a. a demultiplexer sub-assembly, comprising:

i. a filter block sub-assembly for separating the plurality of signals of different wavelengths, comprising:

A. a glass spacer, the glass spacer introducing different path delays in the transmission of each of the plurality of signals of different wavelengths;

B. a reflector, the reflector reflecting the optical signal received from the glass spacer back into the glass spacer; and

C. a plurality of filters, each of the plurality of filters filtering one of the plurality of signals of different wavelengths, wherein a first of the plurality of filters is co-axially aligned with a path of the optical signal and transmits one of the plurality of signals substantially without deviation; and

ii. a housing for housing the filter block sub-assembly, wherein the housing comprises:

a. a receptacle bore with a collimating lens, the collimating lens collimating the optical signal into the filter block sub-assembly;

b. a pocket for holding the filter-block assembly; and

c. an array of lenses, the array of lenses focusing the plurality of signals of different wavelengths received from the filter block sub-assembly onto the receiver sub-assembly, wherein a first lens of the array of lenses is co-axial with the receptacle bore and receives the one of the

plurality of signals transmitted by the first filter, wherein the housing is plastic that is molded in a single shot molding process such that at least the filter block sub-assembly or a pocket for the filter block sub-assembly, a receptacle bore and collimating lens, and the array of lenses are contained in two opposing sides of a single shot mold providing optical alignment for the optical receiver assembly; and

b. a multi-channel receiver optical sub-assembly mounted to the housing for interpreting the plurality of signals of different wavelengths, wherein the plurality of signals of different wavelengths are received from the demultiplexer sub-assembly.