Generation of Multiple Optical Frequencies from the Frequency Comb for Optical Communication

Byung Jae Chun, Kang Hj, Seung‐Woo Kim +1 more

Matthew Pysher, Yoshichika Miwa, Reihaneh Shahrokhshahi +2 more

Byung Jae Chun, Hyun Jay Kang, Young‐Jin Kim +1 more

Generating multiple optical frequencies referenced to the frequency standard is an important task in optical clock dissemination and optical communication. An apparatus for frequency-comb-referenced generation of multiple optical frequencies is demonstrated for high-precision free-space transfer of multiple optical frequencies. The relative linewidth and frequency instability at each channel corresponds to sub-1 Hz and 1.06×10-15 at 10 s averaging time, respectively. During the free-space transfer, the refractive index change of transmission media caused by atmospheric turbulences induces phase and frequency noise on optical frequencies. These phase and frequency noise causes induced linewidth broadening and frequency shift in optical frequencies which can disturb the accurate frequency transfer. The proposed feedback loop with acousto-optic modulator can monitor and compensate phase/frequency noise on optical frequencies. As a result, a frequency-comb-referenced single optical mode is compensated with a high signal to noise ratio (SNR) of 80 dB. By sharing the same optical paths, this feedback loop is confirmed to be successfully transferred to the neighboring wavelength channels (a 100 GHz spaced channel). This result confirms our proposed system can transfer optical frequencies to the remote site in free-space without performance degradation.

강현재, 천병재, K Lee +3 more

Christian Reimer, Michael Kues, Piotr Roztocki +9 more

Complex optical photon states with entanglement shared among several modes are critical to improving our fundamental understanding of quantum mechanics and have applications for quantum information processing, imaging, and microscopy. We demonstrate that optical integrated Kerr frequency combs can be used to generate several bi- and multiphoton entangled qubits, with direct applications for quantum communication and computation. Our method is compatible with contemporary fiber and quantum memory infrastructures and with chip-scale semiconductor technology, enabling compact, low-cost, and scalable implementations. The exploitation of integrated Kerr frequency combs, with their ability to generate multiple, customizable, and complex quantum states, can provide a scalable, practical, and compact platform for quantum technologies.

Takashi Yamamoto

Quantum frequency comb is a useful resource for the preparation of multi-dimensional photonic quantum states and frequency multiplexed photon pairs. Recently, based on a quadratic nonlinear optical waveguide inside a cavity, we demonstrated an efficient and wide-range generation of the quantum frequency comb. Due to the singly resonant configuration, the frequency comb is observed continuously over 80 nm at the telecom band, apart from the conventional multiple resonant configurations. We will present our recent progress on the quantum frequency comb generation.