Title :
Single-mode fiber WDM unit for duplex subscriber link using a substrate with embossed alignment grooves
Author :
Hillerich, Bernd ; Rode, Manfred ; Gottsmann, Hartmut
Author_Institution :
AEG AG, Ulm, West Germany
fDate :
11/1/1989 12:00:00 AM
Abstract :
A wavelength division multiplexing (WDM) unit for single-mode fiber (SMF) duplex transmission, with light source, photodiode (PD), and WDM coupler arranged on a common substrate, is described. Using a tolerant optical design, the optical elements, e.g. lenses and fibers, are positioned in embossed high-precision V grooves without active adjustments. Only the light source, a laser diode (LD) or an edge-emitting LED (ELED), must be aligned for optimum coupling and fixed by laser welding. Typical values of LD-to-fiber and fiber-to-PD coupling loss and crosstalk are 5 dB, 1.2 dB, and -44 dB, respectively. Hence, in spite of the potentially low-cost design, the optical performance of the device is virtually competitive with separated transmitter and receiver units
Keywords :
frequency division multiplexing; multiplexing equipment; optical communication equipment; optical fibres; optical links; subscriber loops; 1.2 dB; 5 dB; WDM coupler; WDM unit; coupling loss; crosstalk; duplex subscriber link; edge-emitting LED; embossed alignment grooves; laser diode; laser welding; lenses; light source; optical elements; optical performance; photodiode; single-mode fiber; substrate; wavelength division multiplexing; Lenses; Light sources; Optical coupling; Optical crosstalk; Optical design; Optical fiber couplers; Optical receivers; Optical transmitters; Photodiodes; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
