Optical waveguides – With optical coupler – Input/output coupler
Patent
1991-06-21
1993-01-19
Healy, Brian
Optical waveguides
With optical coupler
Input/output coupler
385 34, 385 51, 385 93, 359152, 359173, 156 60, 156158, G02B 632, G02F 100, B31B 160
Patent
active
051812649
ABSTRACT:
A circuit arrangement is provided for allowing the bidirectional exchange of received and transmitted signals over a single monomodal optical fiber. The light transmitter (usually a laser or a LED), the receiver of optical signals and an optical system suitable for directing the optical signal to be transmitted to the monomodal optical fiber ad for directing the optical signal from the monomodal optical fiber to the receiver collects the signals in one passage. The optical system uses an optical transceiver employing a light transmitter and a light receiver. This optical transceiver is formed in a unitary housing. The optical system includes first and second lenses which may be graded-index waveguide sections and a planar filter disposed therebetween, the planar filter typically being an interferential filter. The optical system is formed on a support which allows the light transmitter which is typically a laser to be disposed directly adjacent one of the lenses. The surface of the lens abutting the optical communication fiber and optical stub is angled with respect to perpendicular to the axis of the symmetry of the optical system to prevent reflected optical power from entering the light transmitter, particularly when it is a laser, hereby reducing noise and instability within the laser source.
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Blandano Francesco
Chiaretti Guido
Healy Brian
Italtel Societa Italiana Telecomunicazioni S.p.A.
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