Optical modulator wavelength dependency

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Using wavelengths other than 1550 nm with lithium niobate electro-optic Mach-Zehnder modulators can lead to increased loss, particularly with shorter wavelengths, which may not be covered under warranty. The LN05S modulator is optimized for 1550 nm and features a low RF drive voltage and a fixed chirp coefficient, making it suitable for various data formats. However, if operated outside the specified wavelength range, users may experience temporary performance degradation that can be mitigated by heating the modulator. Another manufacturer indicates a wavelength-dependent loss of less than 1 dB within the 1520-1620 nm range. Overall, adherence to the recommended wavelength is crucial for maintaining optimal performance and reliability.
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What is the effect of using other than 1550nm light with an (LiNbO3, lithium niobate) electro-optic Mach-Zehnder modulator?

Thanks!
 
Engineering news on Phys.org
"The LN05S intensity modulator with external DC bias is a high-performance 40 GHz (40 Gb/s) modulator that has a single-ended drive configuration with a fixed chirp coefficient of ±0.7 and an industry-leading low RF drive voltage (5.5 V). The LN05S has a Mach-Zehnder interferometric architecture with external DC bias, ideal for both NRZ and RZ data format solutions.

Note: The modulators are designed for use in the 1550 nm window. Using the modulators at another wavelength (e.g., visible light) may cause a temporary increase in loss that is not covered under warranty. For instance, the increase in loss caused by shorter wavelengths can be reversed by heating a modulator to 50 °C for an hour."
http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3948

A different manufacturer claims: Wavelength dependent loss 1520-1620 nm = <1dB
 

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