The clock recovery device (100) is adapted to recover at least one clock signal (SCLK,A ) from an optical input signal (SIN), said input signal 5 (SIN) comprising one or more data signals (SIN,A, S IN,B). The clock recovery device (100) comprises a first waveguide (5), a first optical resonator (OR1) coupled to said first waveguide (5), a second optical resonator (OR2) coupled to said first waveguide (6), and a combiner (6) to combine signals (SREF,A, SSIDE,A ) provided by said first optical 10 resonator (OR1) and said second optical resonator (OR2) in order to provide an output signal (SOUT). A passband (PB) of said first optical resonator (OR1) is matched with a first spectral peak ( REF,A ) of said input signal (SIN), and a passband (PB) of said second optical resonator (OR2) is matched with a second spectral peak (SIDE,A ) of 15 said input signal (SIN) such that the spectral separation between said first and said second peaks is equal to a clock frequency (CLK,A ) associated with a first data signal (SIN,A ). The optical resonators (OR1, OR2) store optical energy and provide an output also when the data signal (SIN,A ) is zero. Thus, the output signal (SOUT) comprises a first 20 recovered clock signal (SCLK,A ) which exhibits continuous beat at said first clock frequency ( CLK,A ). The optical resonators (OR1, OR2) are coupled to the same waveguide (5) by evanescent coupling. A high coupling efficiency may be achieved and the use of further optical splitters may be avoided.
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