First Demonstration of TE Mode Nonreciprocal Propagation in an InGaAsP/InP Active Waveguide for an Integratable Optical Isolator

High Temperature Ferromagnetism and Nano-Scale Phase Separations in Diluted Magnetic Semiconductors and Oxides

“…The development of such spin injectors brings us closer to the realization of spin transistors and stable surface emitting lasers [4]. At the same time, spin-dependent boundary conditions and/or stray fields of the ferromagnet can affect magnetotransport and magnetooptical properties of the semiconductor, a phenomenon exploited in novel optical isolators [5,6]. Particularly perspective materials in the context of hybrid structures appear to be those elemental or compound ferromagnets which can be grown in the same reactor as the semiconductor counterpart.…”

Monolithic Integration of Semiconductor Waveguide Optical Isolators with Distributed Feedback Laser Diodes

“…2 (Takenaka & Nakano, 1999, Zaets & Ando, 1999. Discrete TE mode semiconductor active waveguide optical isolators have been reported in previous papers [Shimizu & Nakano, 2004. In TE mode semiconductor active waveguide optical isolators of Fig.…”

“…In our TE mode semiconductor active waveguide optical isolators, ferromagnetic metal (Fe) at one of the waveguide sidewalls provides the TE mode nonreciprocal loss, that is, larger propagation loss for backward traveling light than forward traveling light. The gain of the semiconductor optical amplifier (SOA) compensates the forward propagation loss by the ferromagnetic metal (Shimizu & Nakano, 2004. Fig.…”

“…Also, such nonreciprocal semiconductor waveguide devices could enable flexible design and robust operation of photonic integrated circuits. To overcome these challenges, we have demonstrated monolithically integrable transverse electric (TE) and transverse magnetic (TM) mode semiconductor active waveguide optical isolators based on the nonreciprocal loss (Shimizu & Nakano, 2004, Amemiya et al, 2006, and reported 14.7dB/mm optical isolation at λ=1550nm . In this chapter, we report monolithic integration of a semiconductor active waveguide optical isolator with distributed feedback laser diode (DFB LDs).…”

Single Mode Operation of 1.5-µm Waveguide Optical Isolators Based on the Nonreciprocal-loss Phenomenon

“…The other strategy to make waveguide isolators is to use asymmetric magneto-optic effects that occur in semiconductor waveguides combined with magnetic material. Leading examples are the nonreciprocal-phase-shift isolator [17][18][19][20] and the nonreciprocal-loss isolator [21][22][23][24][25][26]. The nonreciprocal-loss isolator uses no rare-earth garnet, so it is very compatible with standard semiconductor manufacturing processes.…”