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公开(公告)号：US10693275B2
公开(公告)日：2020-06-23
申请号：US15671231
申请日：2017-08-08
Applicant: Nokia Solutions and Networks OY
Inventor： Po Dong , Guilhem De Valicourt
Abstract: A directly modulated semiconductor laser whose optical output can be modulated by varying the transmittance of an end reflector of the laser cavity. In an example embodiment, the end reflector can be implemented using a lightwave circuit in which optical waveguides are arranged to form an optical interferometer. At least one of the optical waveguides may include a waveguide section configured to modulate the phase of an optical beam passing therethrough in response to an electrical radio-frequency drive signal in a manner that causes the transmittance and reflectance of the end reflector to be modulated accordingly. Advantageously, relatively high (e.g., >10 GHz) phase and/or amplitude modulation speeds of the optical output can be achieved in this manner to circumvent the inherent modulation-speed limitations of the laser's gain medium.
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公开(公告)号：US20190155064A1
公开(公告)日：2019-05-23
申请号：US15818998
申请日：2017-11-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Maarten Huberdina Pascal Tytgat , Guilhem De Valicourt , Sian Chong Jeffrey Lee , Michael Scott Eggleston
Abstract: A dual-drive push-pull Mach-Zehnder modulator is provided that suppresses electrical common-mode signal components using differential input in order to mitigate parasitic phase shift effects. The modulator is configured with at least two phase shifting sections with each having a respective set of diodes. Drive signals for each phase shifter are swapped by swapping two waveguide arms in which the first and second set of diodes are constructed in a particular configuration such that the electric field applied by each drive signal in the second set of diodes is the negative of what such signal was in the first set of set of diodes. As the input optical signal propagates through the first waveguide arm and the second waveguide arm, each arm independently modulates the phase which are then re-combined to provide an optical output signal with at least one suppressed signal component.
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公开(公告)号：US10295847B1
公开(公告)日：2019-05-21
申请号：US15818998
申请日：2017-11-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Maarten Huberdina Pascal Tytgat , Guilhem De Valicourt , Sian Chong Jeffrey Lee , Michael Scott Eggleston
Abstract: A dual-drive push-pull Mach-Zehnder modulator is provided that suppresses electrical common-mode signal components using differential input in order to mitigate parasitic phase shift effects. The modulator is configured with at least two phase shifting sections with each having a respective set of diodes. Drive signals for each phase shifter are swapped by swapping two waveguide arms in which the first and second set of diodes are constructed in a particular configuration such that the electric field applied by each drive signal in the second set of diodes is the negative of what such signal was in the first set of set of diodes. As the input optical signal propagates through the first waveguide arm and the second waveguide arm, each arm independently modulates the phase which are then re-combined to provide an optical output signal with at least one suppressed signal component.
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公开(公告)号：US20190052044A1
公开(公告)日：2019-02-14
申请号：US15671231
申请日：2017-08-08
Applicant: Nokia Solutions and Networks OY
Inventor： Po Dong , Guilhem De Valicourt
Abstract: A directly modulated semiconductor laser whose optical output can be modulated by varying the transmittance of an end reflector of the laser cavity. In an example embodiment, the end reflector can be implemented using a lightwave circuit in which optical waveguides are arranged to form an optical interferometer. At least one of the optical waveguides may include a waveguide section configured to modulate the phase of an optical beam passing therethrough in response to an electrical radio-frequency drive signal in a manner that causes the transmittance and reflectance of the end reflector to be modulated accordingly. Advantageously, relatively high (e.g., >10 GHz) phase and/or amplitude modulation speeds of the optical output can be achieved in this manner to circumvent the inherent modulation-speed limitations of the laser's gain medium.
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