Abstract: An optoelectronic module includes an optical radiation source having associated an output transmission path for an output optical radiation generated by the source as well as an optical radiation detector having associated an input transmission path for an input optical radiation to be detected by said detector. The module includes, as an integral part thereof, a loop-back arrangement selectively activatable to cause the output optical radiation generated by the source to at least partly propagate from the output transmission path towards the input transmission path, whereby the optical radiation generated by the source is directed towards the optical detector (R) to be detected thereby.

Abstract: A system for converting a first and a second signal representative of payload and supervisory information, respectively, between an electrical format (PL, S) and a WDM optical format, includes: a first converter (L1, P1) for converting the first signal between the electrical format (P, L) and a first disaggregated optical format, a second converter (L2, P2) for converting the second signal between the electrical format (S) and a second disaggregated optical format, and an optical WDM converter (WDM-C, WDM-S) for converting the first and second signals between the aforesaid first and second disaggregated optical formats and the WDM aggregated optical format. The first converter (L1, P1), the second converter (L2, P2) and the optical WDM converter (WDM-C, WDM-S) are integrated to a single self-contained module (TM1, RM1). The arrangement is adapted to be implemented as a transmitter, a receiver as well as a transceiver module.

Abstract: An optoelectronic module includes an optical radiation source (T) having associated an output transmission path (V1, V2, C1) for an output optical radiation generated by the source (T) as well as an optical radiation detector (R) having associated an input transmission path (C2, V3, V4) for an input optical radiation to be detected by said detector (R). The module includes, as an integral part thereof, a loop-back arrangement (M1, M2; M12; VOA; OW) selectively activatable to cause the output optical radiation generated by the source (T) to at least partly propagate from the output transmission path (V1) towards the input transmission path (V4), whereby the optical radiation generated by the source (T) is directed towards the optical detector (R) to be detected thereby.

Abstract: An optoelectronic module includes a variable optical attenuator with further passive and active optical components to form an integrated module, which is inexpensive and yields small yet robust packages. The module provides for a variable output power and can be installed and replaced via a ‘hot pluggable’ connector.

Abstract: Known transceivers and transmitters for Dense Wavelength Division Multiplexing (DWDM) systems are typically formed from separately sourced components by a Network Equipment Manufacturer (NEM). Alternatively, transceivers or transmitters are formed as separate modules from separately sourced components by the NEM. Consequently, the NEM has to build the transmitters or transceivers. This construction is difficult, because known optical packages for housing optoelectronic components, such as laser diodes, comprise a fibre “pigtail” through which electromagnetic radiation leaves the optical package. The present invention overcomes this problem by providing a DWDM module apparatus (2) that comprises an optical package (10) for housing optoelectronic components, the optical package (10) comprising a first part of a coupling (12) attached thereto.