We have developed a novel InP-based, ridge-waveguide photonic integrated circuit (PIC), which consists of a 1.1-um
wavelength Y-branch optical waveguide with low loss and improved far field pattern and a 1.3-um wavelength strained
InGaAsP-InP multiple quantum-well superluminescent diode, with bundle integrated guide (BIG) as the scheme for
monolithic integration. The simulations of BIG and Y-branches show low losses and improved far-field patterns, based
on the beam propagation method (BPM). The amplified spontaneous emission of the device is up to 10 mW at 120 mA
with no threshold and saturation. Spectral characteristics of about 30 nm width and less than 1 dB modulation are
achieved using the built-in anti-lasing ability of Y-branch. The beam divergence angles in horizontal and vertical
directions are optimized to as small as 12°×8°, resulting in good fiber coupling. The compactness, simplicity in
fabrication, good superluminescent performance, low transmission loss and estimated low coupling loss prove the BIG
and Y-branch method to be a feasible way for integration and make the photonic integrated circuit of Y-branch and
superluminescent diode an promising candidate for transmitter and transceiver used in fiber optic gyroscope.
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