Why the feedback network is necessary in this optical amplifier ? How the circuit would work without the feedback photodiode ?

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    \$\begingroup\$ How do opamps in circuits without (negative) feedback generally behave? In the circuit imagine that the left FD (sensing photo diode) is gone, what would the output of opamp A1 do depending on Ui? \$\endgroup\$ – Bimpelrekkie Jan 30 at 9:53

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