In new generation aircraft like A320 Neo or B737 MAX the IRS system which is present is it based on (Ring Laser or Fibre Optics) gyros or they used Solid state MEMS like which our present in our smartphones and G1000 avionics?

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    $\begingroup$ The A320NEO and B737MAX are not new generation aircraft. They are re-engined last generation aircraft. Their IRS is the same as the A320 and 737NG. The newest generation aircraft are A350, B787 and B777X. $\endgroup$
    – Gerry

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