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A compact low noise single frequency linearly polarized distributed Bragg reflector (DBR) fiber laser based on a 1.4-cm-long homemade Er3+ /yb3+-codoped phosphate single mode glass fiber has been demonstrated.An over 50mW stable single frequency linearly polarized fiber laser was achieved.The measured slope efficiency is more than 21.6％,and the signal-to-noise ratio (SNR) is higher than 65dB and the laser linewidth is less than 2.0kHz.The laser RIN is measured to be less than -150 dB/Hz at the frequencies over 2.0 MHz,and the obtained linear polarization extinction ratio (LPER) is more than 30 dB.