/downloads/OPTCMP/lineup/40gln/40Glnnrz-catalog.pdf

The link for a dual-drive LiNbO3 architecture modulator with chirp
management is proposed and developed offering SFDR > 25 dB in a 1.4 V
bias excursion compared to only 0.5 V bias excursion in a conventional
Mach-Zehnder electro-optical modulator (MZ-EOM) as:
https://www.osapublishing.org/view_article.cfm?gotourl=https%3A%2F%2Fwww%2Eosapublishing%2Eorg%2FDirectPDFAccess%2FA6896A5A-99FC-C393-A184D8FC52BAE57F_224731%2Foe-19-26-B452%2Epdf%3Fda%3D1%26id%3D224731%26seq%3D0%26mobile%3Dno&org=
http://www.ncbi.nlm.nih.gov/pubmed/22274055
http://www.shf.de/wp-content/uploads/appnotes/shf_tutorial_note_modulation_schemes.pdf
http://www.ece.queensu.ca/Current-Students/Undergraduate/Course-Homepages/ELEC-486/files/ELEC486_OptMod_Jan2013.pdf

Here you will find all specifications of different type Dual drive LiNbO3 Mach Zehnder Modulator.
Thanks

[Karan Ahuja]

Hi Dhiman.

I would like to mention that For high-speed communication (10 GBit/s and beyond) it becomes extremely difficult to modulate the laser directly, therefore external optical modulators are used. The electroabsorption modulator is such a modulator. It can be understood as a reverse-biased PIN detector. Although it improves the chirp performance considerably compared to direct modulation of the laser, there is still enough chirp to make long haul high speed transmission impossible. More importantly, the modulator chirp is dynamic and changes with the actual drive voltage. Another possibility to modulate light is a Mach Zehnder structure in a material showingstrong electro-optic effect (such as LiNbO3 or the 3-5 semiconductors such as GaAs andInP). By applying a voltage the optical signal in each path is phase modulated as the optical path length is altered by the electric field. Combining the two paths with different phase modulation converts the phase modulation into intensity modulation. If the phase modulation is exactly equal in each path but different in sign, the modulator is chirp free, this means the output is only intensity modulated without incidental phase-(or frequency-) modulation. One way of implementing a Mach Zehnder
modulator is a dual electrode structure or a push pull modulator: If we apply data and inverted data, the optical output will be chirp free, if we change the amplitudes of the driving signals the chirp can be adjusted. To obtain a chirp free signal the two drivers have to be very carefully matched (Option matched pairs for SHF amplifiers). The benefit of a push pull modulator compared to a single electrode modulator is that you need lower driving voltages in each arm. The drawback is that you need two amplifiers that are carefully matched and that it is difficult to quantify the chirp of such a configuration.
You may refer to this paper
https://www.osapublishing.org/view_article.cfm?gotourl=https%3A%2F%2Fwww%2Eosapublishing%2Eorg%2FDirectPDFAccess%2FA6896A5A-99FC-C393-A184D8FC52BAE57F_224731%2Foe-19-26-B452%2Epdf%3Fda%3D1%26id%3D224731%26seq%3D0%26mobile%3Dno&org=

[Karan Ahuja]

I want to add that A dual-drive LiNbO(3) architecture modulator with chirp management is proposed and developed offering SFDR > 25 dB in a 1.4 V bias excursion compared to only 0.5 V bias excursion in a conventional Mach-Zehnder electro-optical modulator (MZ-EOM). The architecture effectively extends the linear regime and enables the optical transmission of wireless systems employing orthogonal division multiplexing (OFDM) modulation such as ultra-wide band (UWB) which require high linearity over a broad frequency range due to their high peak-to-average power ratio (PARP). Radio-over-fiber UWB transmission in a passive optical network is experimentally demonstrated employing this technique, exhibiting an enhancement of 2.2 dB in EVM after 57 km SSMF when the dual-drive developed modulator is employed. Depending on your application you can choose between three transmitters: NRZ or NRZ, RZ and CS-RZ or a transmitter that supports six modulation formats: NRZ, RZ and CS-RZ and the three corresponding DPSK versions. As receivers we offer a photo receiver for NRZ, RZ and CS-RZ as well as a receiver for DPSK with built in decoder and a balanced detector. You may refer to this link.

http://www.ncbi.nlm.nih.gov/pubmed/22274055

Thanks

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