An apparatus for measuring optical power comprising: a first multiplexer/demultiplexer configured to split/combine an optical signal comprising a first wavelength and second wavelength between a first single fiber and a plurality of branches, wherein a first branch of the plurality of branches carries a first optical signal associated with the first wavelength in a first direction and a second branch of the plurality of branches carries a second optical signal associated with the second wavelength in a second direction that is opposite the first direction; a second multiplexer/demultiplexer configured to split/combine the optical signal comprising said first wavelength and said second wavelength between the plurality of branches and a second single fiber; a first tap photodetector in the first branch coupled to said first and second multiplexer/demultiplexers and to a first measurement device for measuring an optical power level of the first optical signal associated with the first wavelength; a second tap photodetector in the second branch coupled to said first and second multiplexer/demultiplexers and to a second measurement device for measuring an optical power level of the second optical signal associated with the second wavelength; a first bandpass filter integrated with the first tap photodetector or coupled, at one end thereof, to the first multiplexer/demultiplexer and, at another end thereof, to said first tap photodetector; and a second bandpass filter integrated with the second tap photodetector or coupled, at one end thereof, to the second multiplexer/demultiplexer and, at another end thereof, to said second tap photodetector. a first multiplexer/demultiplexer configured to split/combine an optical signal comprising a first wavelength and second wavelength between a first single fiber and a plurality of branches, wherein a first branch of the plurality of branches carries a first optical signal associated with the first wavelength in a first direction and a second branch of the plurality of branches carries a second optical signal associated with the second wavelength in a second direction that is opposite the first direction; a second multiplexer/demultiplexer configured to split/combine the optical signal comprising said first wavelength and said second wavelength between the plurality of branches and a second single fiber; a first tap photodetector in the first branch coupled to said first and second multiplexer/demultiplexers and to a first measurement device for measuring an optical power level of the first optical signal associated with the first wavelength; a second tap photodetector in the second branch coupled to said first and second multiplexer/demultiplexers and to a second measurement device for measuring an optical power level of the second optical signal associated with the second wavelength; a first bandpass filter integrated with the first tap photodetector or coupled, at one end thereof, to the first multiplexer/demultiplexer and, at another end thereof, to said first tap photodetector; and a second bandpass filter integrated with the second tap photodetector or coupled, at one end thereof, to the second multiplexer/demultiplexer and, at another end thereof, to said second tap photodetector.