| http://www.w3.org/ns/prov#value | - According to the above-described embodiments, a differential quadrature phase shift keying optical receiving circuit in which n=2 (M=4) is explained; however, the present invention should not be limited to this and the present invention may be applied to a differential M phase shift keying optical receiving circuit in which M=2n where n is an integer that is equal to or larger than 3.
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