Technology Offer of TU Berlin

Mode coupled Semiconductor Laser with Feedback as an Optoelectronic Oscillator

Patent #13019/TUB
Background
For wireless communications, high-resolution short-range radar systems and especially clocks in optical communication networks, electrical signals of GHz values with two to three-digits are used more and more. The requirements for their usage as clocks yield enormous challenges, particularly for matching the bit rate of electrical and optical signals.
Technical Description
The invention presented here tackles this problem. For this purpose the source of the optical clock signal is a monolithic integrated mode coupled semiconductor laser. He consists of a gaining section, producing photons by sufficiently high applied voltages, which are getting absorbed in the absorption section and thus inducing an electron hole pair. Just after a short recovery period, new pairs can get induced and the electric resistor can therefore be modulated. A coupling of the amplification and the saturable absorption leads to the formation of pulses in the cavity. An optical feedback loop takes part of the radiation back into the laser. The comb-like laser pulses (urpulse) are affected by temporally jitter, which gets decisively reduced by the invention.
Possible Applications
Wireless communications, high-resolution short-range radar systems, clocks in optical communication networks
Comparison of the emitted pulse with and without an optical feedback.
Benefits
  1. Values of jitter 5 times smaller than with state of the art
  2. Length of the feedback loop can be constant or variable
  3. Output of optical and/or electrical pulses possible
Technology Readiness Level Small scale prototype (TRL: 4)
Property Rights
approved: US, FR, EP, CH, DE
Patent Holder
Technische Universit├Ąt Berlin
Possible Cooperation
  • R&D Cooperation
  • Patent Purchase
  • Licensing
Contact Details
Ina Kr├╝gerTechnology Transfer Manager
+49 (0)30 314-75916ina.krueger@tu-berlin.de
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