Electro-optic Film with Narrow Absorption Bandwidth for O-band Loss Reduction
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Solution Overview
Problem
Conventional electro-optic (EO) compounds and films experience significant optical loss in the O band region (1260-1360 nm), which hampers optical communication, especially as the EO coefficient increases.
Innovation Solution
The development of an electro-optic film using a compound with a specific structure, characterized by a dipole moment of 19 to 31 debye, a maximum absorption wavelength between 760 to 830 nm, and a long wavelength side half-value width of 90 to 120 nm, which effectively suppresses optical loss in the O band region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EO coefficient is increased by adopting a donor with high electron donating property and an acceptor with high electron withdrawing property, then the electro-optic effect is enhanced, but optical loss in the O band region increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dipole moment (19-31 debye), maximum absorption wavelength (760-830 nm), and long wavelength side half-value width (90-120 nm) of the EO compound. These parameter optimizations balance the electro-optic effect enhancement with optical loss suppression in the O band region, resolving the contradiction between improved electro-optic performance and reduced optical loss.
2Reliability
If the conjugate length of the n conjugated bridge is increased to increase the EO coefficient, then the electro-optic effect is enhanced, but optical loss in the O band region increases
Solution Approach 1:
The patent optimizes the conjugate length parameter by controlling the maximum absorption wavelength within 760-830 nm and the long wavelength side half-value width within 90-120 nm. This precise parameter control ensures that the conjugate length is extended enough to achieve high electro-optic effect while remaining short enough to avoid excessive optical loss in the O band region.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electro-optic film achieves a small optical loss α with respect to the electro-optic coefficient r33 in the O band region, making it suitable for optical communication in this wavelength range.
Implementation Method 1
An organic EO material has attracted attention from such a viewpoint. The organic EO material exhibits a large electro-optic effect as compared with the inorganic ferroelectric EO material, can operate at high speed
Implementation Method 2
a maximum absorption wavelength (λmax) is 760 to 830 nm, and a difference between the maximum absorption wavelength and an absorption wavelength on a longer wavelength side than the maximum absorption wavelength among absorption wavelengths exhibiting absorbance of a half value of maximum absorbance is 90 to 120 nm
Data Source
AI summary
Provided is an electro-optic film. The electro-optic film contains a compound (A) having a dipole moment of 19 to 31 debye. The electro-optic film has a maximum absorption wavelength (λ max) of 760 to 830 nm. A difference between the maximum absorption wavelength and an absorption wavelength on a longer wavelength side than the maximum absorption wavelength among absorption wavelengths exhibiting absorbance of a half value of maximum absorbance of the electro-optic film is 90 to 120 nm.