A planar optical circuit with – at least one functional layer (11) with structures for guiding, change, regulating, controlling, generating and / or detection of optical signals, – a carrier substrate (10), on which the at least one functional layer (11) is formed, and – at least two spatially separate functional units (2, 3), the said at least one functional layer (11) on the carrier substrate (10) are formed, – the at least two functional units (2, 3) by at least one trench structure (4; 4 ''; 4 "; 4"'') in the at least one functional layer (11) and / or the carrier substrate (10) are separated from one another thermally, characterized by the, that the at least two functional units (2, 3) by about the trench structure (4; 4 ''; 4 "; 4"'') around the waveguide (5) of the planar optical circuit are connected to one another optically.
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