Optical waveguides – Integrated optical circuit
Patent
1992-04-10
1993-03-02
Healy, Brian
Optical waveguides
Integrated optical circuit
385 18, 385 37, 385 47, 385132, 359128, 359130, 359333, 359346, 372 7, 372 50, 372 99, 372102, G02B 612, G02F 100, H01S 319
Patent
active
051916258
ABSTRACT:
An optical terminal has optical waveguides, 3-dB couplers, laser diodes, laser diodes provided with gratings, and connections on a substrate made of semiconductor material. The grating laser diodes have an external cavity which is formed by the waveguides and delimited by mirrors. Each of the laser diodes has a respective electrical connection through which the diodes can be switched between a light-absorbing mode, a light-amplifying mode, and a light-emitting mode, with the aid of electric current signals, and the diodes are also able to detect a light signal. The terminal can perform a number of functions. A light signal can be received, detected, amplified, and further transmitted. A narrow band light signal of desired wavelength can be generated within a broad wavelength area through the grating diodes in the cavity, and amplified and further transmitted. A light signal received having a plurality of wavelengths can amplify and detect a selected one of the wavelengths through the laser diodes in the cavity. Coherent reception of a light signal can be performed and a phase-modulated light signal can be transmitted.
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Healy Brian
Telefonaktiebolaget L M Ericsson
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