Compact multiplexing/demultiplexing modules

A method for configuring an optical device, the method comprising:

• placing an array of filters on a substrate, each having a designated spectral response to transmit only a predetermined wavelength and reflect other wavelengths;
• aligning an array of collimators with the filters, each of the filters corresponding to one collimator in the array of collimators and transmitting the predetermined wavelength to the collimator;
• sliding two wedges respectively towards the collimator till respective contacts between the two wedges and the collimator are established;
• and
• applying a small amount of bonding agent to the respective contacts to bonding the collimator and the wedges so that aligned positions of the collimator are secured.

An optical device comprising:

• a substrate;
• a first and a second array of filters, each of the filters having a designated and distinct spectral response to transmit only a predetermined wavelength and reflect other wavelengths,
• a first and a second array of collimators, each aligned respectively with one of the filters and bonded via one or more wedges to the substrate, and
• wherein a multiplexed signal come into one of the filters in the first array that transmits a first predetermined wavelength in the multiplexed signal to one of the collimators in the first array and reflects the other wavelengths in the multiplexed signal to one of the filters in the second array that transmits a second predetermined wavelength in the multiplexed signal to one of the collimators in the second array.