Abstract: An optical transceiver circuit pack in which specialized components, i.e., optical components associated with transmitting and receiving at a first wavelength or first band of wavelengths, are arranged on a first optical transceiver card section constituting a first module, and wherein generic components, i.e., electronic components which are arranged and operable to electrically interact with any first module regardless of its particular wavelength or band of wavelengths, are arranged on a second optical transceiver card section constituting a second module, the respective modules being detachably coupled to one another such that the first module may be replaced with either an identical module (i.e., one being configured to transmit and receive at said first wavelength or first band of wavelengths) or a different module (i.e., one being configured to transmit at a wavelength or band of wavelengths different than said first wavelength or first band of wavelengths.