Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-08-31
1991-02-19
Ullah, Akm
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455610, 372108, 350 9616, G02B 626, G02B 642, H01S 319, G02F 100
Patent
active
049937987
ABSTRACT:
A laser arrangement in an optical communication system has a semiconductor laser (1) which includes an optical waveguide (4) whose end surface (5,8) have reflection-inhibiting coatings. The end surfaces (5, 8) are connected to a respective first connection (7, 10) of a first (2) and a second (3) directional coupler switch. Each of the directional coupler switches (2,3) have a second connection (13, 14), which is provided with mirrors (15, 16), and a third connection (11,12), which is connected to a respective optical fiber (17, 18) in the communication system. In a receiving and amplifying state, an incoming light signal (P1) is coupled by the first coupler switch (2) to the laser diode (1), where the signal is amplified by a drive current (I) and detected (24). The amplified signal (P2) is coupled to the outgoing fiber (18) by the second coupler switch (3). In a light generating state, the first directional coupler switch (2) is in its cross state and the second directional coupler switch (3) is in an intermediate state, between its two terminal states, so that the mirrors (15, 16) define a cavity which includes the laser diode (1). By modulating the drive current (I) around the lasering threshold, a signal can be transmitted on the outgoing fiber (18). Alternatively, the laser arrangement can be modulated with the aid of the directional coupler switches (2,3) for the purpose of transmitting the signal.
REFERENCES:
patent: 4143940 (1979-03-01), Khoe
patent: 4798429 (1989-01-01), Djupsjobacka
patent: 4831631 (1989-05-01), Haeussler et al.
Telefonaktiebolaget L M Ericsson
Ullah Akm
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