Wavelength division multiplexing device with passive alignment substrate

A method of making a wavelength division multiplexing device including a plurality of collimating lenses each having a collimator optical axis aligned with a designed optical path, the method comprising:

• providing an alignment substrate having a plurality of aligners, each of the plurality of aligners configured to receive a respective collimating lens of the plurality of collimating lenses such that when the respective collimating lens is received in a respective aligner, the collimator optical axis is aligned with the designed optical path;
• placing each of the plurality of collimating lenses in a respective aligner of the plurality of aligners, wherein each collimating lens of the plurality of collimating lenses includes an abutment and each aligner of the plurality of aligners includes a stop;
• and
• abutting the abutment of the respective collimating lens with the stop of the respective aligner, wherein abutting the abutment with the stop positions the respective collimating lens along the designed optical path, wherein, for each of the plurality of collimating lenses, the abutment is provided at an end of the respective collimating lens which is configured to be coupled to an optical fiber.

A method of making a wavelength division multiplexing device including a plurality of collimating lenses each having a collimator optical axis aligned with a designed optical path, the method comprising:

• providing an alignment substrate having a plurality of aligners, each of the plurality of aligners configured to receive a respective collimating lens of the plurality of collimating lenses;
• placing each of the plurality of collimating lenses in a respective aligner of the plurality of aligners, wherein each collimating lens of the plurality of collimating lenses includes an abutment and each aligner of the plurality of aligners includes a stop;
• and
• abutting the abutment of the respective collimating lens with the stop of the respective aligner, wherein abutting the abutment with the stop positions the respective collimating lens along the designed optical path,
• wherein, for each of the plurality of collimating lenses, the abutment is provided at an end of the respective collimating lens which is configured to be coupled to an optical fiber.