An optical semiconductor package includes an optical semiconductor device, a temperature detection unit, and a temperature control unit (46) including a support member (46S), the optical semiconductor device and the temperature detection unit being arranged such that a temperature of a portion (P44) of a surface of the support member (46S) where the optical semiconductor device is arranged and a temperature of a portion (P45) of the surface of the support member (46S) where the temperature detection unit is arranged are substantially in thermal equilibrium with each other.
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