[PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS]re.kr (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS]re.kr (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [EMAIL_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [EMAIL_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS] (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; [EMAIL_ADDRESS] (W.K. ); [EMAIL_ADDRESS] (H.F.); [EMAIL_ADDRESS] (K.L. ); [PERSON]MAIL_ADDRESS]re.kr (S.H.) [PERSON]  
1 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea; kw1r0704@kaist. With the aim of providing a new light source for absolute positioning interferometry, mode-locked pulse lasers are being investigated to provide more efficient functionalities beyond continuous-wave lasers [8; 9; 10]. As a result, by making the most of the unique spectral and temporal characteristics of mode-locked lasers, various novel methods for absolute positioning have so far been demonstrated; they are conveniently referred to as synthetic wavelength interferometry [11; 12], spectral-resolved interferometry [13; 14], dual-comb interferometry [15; 16], optical cross-correlation [17; 18] and multi-wavelength interferometry [19; 20]. Each method has its own capability of utilizing mode-locked lasers as an alternative source for absolute positioning, and particularly the method of synthetic wavelength interferometry draws attention as it utilizes microwaves that are photonically synthesized directly from the pulse repetition rate of a mode-locked laser. Compared with conventional microwaves that are electrically generated by means of intensity or frequency modulation, the photonic microwaves offer superior stability in frequency and intensity so as to implement long-distance ranging with high precision.