Abstract: A new low-cost, highly reliable and compact optical power monitor is manufactured with simplified structure and improved configurations that require only lateral position adjustment for input/output beam alignment. A compact size is achieved by employing prefabricated housing containing a highly effective focus lens placed at fixed position relative to an optical sensor, e.g., a photodiode. The prefabricated housing further function as a seal housing for direct plugging into a holding tube fitting seamlessly to a GRIN lens to focus the tapped collimated beam to the photo sensor thus greatly simplify the manufacturing processes without alignment requirements. Thermal stability and reliable performance is achieved by applying multiple-layered optical reflection-transmission coating directly onto the end surface of a GRIN lens for tapping a small portion of the collimated beam onto the focus lens and the photo sensor.

Abstract: A new low-cost, highly reliable and compact optical parametric signal monitor is manufactured with simplified structure and improved configurations that require only lateral position adjustment for input/output beam alignment. A compact size is achieved by employing an integration of beam collimator, signal splitter, and wavelength selector. Thermal stability and reliable performance is achieved by applying multiple-layered optical reflection-transmission coating directly onto the end surface of a GRIN lens for tapping a small portion of the collimated beam onto the focus lens and the photo sensor. The insertion loss can be conveniently minimized by laterally shifting the relative position of a dual fiber ferrule and the GRIN lens without complicate angular adjustments. Optical parameters can be monitored with a simple attachment of a wavelength selective element between signal tapping unit and signal detector.

Abstract: A new low-cost, highly reliable and compact optical power monitor is manufactured with simplified structure and improved configurations that require only lateral position adjustment for input/output beam alignment. A compact size is achieved by employing prefabricated housing containing a highly effective focus lens placed at fixed position relative to an optical sensor, e.g., a photodiode. The prefabricated housing further function as a seal housing for direct plugging into a holding tube fitting seamlessly to a GRIN lens to focus the tapped collimated beam to the photo sensor thus greatly simplify the manufacturing processes without alignment requirements. Thermal stability and reliable performance is achieved by applying multiple-layered optical reflection-transmission coating directly onto the end surface of a GRIN lens for tapping a small portion of the collimated beam onto the focus lens and the photo sensor.

Abstract: The design and apparatus constitutes the present invention allows for accurate analysis of optical signal quality such as wavelength, signal power and optical signal to noise ratio (OSNR) in ITU wavelength based dense wavelength division multiplexing fiber optical transmission system by using a optical tunable filter, a wavelength self-referencing system and a multi-channel optical power attenuation filter and detecting simultaneously or successively signal and noise separately in routing signal into one detection arm and noise into a signal attenuated detection arm. The tunable filter can be either a transmissive or a reflective device, which can be tuned across the wavelength band by way of control signal. The present invention advantageously supply a technique to measure accurately the optical signal power and optical noise level.

Abstract: A new low-cost, highly reliable and compact optical module is designed and manufactured with simplified structure and improved configurations by assembling multiple optical components onto a preformed platform. The platform includes a plurality of placement hollow-opening for placing and supporting the optical components on the platform at substantially predefined fixed position and orientation.